已知：x+y=-2,xy=3.求:2(xy-3x)-3((2y-xy)的值

已知x(x-1)-(x^2-y)=-3.求x^2+y^2-2xy 已知x-xy=8,xy-y=-9,求x+y-2xy的值 已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy 已知：x+y=-2,xy=3.求:2(xy-3x)-3((2y-xy)的值 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. 已知X+y=6,xy=7 求x^2y+xy^2=已知X+y=6,xy=7 x^2y+xy^2 已知y=3xy+x,求代数式2x+3xy-2y/x-2xy-y的值 已知x+y=3xy,求2x+2y-xy/x+y+2xy的值、 已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值. 已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y) 已知x-y=3xy,求2x+3xy-2y/x-2xy-y 已知x-y=4xy,求2x+3xy-2y/x-2xy-y的值 已知x-y=xy,求(2x-xy-2y)/(x-2xy-y)的值 已知x-y=3xy,求2x-3xy-2y/x-2xy-y 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值! 已知y=3xy+x,求代数式2x+3xy-2y/x-2xy-y的值 已知xy-x-y=11,求(xy-1)^2+(x+y-2)(x+y-2xy)的值.