已知1⼀x-1⼀y=5,求分式3x+5xy-3y⼀x-3xy-y的值。

2024-12-20 15:59:42
推荐回答(1个)
回答1:

1/x-1/y=5
(y-x)/xy=5
y-x=5xy
x-y=-5xy

3x+5xy-3y/x-3xy-y
=3(x-y)+5xy/(x-y)-3xy
=3*(-5xy)+5xy/-5xy-3xy
=-10xy/-8xy
=5/4