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数学
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因式分解x3-x2-x-1
人气:144 ℃ 时间:2020-04-05 02:41:20
解答
x³-x²-x-1
=(x³-x)-(x+1)
=x(x²-1)-(x+1)
=x(x+1)(x-1)-(x+1)
=(x²-x-1)(x+1)
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