已知1/x-1/2y=1/3,求分式(2x+3xy-4y)/(x-3xy-2y)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 解一道分式题已知1/x-1/y=3 求分式(4x-5xy-4y)/(3x-2xy-3y)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 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 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+3xy-3y求分式(3x+3xy-3y)/(x-2xy-y)的值~ 已知1／x-1/y=3,求分式(2x-14y-2y)/(x-2xy-y)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 已知1/x-1/2y=1/3,求分式(2x+3xy-4y)/(x-3xy-2y)的值 已知1/x-1/y=3,求分式2x+3xy-2y/x-2xy-y的值 已知x分之1- y分之1=3 ,求分式 x-2xy-y分之2x+3xy-2y的值. 已知1/x+1/y=2,求分式3x+7xy+3y/2x-5xy+2y的值 已知1除X-1除Y=3,求分式2X+3XY-2Y/X-2XY-Y