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Bài tập Toán lớp 5 Tính giá trị biểu thức chứa phân số có đáp án

3 câu · 10 phút · Ngân hàng đề TopStudy. Đáp án và lời giải do TopStudy biên soạn, mở ngay dưới từng câu.

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Phần I. Tự luận

Câu 1

1 điểm
(317+25)×14=(\frac{3}{{17}} + \frac{2}{5}) \times \frac{1}{4} =...(519−17):23=(\frac{5}{{19}} - \frac{1}{7}):\frac{2}{3} =...223×38+15=\frac{2}{{23}} \times \frac{3}{8} + \frac{1}{5} =...
425:29−16=\frac{4}{{25}}:\frac{2}{9} - \frac{1}{6} =...(729+310)×27=(\frac{7}{{29}} + \frac{3}{{10}}) \times \frac{2}{7} =...(521−213):34=(\frac{5}{{21}} - \frac{2}{{13}}):\frac{3}{4} =...
316×415+29=\frac{3}{{16}} \times \frac{4}{{15}} + \frac{2}{9} = ...23×(14+38)=\frac{2}{3} \times (\frac{1}{4} + \frac{3}{8}) =...36:(23−14)=\frac{3}{6}:(\frac{2}{3} - \frac{1}{4}) =...
18×(34−26)=\frac{1}{8} \times (\frac{3}{4} - \frac{2}{6}) =...46:(13+28)=\frac{4}{6}:(\frac{1}{3} + \frac{2}{8}) =...34×(29+16)=\frac{3}{4} \times (\frac{2}{9} + \frac{1}{6}) =...
28:(36−19)=\frac{2}{8}:(\frac{3}{6} - \frac{1}{9}) =...13×(48+24)=\frac{1}{3} \times (\frac{4}{8} + \frac{2}{4}) =...56:(24−18)=\frac{5}{6}:(\frac{2}{4} - \frac{1}{8}) =...
25×310:12=\frac{2}{5} \times \frac{3}{{10}}:\frac{1}{2} =...412:27×35=\frac{4}{{12}}:\frac{2}{7} \times \frac{3}{5} =...3×52:7=3 \times \frac{5}{2}:7 =...
12+13×25=\frac{1}{2} + \frac{1}{3} \times \frac{2}{5} =...34−12:23=\frac{3}{4} - \frac{1}{2}:\frac{2}{3} =...23×35+14=\frac{2}{3} \times \frac{3}{5} + \frac{1}{4} =...
56:23−13=\frac{5}{6}:\frac{2}{3} - \frac{1}{3} =...14+25:37=\frac{1}{4} + \frac{2}{5}:\frac{3}{7} =...38−14×23=\frac{3}{8} - \frac{1}{4} \times \frac{2}{3} =...
45×27+13=\frac{4}{5} \times \frac{2}{7} + \frac{1}{3} =...23:12−34=\frac{2}{3}:\frac{1}{2} - \frac{3}{4} =...16+34×25=\frac{1}{6} + \frac{3}{4} \times \frac{2}{5} =...
13×45+27=\frac{1}{3} \times \frac{4}{5} + \frac{2}{7} =...35:13−12=\frac{3}{5}:\frac{1}{3} - \frac{1}{2} =...25+14×38=\frac{2}{5} + \frac{1}{4} \times \frac{3}{8} =...
12×34+15=\frac{1}{2} \times \frac{3}{4} + \frac{1}{5} =...58:12−23=\frac{5}{8}:\frac{1}{2} - \frac{2}{3} =...37+23×14=\frac{3}{7} + \frac{2}{3} \times \frac{1}{4} =...
23×15+34=\frac{2}{3} \times \frac{1}{5} + \frac{3}{4} =...56:34−14=\frac{5}{6}:\frac{3}{4} - \frac{1}{4} =...14+27×35=\frac{1}{4} + \frac{2}{7} \times \frac{3}{5} =...
25×47+13=\frac{2}{5} \times \frac{4}{7} + \frac{1}{3} =...49:23−16=\frac{4}{9}:\frac{2}{3} - \frac{1}{6} =...15+38×27=\frac{1}{5} + \frac{3}{8} \times \frac{2}{7} =...
57−14:35=\frac{5}{7} - \frac{1}{4}:\frac{3}{5} =...35×23+14=\frac{3}{5} \times \frac{2}{3} + \frac{1}{4} =...23:15−37=\frac{2}{3}:\frac{1}{5} - \frac{3}{7} =...
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(317+25)×14=(1585+3485)×14=4985×14=49340\begin{array}{l}(\frac{3}{{17}} + \frac{2}{5}) \times \frac{1}{4}\\ = (\frac{{15}}{{85}} + \frac{{34}}{{85}}) \times \frac{1}{4}\\ = \frac{{49}}{{85}} \times \frac{1}{4} = \frac{{49}}{{340}}\end{array}(519−17):23=(35133−19133):23=16133:23=24133\begin{array}{l}(\frac{5}{{19}} - \frac{1}{7}):\frac{2}{3}\\ = (\frac{{35}}{{133}} - \frac{{19}}{{133}}):\frac{2}{3}\\ = \frac{{16}}{{133}}:\frac{2}{3} = \frac{{24}}{{133}}\end{array}223×38+15=392+15=15460+92460=107460\begin{array}{l}\frac{2}{{23}} \times \frac{3}{8} + \frac{1}{5}\\ = \frac{3}{{92}} + \frac{1}{5}\\ = \frac{{15}}{{460}} + \frac{{92}}{{460}} = \frac{{107}}{{460}}\end{array}
425:29−16=1825−16=108150−25150=83150\begin{array}{l}\frac{4}{{25}}:\frac{2}{9} - \frac{1}{6}\\ = \frac{{18}}{{25}} - \frac{1}{6}\\ = \frac{{108}}{{150}} - \frac{{25}}{{150}} = \frac{{83}}{{150}}\end{array}(729+310)×27=(70290+87290)×27=157290×27=3142030=1571015\begin{array}{l}(\frac{7}{{29}} + \frac{3}{{10}}) \times \frac{2}{7}\\ = (\frac{{70}}{{290}} + \frac{{87}}{{290}}) \times \frac{2}{7}\\ = \frac{{157}}{{290}} \times \frac{2}{7} = \frac{{314}}{{2030}} = \frac{{157}}{{1015}}\end{array}(521−213):34=(65273−42273):34=23273:34=92819\begin{array}{l}(\frac{5}{{21}} - \frac{2}{{13}}):\frac{3}{4}\\ = (\frac{{65}}{{273}} - \frac{{42}}{{273}}):\frac{3}{4}\\ = \frac{{23}}{{273}}:\frac{3}{4} = \frac{{92}}{{819}}\end{array}
