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

Toán Lớp 7: 3.(4-x)-2.(x-1)=x+20 giúp mk vs

Toán Lớp 7: 3.(4-x)-2.(x-1)=x+20 giúp mk vs

Comments ( 2 )

  1. 3.(4-x)-2.(x-1)=x+20
    ⇔12-3x-2x+2=x+20
    ⇔-3x-2x-x=20-2-12
    ⇔-6x=6
    ⇔x=-1
    Vậy x=-1
     

  2.  
    Lời giải và giải thích chi tiết:
    3.(4-x)-2.(x-1)=x+20
    12-3x-2x +2=x+20
    12 +2 – 20 = 3x + 2x +x    
    -6                = 6x
    -1                 = x

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