若1⼀x+1⼀y=2,则分式(2x+3xy+2y)⼀(x-xy+y)的值是________。

2024-12-20 16:01:54
推荐回答(2个)
回答1:

分式(2x+3xy+2y)/(x-xy+y)的分子和分母同时除以xy得:
(2/y +3+ 2/x)/(1/y -1+ 1/x)
=[2(1/x + 1/y)+3]/[(1/x + 1/y)-1]
=[2*2+3]/[2-1]
=7

回答2:

(x+y)/xy=2
x+y=2xy
(2x+3xy+2y)/(x-xy+y)
=(4xy+3xy)/(2xy-xy)
=7xy/xy
=7