316×415+29=12240+29=120+29=9180+40180=49180\begin{array}{l}\frac{3}{{16}} \times \frac{4}{{15}} + \frac{2}{9}\\ = \frac{{12}}{{240}} + \frac{2}{9}\\ = \frac{1}{{20}} + \frac{2}{9} = \frac{9}{{180}} + \frac{{40}}{{180}} = \frac{{49}}{{180}}\end{array}23×(14+38)=23×(28+38)=23×58=1024=512\begin{array}{l}\frac{2}{3} \times (\frac{1}{4} + \frac{3}{8})\\ = \frac{2}{3} \times (\frac{2}{8} + \frac{3}{8})\\ = \frac{2}{3} \times \frac{5}{8} = \frac{{10}}{{24}} = \frac{5}{{12}}\end{array}36:(23−14)=36:(812−312)=36:512=3630=65\begin{array}{l}\frac{3}{6}:(\frac{2}{3} - \frac{1}{4})\\ = \frac{3}{6}:(\frac{8}{{12}} - \frac{3}{{12}})\\ = \frac{3}{6}:\frac{5}{{12}} = \frac{{36}}{{30}} = \frac{6}{5}\end{array}
18×(34−26)=18×(912−412)=18×512=596\begin{array}{l}\frac{1}{8} \times (\frac{3}{4} - \frac{2}{6})\\ = \frac{1}{8} \times (\frac{9}{{12}} - \frac{4}{{12}})\\ = \frac{1}{8} \times \frac{5}{{12}} = \frac{5}{{96}}\end{array}46:(13+28)=46:(824+624)=46:1424=46:712=4842=87\begin{array}{l}\frac{4}{6}:(\frac{1}{3} + \frac{2}{8})\\ = \frac{4}{6}:(\frac{8}{{24}} + \frac{6}{{24}})\\ = \frac{4}{6}:\frac{{14}}{{24}} = \frac{4}{6}:\frac{7}{{12}} = \frac{{48}}{{42}} = \frac{8}{7}\end{array}34×(29+16)=34×(418+318)=34×718=2172=724\begin{array}{l}\frac{3}{4} \times (\frac{2}{9} + \frac{1}{6})\\ = \frac{3}{4} \times (\frac{4}{{18}} + \frac{3}{{18}})\\ = \frac{3}{4} \times \frac{7}{{18}} = \frac{{21}}{{72}} = \frac{7}{{24}}\end{array}
28:(36−19)=28:(918−218)=28:718=3656=914\begin{array}{l}\frac{2}{8}:(\frac{3}{6} - \frac{1}{9})\\ = \frac{2}{8}:(\frac{9}{{18}} - \frac{2}{{18}})\\ = \frac{2}{8}:\frac{7}{{18}} = \frac{{36}}{{56}} = \frac{9}{{14}}\end{array}13×(48+24)=13×(48+48)=13×88=13×1=13\begin{array}{l}\frac{1}{3} \times (\frac{4}{8} + \frac{2}{4})\\ = \frac{1}{3} \times (\frac{4}{8} + \frac{4}{8})\\ = \frac{1}{3} \times \frac{8}{8} = \frac{1}{3} \times 1 = \frac{1}{3}\end{array}56:(24−18)=56:(48−18)=56:38=4018=209\begin{array}{l}\frac{5}{6}:(\frac{2}{4} - \frac{1}{8})\\ = \frac{5}{6}:(\frac{4}{8} - \frac{1}{8})\\ = \frac{5}{6}:\frac{3}{8} = \frac{{40}}{{18}} = \frac{{20}}{9}\end{array}
25×310:12=650:12=325:12=625\begin{array}{l}\frac{2}{5} \times \frac{3}{{10}}:\frac{1}{2}\\ = \frac{6}{{50}}:\frac{1}{2} = \frac{3}{{25}}:\frac{1}{2} = \frac{6}{{25}}\end{array}412:27×35=2824×35=76×35=2130=710\begin{array}{l}\frac{4}{{12}}:\frac{2}{7} \times \frac{3}{5}\\ = \frac{{28}}{{24}} \times \frac{3}{5} = \frac{7}{6} \times \frac{3}{5} = \frac{{21}}{{30}} = \frac{7}{{10}}\end{array}3×52:7=152:7=1514\begin{array}{l}3 \times \frac{5}{2}:7\\ = \frac{{15}}{2}:7 = \frac{{15}}{{14}}\end{array}
12+13×25=112+215=1530+430=1930\begin{array}{l}\frac{1}{2} + \frac{1}{3} \times \frac{2}{5}\\ = \frac{1}{{12}} + \frac{2}{{15}}\\ = \frac{{15}}{{30}} + \frac{4}{{30}} = \frac{{19}}{{30}}\end{array}34−12:23=34−34=0\begin{array}{l}\frac{3}{4} - \frac{1}{2}:\frac{2}{3}\\ = \frac{3}{4} - \frac{3}{4} = 0\end{array}23×35+14=615+14=2460+1560=3960=1320\begin{array}{l}\frac{2}{3} \times \frac{3}{5} + \frac{1}{4}\\ = \frac{6}{{15}} + \frac{1}{4}\\ = \frac{{24}}{{60}} + \frac{{15}}{{60}} = \frac{{39}}{{60}} = \frac{{13}}{{20}}\end{array}
56:23−13=54−13=1512−412=1112\begin{array}{l}\frac{5}{6}:\frac{2}{3} - \frac{1}{3}\\ = \frac{5}{4} - \frac{1}{3} = \frac{{15}}{{12}} - \frac{4}{{12}} = \frac{{11}}{{12}}\end{array}14+25:37=14+1415=1560+5660=7160\begin{array}{l}\frac{1}{4} + \frac{2}{5}:\frac{3}{7}\\ = \frac{1}{4} + \frac{{14}}{{15}}\\ = \frac{{15}}{{60}} + \frac{{56}}{{60}} = \frac{{71}}{{60}}\end{array}38−14×23=38−212=924−424=524\begin{array}{l}\frac{3}{8} - \frac{1}{4} \times \frac{2}{3}\\ = \frac{3}{8} - \frac{2}{{12}}\\ = \frac{9}{{24}} - \frac{4}{{24}} = \frac{5}{{24}}\end{array}
