1/x+1/y=3.求分式3x-2xy+3y/x+xy+y的值

1/x+1/y=3.求分式3x-2xy+3y/x+xy+y的值 已知1/x-1/y=3,求分式(2x+3xy-2y)/(x-2xy-y) 已知1/x-1/y=5,求分式2x+5xy-2y/3x-xy-3y 已知1/x+1/y=3,求分式3x-2xy+3y/x+xy+y的值 已知,1/x+1/y=5.,求分式3x+xy+3y/x-2xy+y的值 分式题求值1/x-1/y=2 求3x+xy-3y/y-xy-x的值 解一道分式题已知1/x-1/y=3 求分式(4x-5xy-4y)/(3x-2xy-3y)的值. 1.已知3/x=4/y,求分式x^2+2xy/3x^2-y^2的值.2.已知1/x-1/y=3,求分式3x+2xy-3y/x+xy-y的值.3.……（1）已知3/x=4/y,求分式x^2+2xy/3x^2-y^2的值.（2）已知1/x-1/y=3,求分式3x+2xy-3y/x+xy-y的值.（3）已知a/2=b/3=c/4,求分式3a 已知1/x-1/y=3,求分式3x-xy+3y/x+xy+y的值. 已知1/x-1/y=5、求分式3x+5xy-3y/y-xy-x的值 已知1/x-1/y=5,求分式y+xy-x/2x+7xy-2y的值. 已知1/x-1/y=5 求分式-x+xy+y/2x+7xy-2y 已知1/X-1/y=5,求分式(y+xy-x)/(2x+7xy-2y)的值 1若x+2y=0 ,xy不等于0,求分式 x^2+2xy / xy+y^2 已知1/x -1/y=3,求分式3x+3xy-3y求分式(3x+3xy-3y)/(x-2xy-y)的值~ 已知x-y=3xy,求分式3x+2xy-3y/x-2xy-y的值 若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值 若y-x/xy=3,求分式2x+3xy-2y/x-2xy-y