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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 4: 3/4 dm2==.cm2 1/4×5/12+5/12×4/5=

Toán Lớp 4: 3/4 dm2=………….cm2
1/4×5/12+5/12×4/5=

Comments ( 2 )

  1. 3/4  dm^2 = 75  cm^2
    ->  1  dm^2 = 100  cm^2
    -> 3/4  dm^2 = 100 xx 3/4 = 75  cm^2
    $\\$
    1/4 × 5/12 + 5/12 × 4/5
    = (1/4 + 4/5) × 5/12
    = 21/20 xx 5/12
    = 21/48
    = 7/16

  2. $\text{Giải đáp+Lời giải và giải thích chi tiết:}$
    Vì $1dm²=$ $100cm²$
    $⇒ 3/4 dm²$ $=75cm²$
    b) $\frac{1}{4}$ . $\frac{5}{12}$ + $\frac{5}{12}$. $\frac{4}{5}$
    = $\frac{5}{12}$.($\frac{1}{4}$+$\frac{4}{5}$)
    = $\frac{5}{12}$.($\frac{5}{20}$+$\frac{16}{20}$)
    = $\frac{5}{12}$.$\frac{21}{20}$
    = $\frac{7}{16}$
     

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222-9+11+12:2*14+14 = ? ( )

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