45×27+13=835+13)=24105+35105=59105\begin{array}{l}\frac{4}{5} \times \frac{2}{7} + \frac{1}{3}\\ = \frac{8}{{35}} + \frac{1}{3})\\ = \frac{{24}}{{105}} + \frac{{35}}{{105}} = \frac{{59}}{{105}}\end{array}23:12−34=43−34=1612−912=712\begin{array}{l}\frac{2}{3}:\frac{1}{2} - \frac{3}{4}\\ = \frac{4}{3} - \frac{3}{4}\\ = \frac{{16}}{{12}} - \frac{9}{{12}} = \frac{7}{{12}}\end{array}16+34×25=16+620=530+930=1430=715\begin{array}{l}\frac{1}{6} + \frac{3}{4} \times \frac{2}{5}\\ = \frac{1}{6} + \frac{6}{{20}}\\ = \frac{5}{{30}} + \frac{9}{{30}} = \frac{{14}}{{30}} = \frac{7}{{15}}\end{array}
13×45+27=415+27=28105+30105=58105\begin{array}{l}\frac{1}{3} \times \frac{4}{5} + \frac{2}{7}\\ = \frac{4}{{15}} + \frac{2}{7}\\ = \frac{{28}}{{105}} + \frac{{30}}{{105}} = \frac{{58}}{{105}}\end{array}35:13−12=95−12=1810−510=1310\begin{array}{l}\frac{3}{5}:\frac{1}{3} - \frac{1}{2}\\ = \frac{9}{5} - \frac{1}{2}\\ = \frac{{18}}{{10}} - \frac{5}{{10}} = \frac{{13}}{{10}}\end{array}25+14×38=25+332=64160+15160=79160\begin{array}{l}\frac{2}{5} + \frac{1}{4} \times \frac{3}{8}\\ = \frac{2}{5} + \frac{3}{{32}}\\ = \frac{{64}}{{160}} + \frac{{15}}{{160}} = \frac{{79}}{{160}}\end{array}
12×34+15=38+15=1540+840=2340\begin{array}{l}\frac{1}{2} \times \frac{3}{4} + \frac{1}{5}\\ = \frac{3}{8} + \frac{1}{5}\\ = \frac{{15}}{{40}} + \frac{8}{{40}} = \frac{{23}}{{40}}\end{array}58:12−23=54−23=1512−812=712\begin{array}{l}\frac{5}{8}:\frac{1}{2} - \frac{2}{3}\\ = \frac{5}{4} - \frac{2}{3}\\ = \frac{{15}}{{12}} - \frac{8}{{12}} = \frac{7}{{12}}\end{array}37+23×14=37+212=3684+1484=5084=2542\begin{array}{l}\frac{3}{7} + \frac{2}{3} \times \frac{1}{4}\\ = \frac{3}{7} + \frac{2}{{12}}\\ = \frac{{36}}{{84}} + \frac{{14}}{{84}} = \frac{{50}}{{84}} = \frac{{25}}{{42}}\end{array}
23×15+34=215+34=860+4560=5360\begin{array}{l}\frac{2}{3} \times \frac{1}{5} + \frac{3}{4}\\ = \frac{2}{{15}} + \frac{3}{4}\\ = \frac{8}{{60}} + \frac{{45}}{{60}} = \frac{{53}}{{60}}\end{array}56:34−14=2018−12=2018−918=1118\begin{array}{l}\frac{5}{6}:\frac{3}{4} - \frac{1}{4}\\ = \frac{{20}}{{18}} - \frac{1}{2}\\ = \frac{{20}}{{18}} - \frac{9}{{18}} = \frac{{11}}{{18}}\end{array}14+27×35=14+635=35140+24140=59140\begin{array}{l}\frac{1}{4} + \frac{2}{7} \times \frac{3}{5}\\ = \frac{1}{4} + \frac{6}{{35}}\\ = \frac{{35}}{{140}} + \frac{{24}}{{140}} = \frac{{59}}{{140}}\end{array}
25×47+13=835+13=24105+35105=59105\begin{array}{l}\frac{2}{5} \times \frac{4}{7} + \frac{1}{3}\\ = \frac{8}{{35}} + \frac{1}{3}\\ = \frac{{24}}{{105}} + \frac{{35}}{{105}} = \frac{{59}}{{105}}\end{array}49:23−16=46−16=36=12\begin{array}{l}\frac{4}{9}:\frac{2}{3} - \frac{1}{6}\\ = \frac{4}{6} - \frac{1}{6}\\ = \frac{3}{6} = \frac{1}{2}\end{array}15+38×27=15+656=56280+30280=86280=43140\begin{array}{l}\frac{1}{5} + \frac{3}{8} \times \frac{2}{7}\\ = \frac{1}{5} + \frac{6}{{56}}\\ = \frac{{56}}{{280}} + \frac{{30}}{{280}} = \frac{{86}}{{280}} = \frac{{43}}{{140}}\end{array}
57−14:35=57−512=6084−3584=2584\begin{array}{l}\frac{5}{7} - \frac{1}{4}:\frac{3}{5}\\ = \frac{5}{7} - \frac{5}{{12}}\\ = \frac{{60}}{{84}} - \frac{{35}}{{84}} = \frac{{25}}{{84}}\end{array}35×23+14=615+14=2460+1560=3960=1320\begin{array}{l}\frac{3}{5} \times \frac{2}{3} + \frac{1}{4}\\ = \frac{6}{{15}} + \frac{1}{4}\\ = \frac{{24}}{{60}} + \frac{{15}}{{60}} = \frac{{39}}{{60}} = \frac{{13}}{{20}}\end{array}23:15−37=103−37=7021−921=6121\begin{array}{l}\frac{2}{3}:\frac{1}{5} - \frac{3}{7}\\ = \frac{{10}}{3} - \frac{3}{7}\\ = \frac{{70}}{{21}} - \frac{9}{{21}} = \frac{{61}}{{21}}\end{array}

Câu 2

1 điểm
29×34+56=\frac{2}{9} \times \frac{3}{4} + \frac{5}{6} =...78−13:45=\frac{7}{8} - \frac{1}{3}:\frac{4}{5} =...37:25+19=\frac{3}{7}:\frac{2}{5} + \frac{1}{9} =...
59:13−211=\frac{5}{9}:\frac{1}{3} - \frac{2}{{11}} =...34+18×56=\frac{3}{4} + \frac{1}{8} \times \frac{5}{6} =...27×611+49=\frac{2}{7} \times \frac{6}{{11}} + \frac{4}{9} =...
1112:56−14=\frac{{11}}{{12}}:\frac{5}{6} - \frac{1}{4} =...15+79×38=\frac{1}{5} + \frac{7}{9} \times \frac{3}{8} =...310×58+712=\frac{3}{{10}} \times \frac{5}{8} + \frac{7}{{12}} =...
911:34−25=\frac{9}{{11}}:\frac{3}{4} - \frac{2}{5} =...13+47×59=\frac{1}{3} + \frac{4}{7} \times \frac{5}{9} =...56−14×35=\frac{5}{6} - \frac{1}{4} \times \frac{3}{5} =...
