已知1/x+1/y=3,则分式2x+3xy+2y/x-2xy+y的值为
1个回答
1/x+1/y=(x+y)/xy=3 即 x+y=3xy
(2x+3xy+2y)/(x-2xy+y)=(2*3xy+3xy)/(3xy-2xy)=9xy/xy=9
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