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(x+1减1-x分之1)除以(x减x-1分之x的平方)
人气:195 ℃ 时间:2020-01-25 21:34:13
解答
(x+1-1/(1-X))/(X-X^2/(X-1))
=(-X^2/(1-X))/(-X/(X-1))
=X
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