29:16+78=\frac{2}{9}:\frac{1}{6} + \frac{7}{8} =...38+512×27=\frac{3}{8} + \frac{5}{{12}} \times \frac{2}{7} =...710−(49:23)=\frac{7}{{10}} - (\frac{4}{9}:\frac{2}{3}) =...
17×64+310=\frac{1}{7} \times \frac{6}{4} + \frac{3}{{10}} =...58:29−16=\frac{5}{8}:\frac{2}{9} - \frac{1}{6} =...411+35×78=\frac{4}{{11}} + \frac{3}{5} \times \frac{7}{8} =...
914−17:34=\frac{9}{{14}} - \frac{1}{7}:\frac{3}{4} =...25×310+1112=\frac{2}{5} \times \frac{3}{{10}} + \frac{{11}}{{12}} =...79:56−27=\frac{7}{9}:\frac{5}{6} - \frac{2}{7} =...
18+49×57=\frac{1}{8} + \frac{4}{9} \times \frac{5}{7} =...35−211:47=\frac{3}{5} - \frac{2}{{11}}:\frac{4}{7} =...35−211:47=\frac{3}{5} - \frac{2}{{11}}:\frac{4}{7} =...
512×38+19=\frac{5}{{12}} \times \frac{3}{8} + \frac{1}{9} =...815:25−310=\frac{8}{{15}}:\frac{2}{5} - \frac{3}{{10}} =...14+710×29=\frac{1}{4} + \frac{7}{{10}} \times \frac{2}{9} =...
67−38×59=\frac{6}{7} - \frac{3}{8} \times \frac{5}{9} =...23×411+512=\frac{2}{3} \times \frac{4}{{11}} + \frac{5}{{12}} =...910:35−18=\frac{9}{{10}}:\frac{3}{5} - \frac{1}{8} =...
16+57×310=\frac{1}{6} + \frac{5}{7} \times \frac{3}{{10}} =...38×59+712=\frac{3}{8} \times \frac{5}{9} + \frac{7}{{12}} =...1115:45−29=\frac{{11}}{{15}}:\frac{4}{5} - \frac{2}{9} =...
17+310×49=\frac{1}{7} + \frac{3}{{10}} \times \frac{4}{9} =...25×78+311=\frac{2}{5} \times \frac{7}{8} + \frac{3}{{11}} =...85:56−17=\frac{8}{5}:\frac{5}{6} - \frac{1}{7} =...
45:23−710=\frac{4}{5}:\frac{2}{3} - \frac{7}{{10}} =...29×37+58=\frac{2}{9} \times \frac{3}{7} + \frac{5}{8} =...712−38×59=\frac{7}{{12}} - \frac{3}{8} \times \frac{5}{9} =...
57−14:35=\frac{5}{7} - \frac{1}{4}:\frac{3}{5} =...35×23+14=\frac{3}{5} \times \frac{2}{3} + \frac{1}{4} =...23:15−37=\frac{2}{3}:\frac{1}{5} - \frac{3}{7} =...
513×27+38=\frac{5}{{13}} \times \frac{2}{7} + \frac{3}{8} =...15×37+29=\frac{1}{5} \times \frac{3}{7} + \frac{2}{9} =...47−13:58=\frac{4}{7} - \frac{1}{3}:\frac{5}{8} =...
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29×34+56=636+56=636+3036=3636=1\begin{array}{l}\frac{2}{9} \times \frac{3}{4} + \frac{5}{6}\\ = \frac{6}{{36}} + \frac{5}{6}\\ = \frac{6}{{36}} + \frac{{30}}{{36}} = \frac{{36}}{{36}} = 1\end{array}78−13:45=78−512=2124−1024=1124\begin{array}{l}\frac{7}{8} - \frac{1}{3}:\frac{4}{5}\\ = \frac{7}{8} - \frac{5}{{12}}\\ = \frac{{21}}{{24}} - \frac{{10}}{{24}} = \frac{{11}}{{24}}\end{array}37:25+19=1514+19=135126+14126=149126\begin{array}{l}\frac{3}{7}:\frac{2}{5} + \frac{1}{9}\\ = \frac{{15}}{{14}} + \frac{1}{9}\\ = \frac{{135}}{{126}} + \frac{{14}}{{126}} = \frac{{149}}{{126}}\end{array}
59:13−211=53−211=5533−633=4933\begin{array}{l}\frac{5}{9}:\frac{1}{3} - \frac{2}{{11}}\\ = \frac{5}{3} - \frac{2}{{11}}\\ = \frac{{55}}{{33}} - \frac{6}{{33}} = \frac{{49}}{{33}}\end{array}34+18×56=34+548=3648+548=4148\begin{array}{l}\frac{3}{4} + \frac{1}{8} \times \frac{5}{6}\\ = \frac{3}{4} + \frac{5}{{48}}\\ = \frac{{36}}{{48}} + \frac{5}{{48}} = \frac{{41}}{{48}}\end{array}27×611+49=1277+49=108693+308693=416693=6499\begin{array}{l}\frac{2}{7} \times \frac{6}{{11}} + \frac{4}{9}\\ = \frac{{12}}{{77}} + \frac{4}{9}\\ = \frac{{108}}{{693}} + \frac{{308}}{{693}} = \frac{{416}}{{693}} = \frac{{64}}{{99}}\end{array}
1112:56−14=1110−14=4440−1040=3440=1720\begin{array}{l}\frac{{11}}{{12}}:\frac{5}{6} - \frac{1}{4}\\ = \frac{{11}}{{10}} - \frac{1}{4}\\ = \frac{{44}}{{40}} - \frac{{10}}{{40}} = \frac{{34}}{{40}} = \frac{{17}}{{20}}\end{array}15+79×38=15+2172=72360+105360=177360=59120\begin{array}{l}\frac{1}{5} + \frac{7}{9} \times \frac{3}{8}\\ = \frac{1}{5} + \frac{{21}}{{72}}\\ = \frac{{72}}{{360}} + \frac{{105}}{{360}} = \frac{{177}}{{360}} = \frac{{59}}{{120}}\end{array}310×58+712=1580+712=45240+140240=185240=3748\begin{array}{l}\frac{3}{{10}} \times \frac{5}{8} + \frac{7}{{12}}\\ = \frac{{15}}{{80}} + \frac{7}{{12}}\\ = \frac{{45}}{{240}} + \frac{{140}}{{240}} = \frac{{185}}{{240}} = \frac{{37}}{{48}}\end{array}
