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

Toán Lớp 7: 1 phần 7x – 5 phần 7 = -1 phần 3

Toán Lớp 7: 1 phần 7x – 5 phần 7 = -1 phần 3

Comments ( 2 )

  1. $\text{# Chớp#}$
    $\text{$\dfrac{1}{7}$. x – $\dfrac{5}{7}$= $\dfrac{-1}{3}$}$
    $\text{$\dfrac{1}{7}$ . x = $\dfrac{-1}{3}$ + $\dfrac{5}{7}$  }$
    $\text{$\dfrac{1}{7}$ . x =$\dfrac{8 }{21 }$ }$
    $\text{x =$\dfrac{8}{21}$  :$\dfrac{1}{7}$ }$
    $\text{x = $\dfrac{8}{3}$}$

  2. 1/7 . x – 5/7 = -1/3
    => 1/7 . x = -1/3 + 5/7
    => 1/7 . x = 8/21
    => x = 8/21 : 1/7
    => x = 8/3
    Vậy : x = 8/3
     

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

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