已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.要过程阿已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值.要讲解阿

【数学】已知 1/x-1/y=3 求 5x-xy-5y / x-2xy-y=?已知 1/x=1/y 求 2x-3xy-2y / x-2xy-y=? 已知1/x-1/x=3,求x-xy-y分之5x+xy-5y的值如题 已知1/x+1/y=1/2,求代数式3x-5xy+3y/-x+3xy-y 已知1/x-1/y=5,求3x+5xy-3y/x-3xy-y的值 已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y 已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值. 已知1/x+1/y=3,求(3x-5xy+3y)/(x-2xy+y) 已知1/x-1/y=3,求3x-5xy-3y/x-2xy-y的值. 已知1/x+1/y=3,求3x-2xy+3y/x+5xy+y的值 已知1/x-1/y=3,求5x+3xy-5y/x-2xy-y的值 已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值 已知1/x+1/y=5,求(3x-5xy+3y)/(x+xy+y)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 已知1/x-1/y=3,求5x+3xy-5y/x-2xy-y的值. 已知1/x-1/y=3,求5x+3xy-5y/x-2xy-y的值 已知1/X-1/y=3,求(5x+3xy-5y)/(x-2xy-y)的值 已知1/x-1/y=2,求3x+5xy-3y/x-xy-y