911:34−25=3633−25=180165−66165=114165=3855\begin{array}{l}\frac{9}{{11}}:\frac{3}{4} - \frac{2}{5}\\ = \frac{{36}}{{33}} - \frac{2}{5}\\ = \frac{{180}}{{165}} - \frac{{66}}{{165}} = \frac{{114}}{{165}} = \frac{{38}}{{55}}\end{array}13+47×59=13+2063=2163+2063=4163\begin{array}{l}\frac{1}{3} + \frac{4}{7} \times \frac{5}{9}\\ = \frac{1}{3} + \frac{{20}}{{63}}\\ = \frac{{21}}{{63}} + \frac{{20}}{{63}} = \frac{{41}}{{63}}\end{array}56−14×35=56−320=5060−960=4160\begin{array}{l}\frac{5}{6} - \frac{1}{4} \times \frac{3}{5}\\ = \frac{5}{6} - \frac{3}{{20}}\\ = \frac{{50}}{{60}} - \frac{9}{{60}} = \frac{{41}}{{60}}\end{array}
29:16+78=43+78=3224+2124=5324\begin{array}{l}\frac{2}{9}:\frac{1}{6} + \frac{7}{8}\\ = \frac{4}{3} + \frac{7}{8}\\ = \frac{{32}}{{24}} + \frac{{21}}{{24}} = \frac{{53}}{{24}}\end{array}38+512×27=38+1084=126336+40336=166336=83168\begin{array}{l}\frac{3}{8} + \frac{5}{{12}} \times \frac{2}{7}\\ = \frac{3}{8} + \frac{{10}}{{84}}\\ = \frac{{126}}{{336}} + \frac{{40}}{{336}} = \frac{{166}}{{336}} = \frac{{83}}{{168}}\end{array}710−(49:23)=710−46=2130−2030=130\begin{array}{l}\frac{7}{{10}} - (\frac{4}{9}:\frac{2}{3})\\ = \frac{7}{{10}} - \frac{4}{6}\\ = \frac{{21}}{{30}} - \frac{{20}}{{30}} = \frac{1}{{30}}\end{array}
17×64+310=635+310=60350+105350=165350=3370\begin{array}{l}\frac{1}{7} \times \frac{6}{4} + \frac{3}{{10}}\\ = \frac{6}{{35}} + \frac{3}{{10}} = \frac{{60}}{{350}} + \frac{{105}}{{350}} = \frac{{165}}{{350}} = \frac{{33}}{{70}}\end{array}58:29−16=4516−16=13548−848=12748\begin{array}{l}\frac{5}{8}:\frac{2}{9} - \frac{1}{6}\\ = \frac{{45}}{{16}} - \frac{1}{6} = \frac{{135}}{{48}} - \frac{8}{{48}} = \frac{{127}}{{48}}\end{array}411+35×78=411+2140=160440+231440=391440\begin{array}{l}\frac{4}{{11}} + \frac{3}{5} \times \frac{7}{8}\\ = \frac{4}{{11}} + \frac{{21}}{{40}} = \frac{{160}}{{440}} + \frac{{231}}{{440}} = \frac{{391}}{{440}}\end{array}
914−17:34=914−421=2742−842=1942\begin{array}{l}\frac{9}{{14}} - \frac{1}{7}:\frac{3}{4}\\ = \frac{9}{{14}} - \frac{4}{{21}}\\ = \frac{{27}}{{42}} - \frac{8}{{42}} = \frac{{19}}{{42}}\end{array}25×310+1112=650+1112=36300+275300=311300\begin{array}{l}\frac{2}{5} \times \frac{3}{{10}} + \frac{{11}}{{12}}\\ = \frac{6}{{50}} + \frac{{11}}{{12}} = \frac{{36}}{{300}} + \frac{{275}}{{300}} = \frac{{311}}{{300}}\end{array}79:56−27=4245−27=294315−90315=204315=68105\begin{array}{l}\frac{7}{9}:\frac{5}{6} - \frac{2}{7}\\ = \frac{{42}}{{45}} - \frac{2}{7}\\ = \frac{{294}}{{315}} - \frac{{90}}{{315}} = \frac{{204}}{{315}} = \frac{{68}}{{105}}\end{array}
18+49×57=18+2063=63504+160504=223504\begin{array}{l}\frac{1}{8} + \frac{4}{9} \times \frac{5}{7}\\ = \frac{1}{8} + \frac{{20}}{{63}} = \frac{{63}}{{504}} + \frac{{160}}{{504}} = \frac{{223}}{{504}}\end{array}35−211:47=35−722=66110−35110=31110\begin{array}{l}\frac{3}{5} - \frac{2}{{11}}:\frac{4}{7}\\ = \frac{3}{5} - \frac{7}{{22}}\\ = \frac{{66}}{{110}} - \frac{{35}}{{110}} = \frac{{31}}{{110}}\end{array}35−211:47=35−722=66110−35110=31110\begin{array}{l}\frac{3}{5} - \frac{2}{{11}}:\frac{4}{7}\\ = \frac{3}{5} - \frac{7}{{22}}\\ = \frac{{66}}{{110}} - \frac{{35}}{{110}} = \frac{{31}}{{110}}\end{array}
512×38+19=1596+19=45288+32288=77288\begin{array}{l}\frac{5}{{12}} \times \frac{3}{8} + \frac{1}{9}\\ = \frac{{15}}{{96}} + \frac{1}{9}\\ = \frac{{45}}{{288}} + \frac{{32}}{{288}} = \frac{{77}}{{288}}\end{array}815:25−310=43−310=4030−930=3130\begin{array}{l}\frac{8}{{15}}:\frac{2}{5} - \frac{3}{{10}}\\ = \frac{4}{3} - \frac{3}{{10}}\\ = \frac{{40}}{{30}} - \frac{9}{{30}} = \frac{{31}}{{30}}\end{array}14+710×29=14+1490=45180+28180=73180\begin{array}{l}\frac{1}{4} + \frac{7}{{10}} \times \frac{2}{9}\\ = \frac{1}{4} + \frac{{14}}{{90}}\\ = \frac{{45}}{{180}} + \frac{{28}}{{180}} = \frac{{73}}{{180}}\end{array}
67−38×59=67−524=144168−35168=109168\begin{array}{l}\frac{6}{7} - \frac{3}{8} \times \frac{5}{9}\\ = \frac{6}{7} - \frac{5}{{24}}\\ = \frac{{144}}{{168}} - \frac{{35}}{{168}} = \frac{{109}}{{168}}\end{array}23×411+512=833+512=96396+165396=261396=87132\begin{array}{l}\frac{2}{3} \times \frac{4}{{11}} + \frac{5}{{12}}\\ = \frac{8}{{33}} + \frac{5}{{12}}\\ = \frac{{96}}{{396}} + \frac{{165}}{{396}} = \frac{{261}}{{396}} = \frac{{87}}{{132}}\end{array}910:35−18=32−18=2416−216=2216=118\begin{array}{l}\frac{9}{{10}}:\frac{3}{5} - \frac{1}{8}\\ = \frac{3}{2} - \frac{1}{8}\\ = \frac{{24}}{{16}} - \frac{2}{{16}} = \frac{{22}}{{16}} = \frac{{11}}{8}\end{array}
