x的3次方-x的2次方-x+1
问题描述：
x的3次方-x的2次方-x+1
因式分解
答
x³-x²-x+1
= x²(x-1)-(x-1)
= (x-1)(x²-1)
= (x-1)(x+1)(x-1)
= (x-1)²(x+1)
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