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数学
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x+1- (x^2+2x)/(x+1)=
人气:214 ℃ 时间:2020-05-12 13:00:27
解答
x+1- (x^2+2x)/(x+1)=[x²+2x+1-x²-2x)/(x+1)=1/(x+1)
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