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数学
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已知1/x+1/y=5,求分式2x-3xy+2y/x+2xy+y的值
人气:411 ℃ 时间:2019-09-20 13:14:31
解答
1/x+1/y=5
y+x=5xy
x+y=5xy
所以
2x-3xy+2y/x+2xy+y
=[2(x+y)-3xy]/[(x+y)+2xy]
=(2*5xy-3xy)/(5xy+2xy)
=7xy/7xy
=1
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