化简(X-5)*(Y+2)=XY

化简(X-5)*(Y+2)=XY 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]} 2xy+5y^2+( )=x^2+3xy 5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y（化简） 已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2 4xy-[(x²+5xy-y²)-(x²+3xy-2y²)],其中x=2,y=-1求值，化简 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) 已知xy^2=-2xy(x^2y^5-xy^3-y) xy^2=-3,求-xy(x^2y^5-xy^3-y) 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 已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y) 已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y=