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

Toán Lớp 6: giải giúp mình -12+3(-x=7)=-18

Toán Lớp 6: giải giúp mình -12+3(-x=7)=-18

Comments ( 2 )

  1. -12 + 3 ( -x + 7 ) = -18
    ⇔ -12 – 3x + 21 = -18
    ⇔ -3x = -18 + 12 – 21
    ⇔ -3x = -27
    ⇔ x = -27 : ( – 3 ) = 9
    Vậy x=9

  2. -12+3(-x+7)=-18
    3(-x+7)=-18-(-12)
    3(-x+7)=-18+12
    3(-x+7)=-6
    -x+7=(-6):3
    -x+7=-2
    -x=-2-7
    -x=-9
    =>x=9

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

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