x-3xy=—5,xy+y=3,求x-2xy+y的值

已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 已知x—xy=5,xy—y=-3,求x+y—2xy的值. x-3xy=—5,xy+y=3,求x-2xy+y的值 xy^2=-3,求-xy(x^2y^5-xy^3-y) 已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值. 已知xy^2=-2 求-xy(x^2y^5-xy^3-y) 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 已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y 已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y) 已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y 已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值 已知xy=2(x+y),求5x-xy+5y/3xy-x-y的值 已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值