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1/1+x+2x/1-x²等于
人气:122 ℃ 时间:2020-02-06 04:45:31
解答
1/1+x+2x/1-x²
=(x-1)/(x²-1)-2x/(x²-1)
=(x-1-2x)/(x+1)(x-1)
=-(x+1)/(x+1)(x-1)
=1/(1-x)
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