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

Toán Lớp 5: tính bằng 2 cách 7/11 : 3/5 + 4/11 : 3/5

Toán Lớp 5: tính bằng 2 cách 7/11 : 3/5 + 4/11 : 3/5

Comments ( 2 )

  1. $\text{Cách 1:$\frac{7}{11}$ : $\frac{3}{5}$ + $\frac{4}{11}$ : $\frac{3}{5}$ }$
    $\text{= $\frac{35}{33}$ + $\frac{20}{33}$ }$
    $\text{= $\frac{5}{3}$ }$
    $\text{Cách 2:$\frac{7}{11}$ : $\frac{3}{5}$ + $\frac{4}{11}$ : $\frac{3}{5}$ }$
    $\text{= ($\frac{7}{11}$ + $\frac{4}{11}$) : $\frac{3}{5}$ }$
    $\text{= 1 : $\frac{3}{5}$}$
    $\text{= $\frac{5}{3}$}$

  2. text{Cách 1}
    7/11 : 3/5 + 4/11 : 3/5
    = ( 7/11 + 4/11 ) : 3/5
    = 11/11 : 3/5
    = 1 × 5/3
    = 5/3
    text{Cách 2}
    7/11 : 3/5 + 4/11 : 3/5
    = 7/11 × 5/3 + 4/11 × 5/3
    = 35/33 + 20/33
    = 55/33 = 5/3
    #dtkc
     

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

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