16+57×310=16+1570=70420+90420=160420=821\begin{array}{l}\frac{1}{6} + \frac{5}{7} \times \frac{3}{{10}}\\ = \frac{1}{6} + \frac{{15}}{{70}}\\ = \frac{{70}}{{420}} + \frac{{90}}{{420}} = \frac{{160}}{{420}} = \frac{8}{{21}}\end{array}38×59+712=1572+712=1572+4272=5772=1924\begin{array}{l}\frac{3}{8} \times \frac{5}{9} + \frac{7}{{12}}\\ = \frac{{15}}{{72}} + \frac{7}{{12}}\\ = \frac{{15}}{{72}} + \frac{{42}}{{72}} = \frac{{57}}{{72}} = \frac{{19}}{{24}}\end{array}1115:45−29=1112−29=99108−24108=75108=2536\begin{array}{l}\frac{{11}}{{15}}:\frac{4}{5} - \frac{2}{9}\\ = \frac{{11}}{{12}} - \frac{2}{9}\\ = \frac{{99}}{{108}} - \frac{{24}}{{108}} = \frac{{75}}{{108}} = \frac{{25}}{{36}}\end{array}
17+310×49=17+1290=17+215=14105+14105=29105\begin{array}{l}\frac{1}{7} + \frac{3}{{10}} \times \frac{4}{9}\\ = \frac{1}{7} + \frac{{12}}{{90}}\\ = \frac{1}{7} + \frac{2}{{15}} = \frac{{14}}{{105}} + \frac{{14}}{{105}} = \frac{{29}}{{105}}\end{array}25×78+311=1440+311=154440+120440=274440=137120\begin{array}{l}\frac{2}{5} \times \frac{7}{8} + \frac{3}{{11}}\\ = \frac{{14}}{{40}} + \frac{3}{{11}}\\ = \frac{{154}}{{440}} + \frac{{120}}{{440}} = \frac{{274}}{{440}} = \frac{{137}}{{120}}\end{array}85:56−17=1615−17=112105−15105=97105\begin{array}{l}\frac{8}{5}:\frac{5}{6} - \frac{1}{7}\\ = \frac{{16}}{{15}} - \frac{1}{7}\\ = \frac{{112}}{{105}} - \frac{{15}}{{105}} = \frac{{97}}{{105}}\end{array}
45:23−710=65−710=1210−710=510=12\begin{array}{l}\frac{4}{5}:\frac{2}{3} - \frac{7}{{10}}\\ = \frac{6}{5} - \frac{7}{{10}}\\ = \frac{{12}}{{10}} - \frac{7}{{10}} = \frac{5}{{10}} = \frac{1}{2}\end{array}29×37+58=663+58=48504+315504=363504=121168\begin{array}{l}\frac{2}{9} \times \frac{3}{7} + \frac{5}{8}\\ = \frac{6}{{63}} + \frac{5}{8}\\ = \frac{{48}}{{504}} + \frac{{315}}{{504}} = \frac{{363}}{{504}} = \frac{{121}}{{168}}\end{array}712−38×59=712−1572=4272−1572=2772=38\begin{array}{l}\frac{7}{{12}} - \frac{3}{8} \times \frac{5}{9}\\ = \frac{7}{{12}} - \frac{{15}}{{72}}\\ = \frac{{42}}{{72}} - \frac{{15}}{{72}} = \frac{{27}}{{72}} = \frac{3}{8}\end{array}
57−14:35=57−512=6084−3584=2584\begin{array}{l}\frac{5}{7} - \frac{1}{4}:\frac{3}{5}\\ = \frac{5}{7} - \frac{5}{{12}}\\ = \frac{{60}}{{84}} - \frac{{35}}{{84}} = \frac{{25}}{{84}}\end{array}35×23+14=615+14=2460+1560=3960=1320\begin{array}{l}\frac{3}{5} \times \frac{2}{3} + \frac{1}{4}\\ = \frac{6}{{15}} + \frac{1}{4}\\ = \frac{{24}}{{60}} + \frac{{15}}{{60}} = \frac{{39}}{{60}} = \frac{{13}}{{20}}\end{array}23:15−37=103−37=7021−921=6121\begin{array}{l}\frac{2}{3}:\frac{1}{5} - \frac{3}{7}\\ = \frac{{10}}{3} - \frac{3}{7}\\ = \frac{{70}}{{21}} - \frac{9}{{21}} = \frac{{61}}{{21}}\end{array}
513×27+38=1091+38=80728+273728=353728\begin{array}{l}\frac{5}{{13}} \times \frac{2}{7} + \frac{3}{8}\\ = \frac{{10}}{{91}} + \frac{3}{8}\\ = \frac{{80}}{{728}} + \frac{{273}}{{728}} = \frac{{353}}{{728}}\end{array}15×37+29=335+29=27315+70315=97315\begin{array}{l}\frac{1}{5} \times \frac{3}{7} + \frac{2}{9}\\ = \frac{3}{{35}} + \frac{2}{9}\\ = \frac{{27}}{{315}} + \frac{{70}}{{315}} = \frac{{97}}{{315}}\end{array}47−13:58=47−815=60105−56105=4105\begin{array}{l}\frac{4}{7} - \frac{1}{3}:\frac{5}{8}\\ = \frac{4}{7} - \frac{8}{{15}}\\ = \frac{{60}}{{105}} - \frac{{56}}{{105}} = \frac{4}{{105}}\end{array}

Câu 3

1 điểm
13×57+29−38=\frac{1}{3} \times \frac{5}{7} + \frac{2}{9} - \frac{3}{8} =...17×59+211=\frac{1}{7} \times \frac{5}{9} + \frac{2}{{11}} =...19×57+213=\frac{1}{9} \times \frac{5}{7} + \frac{2}{{13}} =...
45−27:38+16=\frac{4}{5} - \frac{2}{7}:\frac{3}{8} + \frac{1}{6} =...310:14+513=\frac{3}{{10}}:\frac{1}{4} + \frac{5}{{13}} =...37−14×59=\frac{3}{7} - \frac{1}{4} \times \frac{5}{9} =...
311:14×59+213=\frac{3}{{11}}:\frac{1}{4} \times \frac{5}{9} + \frac{2}{{13}} =...712+38×511=\frac{7}{{12}} + \frac{3}{8} \times \frac{5}{{11}} =...713×25+18=\frac{7}{{13}} \times \frac{2}{5} + \frac{1}{8} =...
712+15×38−29=\frac{7}{{12}} + \frac{1}{5} \times \frac{3}{8} - \frac{2}{9} =...23−16×47=\frac{2}{3} - \frac{1}{6} \times \frac{4}{7} =...16:38−211=\frac{1}{6}:\frac{3}{8} - \frac{2}{{11}} =...
