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x的立方/x-1 -x的平方 -x -1怎么算
人气:418 ℃ 时间:2019-10-19 10:12:42
解答
=x³/(x-1)-(x²+x+1)
=x³/(x-1)-(x-1)(x²+x+1)/(x-1)
=x³/(x-1)-(x³-1)/(x-1)
=1/(x-1)
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