13 bài tập Đo diện tích – đo thể tích có lời giải

Hướng Dẫn Giải

- $27{m^2} = 27 \times 100d{m^2} = 2700d{m^2}$;

- $782d{m^2} = 700d{m^2} + 82d{m^2} = 700:100{m^2} + 82d{m^2}$

$= 7{m^2} + 82d{m^2} = 7{m^2}82d{m^2}$.

- $4000c{m^2} = 4000:100d{m^2} = 40d{m^2}$.

- $123456c{m^2} = 120000c{m^2} + 3400c{m^2} + 56c{m^2}$

$= 120000:10000c{m^2} + 3400:100d{m^2} + 56c{m^2}$

$= 12{m^2} + 34d{m^2} + 56c{m^2} = 12{m^2}34d{m^2}56c{m^2}$.

- $79{m^2}3d{m^2} = 79{m^2} + 3d{m^2} = 79 \times 100d{m^2} + 3d{m^2}$

$= 7900d{m^2} + 3d{m^2} = 7903d{m^2}$.

- $52{m^2}94d{m^2} = 52{m^2} + 94d{m^2} = 52 \times 100d{m^2} + 94d{m^2}$

$= 5200d{m^2} + 94d{m^2} = 5294d{m^2}$.

Hướng Dẫn Giải

- $9{m^2} = ..........d{m^2}$

$9{m^2} = 9 \times 100d{m^2} = 900d{m^2}$

- $490{m^2} = ..........d{m^2}$

$490{m^2} = 490 \times 100d{m^2} = 49000d{m^2}$

- $172{\rm{ d}}{{\rm{m}}^2} = ...{\rm{ c}}{{\rm{m}}^2}$

$172{\rm{ d}}{{\rm{m}}^2} = 172 \times 100{\rm{ c}}{{\rm{m}}^2} = 17200{\rm{ c}}{{\rm{m}}^2}$.

- $9657{\rm{d}}{{\rm{m}}^2} = ...{\rm{ }}{{\rm{m}}^2}...{\rm{ d}}{{\rm{m}}^2}$

$9657{\rm{ d}}{{\rm{m}}^2} = 9600{\rm{d}}{{\rm{m}}^2} + 57{\rm{d}}{{\rm{m}}^2} = 9600:100{\rm{ }}{{\rm{m}}^2} + 57{\rm{d}}{{\rm{m}}^2} = 96{{\rm{m}}^2} + 57{\rm{d}}{{\rm{m}}^2}$

$= 96{{\rm{m}}^2}57{\rm{d}}{{\rm{m}}^2}$

- $9{{\rm{m}}^2}3{\rm{d}}{{\rm{m}}^2} = ..........{\rm{d}}{{\rm{m}}^2}$

$9{{\rm{m}}^2}3{\rm{d}}{{\rm{m}}^2} = 9{{\rm{m}}^2} + 3{\rm{d}}{{\rm{m}}^2} = 9 \times 100{\rm{d}}{{\rm{m}}^2} + 3{\rm{d}}{{\rm{m}}^2} = 900{\rm{d}}{{\rm{m}}^2} + 3{\rm{d}}{{\rm{m}}^2} = 903{\rm{d}}{{\rm{m}}^2}$

- $4{\rm{ }}{{\rm{m}}^2}25{\rm{ d}}{{\rm{m}}^2} = ...{\rm{ c}}{{\rm{m}}^2}$

$4{{\rm{m}}^2}25{\rm{d}}{{\rm{m}}^2} = 4{{\rm{m}}^2} + 25{\rm{d}}{{\rm{m}}^2} = 4 \times 10000{\rm{c}}{{\rm{m}}^2} + 25 \times 100{\rm{c}}{{\rm{m}}^2}$

$= 40000{\rm{c}}{{\rm{m}}^2} + 2500{\rm{c}}{{\rm{m}}^2} = 42500{\rm{c}}{{\rm{m}}^2}$

- $39{\rm{d}}{{\rm{m}}^2}4{\rm{ c}}{{\rm{m}}^2} = ...{\rm{c}}{{\rm{m}}^2}$

$39{\rm{d}}{{\rm{m}}^2}4{\rm{c}}{{\rm{m}}^2} = 39{\rm{d}}{{\rm{m}}^2} + 4{\rm{c}}{{\rm{m}}^2} = 39 \times 100{\rm{ c}}{{\rm{m}}^2} + 4{\rm{c}}{{\rm{m}}^2}$

$= 3900{\rm{c}}{{\rm{m}}^2} + 4{\rm{c}}{{\rm{m}}^2} = 3904{\rm{c}}{{\rm{m}}^2}$

- $1{{\rm{m}}^2}78{\rm{ d}}{{\rm{m}}^2} = ...{\rm{ c}}{{\rm{m}}^2}$

$1{{\rm{m}}^2}78{\rm{d}}{{\rm{m}}^2} = 1{{\rm{m}}^2} + 78{\rm{d}}{{\rm{m}}^2} = 1 \times 10000{\rm{c}}{{\rm{m}}^2} + 78 \times 100{\rm{c}}{{\rm{m}}^2}$

$= 10000{\rm{c}}{{\rm{m}}^2} + 7800{\rm{c}}{{\rm{m}}^2} = 17800{\rm{c}}{{\rm{m}}^2}$

