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数学
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设f(x)=x-1/(x+1),则f(x)+f(1/x)=?
我化简f(1/x)然后到分母里也有分数.就不会化简了.这样类型的应该怎么化简啊?
(1/x-1)/(1/x+1)=(1-x)/(1+x) ..这步是怎么化出来的啊.
人气:302 ℃ 时间:2020-04-16 01:07:23
解答
f(1/x)=(1/x-1)/(1/x+1)=(1-x)/(1+x)
f(x)+f(1/x)=(x-1)/(x+1)+(1-x)/(1+x)=0
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