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

Toán Lớp 5: 6 . Tính nhanh : a . 5/6 x 1/7 + 6/7 x 5/6

Toán Lớp 5: 6 . Tính nhanh :
a . 5/6 x 1/7 + 6/7 x 5/6

Comments ( 2 )

  1. $\text{#Chớp#}$
    $\text{a )$\dfrac{5 }{6}$ x $\dfrac{1}{7}$ +$\dfrac{6}{7}$ x  $\dfrac{5}{6}$}$
    $\text= $\dfrac{5 }{6}$ x ( $\dfrac{1 }{7}$ + $\dfrac{6 }{7}$}$
    $\text{=$\dfrac{5 }{6}$ x 1 }$
    $\text{= $\dfrac{5 }{6}$}$

  2. 5/6 xx 1/7 + 6/7 xx 5/6
    = 5/6 xx ( 1/7 + 6/7)
    = 5/6 xx 1
    = 5/6
    Áp dụng tính chất : a/b xx c/d + a/b xx e/f = a/b xx ( c/d + e/f)
     

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