已知1/y-1/x=3,求2x+3xy-2y/x-2xy-y的值

已知1/y-1/x=3,求2x+3xy-2y/x-2xy-y的值
已知1/y-1/x=3,求2x+3xy-2y/x-2xy-y的值

已知1/y-1/x=3,求2x+3xy-2y/x-2xy-y的值
∵1/y-1/x=3
∴（x-y)/xy=3,x-y=3xy
2x+3xy-2y/x-2xy-y=2(x-y)+3xy/(x-y)-2xy=2×3xy+3xy/3xy-2xy=9xy/xy=9

给分子分母都除以xy就可以做了 相信自己吧 答案最后为9 不会的再联系我

1/y-1/x=3
x-y=3xy
2x+3xy-2y/x-2xy-y
2x+x-y-2y/x-y-2xy
3x-3y/3xy-2xy
3(x-y)/xy
9