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

Toán Lớp 8: 2x(x^2+1)-x^2(x+2)-x^3+2x^2+4=0

Toán Lớp 8: 2x(x^2+1)-x^2(x+2)-x^3+2x^2+4=0

Comments ( 2 )

  1. #tnvt
    2x(x^2+1)-x^2(x+2)-x^3+2x^2+4=0
    <=>2x^3+2x-x^3-2x^2-x^3+2x^2+4=0
    <=>2x=-4
    <=>x=-2
    Vậy x=-2
     

  2. 2x(x^2+1)-x^2(x+2)-x^3+2x^2+4=0
    ⇔2x^3-2x-x^3-2x^2-x^3+2x^2=0
    ⇔2x+4=0
    ⇔2x=-4
    ⇔x=-2
    Vậy S={-2}
     

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

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