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

Toán Lớp 7: help a , ( – 12 ) . x = ( – 15 ) . ( – 4 ) – 12 b , ( – 5 ) + 5 = ( – 3 ) . ( – 8 ) + 6 c , 3x + 36 = – 7x – 64 d , – 5x – 178 = 14x +

Toán Lớp 7: help
a , ( – 12 ) . x = ( – 15 ) . ( – 4 ) – 12
b , ( – 5 ) + 5 = ( – 3 ) . ( – 8 ) + 6
c , 3x + 36 = – 7x – 64
d , – 5x – 178 = 14x + 145

Comments ( 2 )

  1. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-7-help-a-12-15-4-12-b-5-5-3-8-6-c-3-36-7-64-d-5-178-14

  2. Lời giải chi tiết:
    a) (-12).x=(-15).(-4)-12
    =>(-12).x=60-12
    =>(-12).x=48
    =>x=48:(-12)
    =>x=-4
    Vậy x=-4
    b) (-5).x+5=(-3).(-8)+6
    =>(-5).x+5=30
    =>(-5).x=30-5
    =>(-5).x=25
    =>x=25:(-5)
    =>x=-5
    Vậy x=-5
    c) 3x+36=-7x-64
    =>3x-(-7)=-64-36
    =>10x=-100
    =>x=-100:10
    =>x=-10
    Vậy x=-10
    d) -5x-178=14x+145
    =>14x-(-5x)=-178-145
    =>19x=-323
    =>x=-323:19
    =>x=-17
    Vậy x=-17
    @uniquetimehunter

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

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