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

Toán Lớp 6: a.96 – 3.(x+1) = 42 b.2 x + 14 = 30

Toán Lớp 6: a.96 – 3.(x+1) = 42
b.2 x + 14 = 30

Comments ( 2 )

  1. a.96 – 3.(x+1) = 42
               3.(x+1) = 96 – 42
               3.(x+1) = 54
                   x+1  = 54 : 3 
                   x+1  = 18
                   x  = 18 – 1
                   x  = 17
    b.2 x + 14 = 30
       2 x         = 30 – 14
       2 x         =   16
          x         =   16 : 2
          x         =      8

  2. a)96-3.(x+1)=42
    3.(x+1)=96-42
    3.(x+1)=54
    x+1=54:3
    x+1=18
    x=18-1
    x=17
    b)2x+14=30
    2x=30-14
    2x=16
    x=16:2
    x=8

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