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

Toán Lớp 8: (x+3)(x ²-3x+9)-x(x-1)(x+1)=14

Toán Lớp 8: (x+3)(x ²-3x+9)-x(x-1)(x+1)=14

Comments ( 2 )

  1. (x+3)(x^2-3x+9)-x(x-1)(x+1)=14
    ⇔x^3+3^3-x(x^2-1)=14
    ⇔x^3+27-x^3+x=14
    ⇔(x^3-x^3)+x+27=14
    ⇔x=14-27=-13

  2. (x+3) (x^2-3x+9) – x (x-1) (x+1) = 14
    ⇔ x^3 + 27 – x (x^2-1) = 14
    ⇔ x^3 + 27 – x^3 + x = 14
    ⇔ x + 27 = 14
    ⇔ x = -13
     

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