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

Toán Lớp 7: 3/5.x+1/2=1/5 Giúp em nhanh với ạ

Toán Lớp 7: 3/5.x+1/2=1/5
Giúp em nhanh với ạ

Comments ( 2 )

  1. $\dfrac{3}{5}$ . x + $\dfrac{1}{2}$ = $\dfrac{1}{5}$
    $\dfrac{3}{5}$ . x                            = $\dfrac{1}{5}$ – $\dfrac{1}{2}$
    $\dfrac{3}{5}$ . x                            = $\dfrac{-3}{10}$
                             x                            = $\dfrac{-3}{10}$ : $\dfrac{3}{5}$ = $\dfrac{-3}{10}$ . $\dfrac{5}{3}$
                            x                             = $\dfrac{-15}{30}$ = $\dfrac{-1}{2}$ 
     

  2. 3/5.x+1/2=1/5
    3/5.x        =1/5-1/2
    3/5.x        =-3/10
          x        =-3/10:3/5
          x        =-1/2
      Vậy x=-1/2
     

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

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