Hướng Dẫn Giải

- $912{\rm{ }}{{\rm{m}}^2} = 91200{\rm{ d}}{{\rm{m}}^2}$

- $10{\rm{ k}}{{\rm{m}}^2} = 10000000{\rm{ }}{{\rm{m}}^2}$

- $7{\rm{ d}}{{\rm{m}}^2} = 700{\rm{ c}}{{\rm{m}}^2}$

- $8{{\rm{m}}^2}79{\rm{d}}{{\rm{m}}^2} = 879{\rm{ d}}{{\rm{m}}^2}$

- $2016{\rm{c}}{{\rm{m}}^2} = 20{\rm{ d}}{{\rm{m}}^2}16{\rm{ c}}{{\rm{m}}^2}$

- $9{{\rm{m}}^2}9{\rm{d}}{{\rm{m}}^2} = 909{\rm{ d}}{{\rm{m}}^2}$

- $7{{\rm{m}}^2}8{\rm{d}}{{\rm{m}}^2} = 708{\rm{ d}}{{\rm{m}}^2}$

Hướng Dẫn Giải

$14{\rm{da}}{{\rm{m}}^2} = 14 \times 100{\rm{ }}{{\rm{m}}^2} = 1400{{\rm{m}}^2}$

$1700{{\rm{m}}^2} = 1700:100{\rm{ da}}{{\rm{m}}^2} = 17{\rm{da}}{{\rm{m}}^2}$

$16{\rm{da}}{{\rm{m}}^2}10{{\rm{m}}^2} = 16{\rm{da}}{{\rm{m}}^2} + 10{{\rm{m}}^2} = 16 \times 100{{\rm{m}}^2} + 10{{\rm{m}}^2} = 1610{{\rm{m}}^2}$

$37{\rm{da}}{{\rm{m}}^2}9{{\rm{m}}^2} = 37{\rm{da}}{{\rm{m}}^2} + 9{{\rm{m}}^2} = 37 \times 100{{\rm{m}}^2} + 9{{\rm{m}}^2} = 3709{{\rm{m}}^2}$

$1{{\rm{m}}^2} = 1:100{\rm{ da}}{{\rm{m}}^2} = \frac{1}{{100}}{\rm{ da}}{{\rm{m}}^2}({\rm{hay }}0{,}01{\rm{da}}{{\rm{m}}^2})$

$8{\rm{da}}{{\rm{m}}^2} = 8:100{\rm{h}}{{\rm{m}}^2} = \frac{8}{{100}}{\rm{h}}{{\rm{m}}^2}({\rm{hay }}0{,}08{\rm{h}}{{\rm{m}}^2})$

$26{{\rm{m}}^2} = 26:100{\rm{da}}{{\rm{m}}^2} = \frac{{26}}{{100}}{\rm{da}}{{\rm{m}}^2}({\rm{hay }}0{,}26{\rm{da}}{{\rm{m}}^2})$

$42{\rm{da}}{{\rm{m}}^2} = 42:100{\rm{h}}{{\rm{m}}^2} = \frac{{42}}{{100}}{\rm{ h}}{{\rm{m}}^2}({\rm{hay }}0{,}42{\rm{h}}{{\rm{m}}^2})$

$15{{\rm{m}}^2} = 15 \times 10000{\rm{c}}{{\rm{m}}^2} = 150000{\rm{ c}}{{\rm{m}}^2}$

$7{\rm{da}}{{\rm{m}}^2} = 7 \times 10000{\rm{d}}{{\rm{m}}^2} = 70000{\rm{d}}{{\rm{m}}^2}$.

Hướng Dẫn Giải

- $2{\rm{da}}{{\rm{m}}^2}16{{\rm{m}}^2} = 2{\rm{da}}{{\rm{m}}^2} + 16{{\rm{m}}^2} = 2{\rm{da}}{{\rm{m}}^2} + 16:100{\rm{da}}{{\rm{m}}^2}$

$= 2{\rm{da}}{{\rm{m}}^2} + 0{,}16{\rm{da}}{{\rm{m}}^2} = 2{,}16{\rm{da}}{{\rm{m}}^2}$

Vậy $2{\rm{da}}{{\rm{m}}^2}16{{\rm{m}}^2} = 2{,}16{\rm{da}}{{\rm{m}}^2}$

Tương tự có:

- $8{\rm{da}}{{\rm{m}}^2}62{{\rm{m}}^2} = 8{,}62{\rm{da}}{{\rm{m}}^2}$

- $52{\rm{da}}{{\rm{m}}^2}40{{\rm{m}}^2} = 52{,}4{\rm{da}}{{\rm{m}}^2}$

- $46{\rm{da}}{{\rm{m}}^2}5{{\rm{m}}^2} = 46{,}05{\rm{da}}{{\rm{m}}^2}$

- $16{\rm{da}}{{\rm{m}}^2}29{{\rm{m}}^2} = 16{,}29{\rm{da}}{{\rm{m}}^2}$

- $32{\rm{da}}{{\rm{m}}^2}9{{\rm{m}}^2} = 32{,}09{\rm{da}}{{\rm{m}}^2}$

- $3{\rm{k}}{{\rm{m}}^2}4{\rm{c}}{{\rm{m}}^2} = 3{\rm{k}}{{\rm{m}}^2} + 4{\rm{c}}{{\rm{m}}^2} = 3 \times 10000{\rm{da}}{{\rm{m}}^2} + 4:1000000{\rm{da}}{{\rm{m}}^2}$

$= 30000{\rm{da}}{{\rm{m}}^2} + 0{,}000004{\rm{da}}{{\rm{m}}^2} = 30000{,}000004{\rm{da}}{{\rm{m}}^2}$

- $13{\rm{ h}}{{\rm{m}}^2}24{\rm{d}}{{\rm{m}}^2} = 13 \times 100{\rm{da}}{{\rm{m}}^2} + 24:10000{\rm{da}}{{\rm{m}}^2}$

$= 1300{\rm{da}}{{\rm{m}}^2} + 0{,}0024{\rm{da}}{{\rm{m}}^2} = 1300{,}0024{\rm{da}}{{\rm{m}}^2}$.