已知x-y=1,xy=2,求x^5y^3-2x^4y^4+x^3y^5

【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x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y 已知1/x-1/y=5,求分式2x+5xy-2y/3x-xy-3y 已知1/x+1/y=1/2,求代数式3x-5xy+3y/-x+3xy-y 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=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5x+3xy-5y/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-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=5 求2x-3xy+2y/x+2xy+y 已知1/x-1/y=2,求x-y-5xy/2x-2y+3xy 已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值如题.