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

Toán Lớp 8: (x ² -2x + 1)(x-1) Giúp mình với ạ^^

Toán Lớp 8: (x ² -2x + 1)(x-1)
Giúp mình với ạ^^

Comments ( 2 )

  1. (x^2-2x+1)(x-1)
    =(x-1)^2(x-1)
    =(x-1)^3
    =x^3-3x^2+3x-1

  2. $(x^{2}-2x+1)(x-1)$
    $=(x-1).x^2-2x(x-1)+1(x-1)$
    $=x^3-x^2-2x^2+2x+1(x-1)$
    $=x^3-3x^2+2x+x-1$
    $=x^3-3x^2+3x-1$

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

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