若xy=-2,x+y=3,求x,y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 若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值 若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若x+y=4,x^3+y^3=(x+y)(x^2-xy+y^2)z,求x^3+12xy+y^3的值. 若x+y=4,x-y=6,求xy(y^2+y)-y^2(xy+2x)-3xy的值. 若1/x-1/y=3,求(2x+3xy-2y)/(x-2xy-y)的值 若1/x-1/y=3,求（2x-3xy-2y)/(x-2xy-y)的值 若(1/x )-(1/y)=3,求(3x+4xy-3y)/(x-2xy-y)的值. 若1/X-1/Y=2,求3X+XY+3Y/X-XY-Y的值 若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值 若x+y=4 x-y=6 求xy(x^2+y)-y^2(xy+2x)-3xy的值求值 已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理. 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 已知xy/x+y=3,求2x-3xy+2y/-x+3xy-y的值 xy/x+y=3求2x-3xy+2y/3xy-x-y的值 已知xy/x+y=3,求2x-3xy+2y/-x+3xy-y的值