(1/x)+(1/y)=5,求分式(3x+4xy-3y)/(2x-3xy-2y)的值

已知1/x-1/y=5,求分式2x+5xy-2y/3x-xy-3y 已知1/x-1/y=5、求分式3x+5xy-3y/y-xy-x的值 若x：y：z=1:3:5,求分式x+3y-z/x-3y+z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1/x-1/y=5,求分式3x+5xy+3y/x-3xy-y的值；2.已知x+1/x=3,求分式x²+1/x²的值. 急,几道分式计算题分子和分母的最高次项的数为正数 -x²-2x-1/5+4x-3x²已知1/x-1/y=5,求分式3x+5xy-3y/x-3xy-y的值已知x+1/x=3,求分式x²+1/x²的值 1 已知x+1/x=3,求分式x²+1/x²的值 2 已知1/x-1/y=5,求分式xy/y-x的值 已知1/x-1/y=2001,求分式x-xy-y/x-y的值 解分式方程：10/(x+y)+3/(x-y)=-5,15/(x+y)-2/(x-y)=-1 3/(X-Y)+10/(X+Y)=-5 2/(X-Y)-15/(X+Y)=1 解分式方程组 已知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3x-xy+3y/x+xy+y的值. 已知,1/x+1/y=5.,求分式3x+xy+3y/x-2xy+y的值 已知1/x-1/y=3,求分式(2x+3xy-2y)/(x-2xy-y) 1/x+1/y=3.求分式3x-2xy+3y/x+xy+y的值 分式题求值1/x-1/y=2 求3x+xy-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