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分解因式:x的3次方减2x加1
人气:113 ℃ 时间:2020-01-27 02:23:17
解答
x的3次方减2x加1
=x³-x-(x-1)
=x(x²-1)-(x-1)
=x(x+1)(x-1)-(x-1)
=(x²+x)(x-1)-(x-1)
=(x-1)(x²+x-1)
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