23−56×17+411=\frac{2}{3} - \frac{5}{6} \times \frac{1}{7} + \frac{4}{{11}} =...59×27+310=\frac{5}{9} \times \frac{2}{7} + \frac{3}{{10}} =...59+17:45=\frac{5}{9} + \frac{1}{7}:\frac{4}{5} =...
59×310+14:25=\frac{5}{9} \times \frac{3}{{10}} + \frac{1}{4}:\frac{2}{5} =...611+13:57=\frac{6}{{11}} + \frac{1}{3}:\frac{5}{7} =...23−512×37=\frac{2}{3} - \frac{5}{{12}} \times \frac{3}{7} =...
18:37−25×49=\frac{1}{8}:\frac{3}{7} - \frac{2}{5} \times \frac{4}{9} =...34−25×79=\frac{3}{4} - \frac{2}{5} \times \frac{7}{9} =...310×47+511=\frac{3}{{10}} \times \frac{4}{7} + \frac{5}{{11}} =...
611+29:57−13=\frac{6}{{11}} + \frac{2}{9}:\frac{5}{7} - \frac{1}{3} =...18×35+712=\frac{1}{8} \times \frac{3}{5} + \frac{7}{{12}} =...78:25−19=\frac{7}{8}:\frac{2}{5} - \frac{1}{9} =...
34×58−16+27=\frac{3}{4} \times \frac{5}{8} - \frac{1}{6} + \frac{2}{7} =...513:27−14=\frac{5}{{13}}:\frac{2}{7} - \frac{1}{4} =...67−13:58=\frac{6}{7} - \frac{1}{3}:\frac{5}{8} =...
512:27×35+18=\frac{5}{{12}}:\frac{2}{7} \times \frac{3}{5} + \frac{1}{8} =...23×411+512=\frac{2}{3} \times \frac{4}{{11}} + \frac{5}{{12}} =...29×56+314=\frac{2}{9} \times \frac{5}{6} + \frac{3}{{14}} =...
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13×57+29−38=512+29−38=40168+48168−63168=25168\begin{array}{l}\frac{1}{3} \times \frac{5}{7} + \frac{2}{9} - \frac{3}{8}\\ = \frac{5}{{12}} + \frac{2}{9} - \frac{3}{8}\\ = \frac{{40}}{{168}} + \frac{{48}}{{168}} - \frac{{63}}{{168}} = \frac{{25}}{{168}}\end{array}17×59+211=563+211=55693+126693=181693\begin{array}{l}\frac{1}{7} \times \frac{5}{9} + \frac{2}{{11}}\\ = \frac{5}{{63}} + \frac{2}{{11}}\\ = \frac{{55}}{{693}} + \frac{{126}}{{693}} = \frac{{181}}{{693}}\end{array}19×57+213=563+213=65819+126819=191819\begin{array}{l}\frac{1}{9} \times \frac{5}{7} + \frac{2}{{13}}\\ = \frac{5}{{63}} + \frac{2}{{13}}\\ = \frac{{65}}{{819}} + \frac{{126}}{{819}} = \frac{{191}}{{819}}\end{array}
45−27:38+16=45−1621+16=168210−160210+35210=43210\begin{array}{l}\frac{4}{5} - \frac{2}{7}:\frac{3}{8} + \frac{1}{6}\\ = \frac{4}{5} - \frac{{16}}{{21}} + \frac{1}{6}\\ = \frac{{168}}{{210}} - \frac{{160}}{{210}} + \frac{{35}}{{210}} = \frac{{43}}{{210}}\end{array}310:14+513=65+513=7865+2565=10365\begin{array}{l}\frac{3}{{10}}:\frac{1}{4} + \frac{5}{{13}}\\ = \frac{6}{5} + \frac{5}{{13}}\\ = \frac{{78}}{{65}} + \frac{{25}}{{65}} = \frac{{103}}{{65}}\end{array}37−14×59=37−536=108252−35252=73252\begin{array}{l}\frac{3}{7} - \frac{1}{4} \times \frac{5}{9}\\ = \frac{3}{7} - \frac{5}{{36}}\\ = \frac{{108}}{{252}} - \frac{{35}}{{252}} = \frac{{73}}{{252}}\end{array}
311:14×59+213=1211×59+213=2033+213=260429+66429=326429\begin{array}{l}\frac{3}{{11}}:\frac{1}{4} \times \frac{5}{9} + \frac{2}{{13}}\\ = \frac{{12}}{{11}} \times \frac{5}{9} + \frac{2}{{13}}\\ = \frac{{20}}{{33}} + \frac{2}{{13}} = \frac{{260}}{{429}} + \frac{{66}}{{429}} = \frac{{326}}{{429}}\end{array}712+38×511=712+1588=308528+90528=398528=199264\begin{array}{l}\frac{7}{{12}} + \frac{3}{8} \times \frac{5}{{11}}\\ = \frac{7}{{12}} + \frac{{15}}{{88}}\\ = \frac{{308}}{{528}} + \frac{{90}}{{528}} = \frac{{398}}{{528}} = \frac{{199}}{{264}}\end{array}713×25+18=1465+18=112520+65520=177520\begin{array}{l}\frac{7}{{13}} \times \frac{2}{5} + \frac{1}{8}\\ = \frac{{14}}{{65}} + \frac{1}{8}\\ = \frac{{112}}{{520}} + \frac{{65}}{{520}} = \frac{{177}}{{520}}\end{array}
712+15×38−29=712+340−29=210360+27360−80360=157360\begin{array}{l}\frac{7}{{12}} + \frac{1}{5} \times \frac{3}{8} - \frac{2}{9}\\ = \frac{7}{{12}} + \frac{3}{{40}} - \frac{2}{9}\\ = \frac{{210}}{{360}} + \frac{{27}}{{360}} - \frac{{80}}{{360}} = \frac{{157}}{{360}} \end{array}23−16×47=23−442=2842−442=2442=47\begin{array}{l}\frac{2}{3} - \frac{1}{6} \times \frac{4}{7}\\ = \frac{2}{3} - \frac{4}{{42}}\\ = \frac{{28}}{{42}} - \frac{4}{{42}} = \frac{{24}}{{42}} = \frac{4}{7}\end{array}16:38−211=49−211=4499−1899=2699\begin{array}{l}\frac{1}{6}:\frac{3}{8} - \frac{2}{{11}}\\ = \frac{4}{9} - \frac{2}{{11}}\\ = \frac{{44}}{{99}} - \frac{{18}}{{99}} = \frac{{26}}{{99}}\end{array}
