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

Toán Lớp 8: (x-1)mũ3-(x+2)(x mũ2-2x+4)+3(x-1)(x+1)

Toán Lớp 8: (x-1)mũ3-(x+2)(x mũ2-2x+4)+3(x-1)(x+1)

Comments ( 2 )

  1. ***Lời giải***
    (x-1)^3-(x+2)(x^2-2x+4)+3(x-1)(x+1)
    =x^3-3x^2+3x-1-(x^3+8)+3(x^2-1)
    =x^3-3x^2+3x-1-x^3-8+3x^2-3
    =(x^3-x^3)+(3x^2-3x^2)+3x+(-1-8-3)
    =3x-12

  2. (x-1)^3 – (x+2)(x^2-2x+4) + 3(x-1)(x+1)
    =(x^3-3x^2+3x-1)-(x^3+2^3)+3(x^2-1)
    =x^3-3x^2+3x-1 – x^3 – 8 + 3x^2 – 3
    =3x-12
    =3(x-4)
    ~~~~~~~~~~~GOOD LUCK~~~~~~~~~~~

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