x-1的五次方怎么算
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(x-1)^5=(x-1)^2*(x-1)^2*(x-1)=(x^2-2x+1)(x^2-2x+1)(x-1)
=(x^3-2x^2+x-x^2+2x-1)(x^2-2x+1)
=(x^3-3x^2+3x-1)(x^2-2x+1)
=x^5-3x^4+3x^3-x^2-2x^4+6x^3-6x^2+2x+x^3-3x^2+3x-1
合并同类项可得
=x^5-5x^4+10x^3-10x^2+5x-1
=(x^3-2x^2+x-x^2+2x-1)(x^2-2x+1)
=(x^3-3x^2+3x-1)(x^2-2x+1)
=x^5-3x^4+3x^3-x^2-2x^4+6x^3-6x^2+2x+x^3-3x^2+3x-1
合并同类项可得
=x^5-5x^4+10x^3-10x^2+5x-1
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