X-Y=5,XY=3.XY是多少?

X-Y=5,XY=3.XY是多少? xy+yx=10x,y是多少 XY+Y=YX 问：XY是多少 已知x-y=4,xy=－2,则代数式(3x-4y+5xy)-(2x-3y-2xy)的值是多少 X+y=3 xy=-5 Xy=? 2y+3x=2XY（X>0,Y>0)的XY的最小值是多少 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,求式子3(x^-xy)-xy+y^的值 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x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y= 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=