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已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
人气:489 ℃ 时间:2019-10-11 12:52:54
解答
(5x-xy+5y)/(3xy-x-y)=[5(x+y)-xy]/[3xy-(x+y)]
=[5(x+y)-2(x+y)]/[6(x+y)-(x+y)]
=1/2
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