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

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

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

Comments ( 2 )

  1.    (x-1)³- 4x(x+1)(x-1)-3(x-1)(x²+x+1)
    = x³-3x²1+3×1²-1³-4x(x²-1)-3(x³-1)
    = x³-3x²+3x-1-4x³+4x-3x³+3
    = (x³-4x³-3x³)-3x²+(3x+4x)-(1-3)
    = -6x³-3x²+7x+2
    #CHÚC BẠN HỌC TỐT!
     

  2. (x-1)^3 – 4x(x+1)(x-1)-3(x-1)(x^2+x+1)
    =(x-1)^3-4x(x^2-1)-3(x^3-1)
    =x^3-3.x^2+3.x-1-4x^3+4x-3x^3+3
    =-6x^3-3x^2+7x+2
    Cho mk xin hay nhất please
    Thank you

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