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

Toán Lớp 7: (2x -1)^3=-8 1 câu hoi nha ! ;-;

Toán Lớp 7: (2x -1)^3=-8
1 câu hoi nha ! ;-;

Comments ( 2 )

  1. (2x-1)^3=-8
    ⇔(2x-1)^3=(-2)^3
    ⇔2x-1=-2
    ⇔2x=-2+1
    ⇔2x=-1
    ⇔x=-1/2
    Vậy x=-1/2

  2. (2x-1)^{3}=-8
    =>(2x-1)^{3}=(-2)^3
    =>2x-1=-2
    =>2x=-2+1
    =>2x=1
    =>x=-1:2
    =>x=-1/2
    Vậy x=-1/2

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

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