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

Toán Lớp 8: cho A=x.(x+2)(x+3)+(x-2)(x^2+2x+4)-2x(x^2+x-2)

Toán Lớp 8: cho A=x.(x+2)(x+3)+(x-2)(x^2+2x+4)-2x(x^2+x-2)

Comments ( 1 )

  1. $ A=x.(x+2)(x+3)+(x-2)(x^2+2x+4)-2x(x^2+x-2) $
    =x(x^2+3x+2x+6)+x^3+2x^2+4x-2x^2-4x-8-2x^3-2x^2+4x
    =x^3+3x^2+2x^2+6x+x^3+2x^2+4x-2x^2-4x-8-2x^3-2x^2+4x
    =(x^3+x^3-2x^3)+(3x^2+2x^2+2x^2-2x^2-2x^2)+(6x+4x-4x+4x)+(-8)
    =3x^2+10x-8
    #tcv

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