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数学
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先化简再求值:(x+2/x²-2x - x-1/x²-4x+4)÷ x-4/x,其中x=3/2
人气:402 ℃ 时间:2020-01-26 04:29:10
解答
(x+2/x²-2x - x-1/x²-4x+4)÷ x-4/x
={(x+2)(x-2)/[x(x-2)²]-x(x-1)/[x(x-2)²] } ·x/(x-4)
={(x²-4-x²+x)/[x(x-2)²] } ·x/(x-4)
=(x-4)/[x(x-2)²] ·x/(x-4)
=1/(x-2)²
=1/(3/2-2)²
=1/(-1/2)²
=4您好,我的答案与您的一样,可答案上写的是1/4,是答案有误,对吗?O(∩_∩)O谢谢答案错了1÷4分之1=4
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