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

Toán Lớp 5: Câu 1 : Đặt tính rồi tính a) 3/5+2/7 = b) 3/7÷5/6 =

Toán Lớp 5: Câu 1 : Đặt tính rồi tính
a) 3/5+2/7 =
b) 3/7÷5/6 =

Comments ( 2 )

  1. a) $\dfrac{3}{5}$ + $\dfrac{2}{7}$ = $\dfrac{21}{35}$ + $\dfrac{10}{35}$ = $\dfrac{31}{35}$.
    b)$\dfrac{3}{7}$ ÷ $\dfrac{5}{6}$ = $\dfrac{3}{7}$ x $\dfrac{6}{5}$ = $\dfrac{18}{35}$ 
    \text{#black} 

  2. Câu 1:
    a) 3/5 + 2/7
    = (3xx7)/(5xx7) + (2xx5)/(7xx5)
    = 21/35 + 10/35
    = (21 + 10)/35
    = 31/35
    b) 3/7 : 5/6
    = 3/7 xx 6/5
    = (3xx6)/(7xx5)
    = 18/35

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

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