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

Toán Lớp 6: 1) 45+x=-20 2) 5.x=-75 3)10-4x=-3.10 4) (-3x-5) +2^2= 2^3

Toán Lớp 6: 1) 45+x=-20
2) 5.x=-75
3)10-4x=-3.10
4) (-3x-5) +2^2= 2^3

Comments ( 2 )

  1. 1)45+x=-20
    x=-20-45
    x=-65
    2)5.x=-75
    x=-75:5
    x=-15
    3)10-4x=-3.10
    10-4x=-30
    -4x=-30-10
    -4x=-40
    x=-40:(-4)
    x=10
    4)(-3x-5)+2^2=2^3
    (-3x-5)+4=8
    -3x-5=8-4
    -3x-5=4
    -3x=4+5
    -3x=9
    x=9:(-3)
    x=-3

  2. @Bao
    45+x=-20
    ->x=-20-45
    ->x=-65
    5.x=-75
    ->x=-75:5=-15
    10-4x=-3.10
    ->10-4x=-30
    ->-4x=-30-10=-40
    ->x=-40/-4=10
    (-3x-5)+2^2=2^3
    ->-3x-5=2^3-2^2=4
    ->-3x=4+5=9
    ->x=9/-3=-3

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