23−56×17+411=23−542+411=308462−55462+168462=421462\begin{array}{l}\frac{2}{3} - \frac{5}{6} \times \frac{1}{7} + \frac{4}{{11}}\\ = \frac{2}{3} - \frac{5}{{42}} + \frac{4}{{11}}\\ = \frac{{308}}{{462}} - \frac{{55}}{{462}} + \frac{{168}}{{462}} = \frac{{421}}{{462}}\end{array}59×27+310=1063+310=100630+189630=289630\begin{array}{l}\frac{5}{9} \times \frac{2}{7} + \frac{3}{{10}}\\ = \frac{{10}}{{63}} + \frac{3}{{10}}\\ = \frac{{100}}{{630}} + \frac{{189}}{{630}} = \frac{{289}}{{630}}\end{array}59+17:45=59+528=140252+45252=185252\begin{array}{l}\frac{5}{9} + \frac{1}{7}:\frac{4}{5}\\ = \frac{5}{9} + \frac{5}{{28}}\\ = \frac{{140}}{{252}} + \frac{{45}}{{252}} = \frac{{185}}{{252}}\end{array}
59×310+14:25=1590+58=60360+225360=285360=1924\begin{array}{l}\frac{5}{9} \times \frac{3}{{10}} + \frac{1}{4}:\frac{2}{5}\\ = \frac{{15}}{{90}} + \frac{5}{8} = \frac{{60}}{{360}} + \frac{{225}}{{360}}\\ = \frac{{285}}{{360}} = \frac{{19}}{{24}}\end{array}611+13:57=611+715=90165+77165=167165\begin{array}{l}\frac{6}{{11}} + \frac{1}{3}:\frac{5}{7}\\ = \frac{6}{{11}} + \frac{7}{{15}} = \frac{{90}}{{165}} + \frac{{77}}{{165}}\\ = \frac{{167}}{{165}}\end{array}23−512×37=23−1584=5684−1584=4184\begin{array}{l}\frac{2}{3} - \frac{5}{{12}} \times \frac{3}{7}\\ = \frac{2}{3} - \frac{{15}}{{84}} = \frac{{56}}{{84}} - \frac{{15}}{{84}}\\ = \frac{{41}}{{84}}\end{array}
18:37−25×49=724−845=3151080−1921080=1231080=41360\begin{array}{l}\frac{1}{8}:\frac{3}{7} - \frac{2}{5} \times \frac{4}{9}\\ = \frac{7}{{24}} - \frac{8}{{45}}\\ = \frac{{315}}{{1080}} - \frac{{192}}{{1080}} = \frac{{123}}{{1080}} = \frac{{41}}{{360}}\end{array}34−25×79=34−1445=135180−56180=79180\begin{array}{l}\frac{3}{4} - \frac{2}{5} \times \frac{7}{9}\\ = \frac{3}{4} - \frac{{14}}{{45}} = \frac{{135}}{{180}} - \frac{{56}}{{180}}\\ = \frac{{79}}{{180}}\end{array}310×47+511=1270+511=132770+350770=482770=241385\begin{array}{l}\frac{3}{{10}} \times \frac{4}{7} + \frac{5}{{11}}\\ = \frac{{12}}{{70}} + \frac{5}{{11}}\\ = \frac{{132}}{{770}} + \frac{{350}}{{770}} = \frac{{482}}{{770}} = \frac{{241}}{{385}}\end{array}
611+29:57−13=611+1445−13=270495+154495−165495=259495\begin{array}{l}\frac{6}{{11}} + \frac{2}{9}:\frac{5}{7} - \frac{1}{3}\\ = \frac{6}{{11}} + \frac{{14}}{{45}} - \frac{1}{3}\\ = \frac{{270}}{{495}} + \frac{{154}}{{495}} - \frac{{165}}{{495}} = \frac{{259}}{{495}}\end{array}18×35+712=340+712=9120+70120=79120\begin{array}{l}\frac{1}{8} \times \frac{3}{5} + \frac{7}{{12}}\\ = \frac{3}{{40}} + \frac{7}{{12}}\\ = \frac{9}{{120}} + \frac{{70}}{{120}} = \frac{{79}}{{120}}\end{array}78:25−19=3516−19=315144−16144=299144\begin{array}{l}\frac{7}{8}:\frac{2}{5} - \frac{1}{9}\\ = \frac{{35}}{{16}} - \frac{1}{9}\\ = \frac{{315}}{{144}} - \frac{{16}}{{144}} = \frac{{299}}{{144}}\end{array}
34×58−16+27=1532−16+27=315672−112672+192672=395672\begin{array}{l}\frac{3}{4} \times \frac{5}{8} - \frac{1}{6} + \frac{2}{7}\\ = \frac{{15}}{{32}} - \frac{1}{6} + \frac{2}{7}\\ = \frac{{315}}{{672}} - \frac{{112}}{{672}} + \frac{{192}}{{672}} = \frac{{395}}{{672}}\end{array}513:27−14=3526−14=7052−1352=5752\begin{array}{l}\frac{5}{{13}}:\frac{2}{7} - \frac{1}{4}\\ = \frac{{35}}{{26}} - \frac{1}{4}\\ = \frac{{70}}{{52}} - \frac{{13}}{{52}} = \frac{{57}}{{52}}\end{array}67−13:58=67−815=90105−56105=34105\begin{array}{l}\frac{6}{7} - \frac{1}{3}:\frac{5}{8}\\ = \frac{6}{7} - \frac{8}{{15}}\\ = \frac{{90}}{{105}} - \frac{{56}}{{105}} = \frac{{34}}{{105}}\end{array}
512:27×35+18=3524×35+18=218+18=228=114\begin{array}{l}\frac{5}{{12}}:\frac{2}{7} \times \frac{3}{5} + \frac{1}{8}\\ = \frac{{35}}{{24}} \times \frac{3}{5} + \frac{1}{8}\\ = \frac{{21}}{8} + \frac{1}{8} = \frac{{22}}{8} = \frac{{11}}{4}\end{array}23×411+512=833+512=96396+165396=261396=87132\begin{array}{l}\frac{2}{3} \times \frac{4}{{11}} + \frac{5}{{12}}\\ = \frac{8}{{33}} + \frac{5}{{12}}\\ = \frac{{96}}{{396}} + \frac{{165}}{{396}} = \frac{{261}}{{396}} = \frac{{87}}{{132}}\end{array}29×56+314=1054+314=70378+81378=151378\begin{array}{l}\frac{2}{9} \times \frac{5}{6} + \frac{3}{{14}}\\ = \frac{{10}}{{54}} + \frac{3}{{14}}\\ = \frac{{70}}{{378}} + \frac{{81}}{{378}} = \frac{{151}}{{378}}\end{array}
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Tất cả đề III. Tính giá trị biểu thức chứa phân số · Các bộ sách Toán Lớp 5