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

Toán Lớp 8: 3x+5=5x-7 giúp tui với nha (p≧w≦q)

Toán Lớp 8: 3x+5=5x-7
giúp tui với nha (p≧w≦q)

Comments ( 2 )

  1. 3x+5=5x-7
    3x-5x = -7-5
    -2x = -12
    x= -12 : (-2)
    x= 6
     

  2. 3x+5=5x-7⇔3x+5-5x+7=0
    ⇔12-2x=0⇔-2x=12
    ⇔x=-6
     

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

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