2x-3y=5x+2y=1 求xy的值

若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 1/x+1/y=2,求2x-xy+2y/3x+5xy+3y的值 已知:1/X+1/Y=5,求 2x-3xy+2y/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=3,求3x-5xy-3y/x-2xy-y的值. 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 1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值 若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值 xy/x+y=2 求3x-5xy+3y/-x+3xy-y的值? 若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值