x-y/x+y=2,则xx+2xy+yy/4xy=?

已知2x=3y,求xy/xx+yy-yy/xx-yy的值 x-y/x+y=2,则xx+2xy+yy/4xy=? 已知x(x-1)-(xx-y)=-3求xx+yy-2xy 已知x（x+1)-(xx+y)=3,求(xx+yy)/2-xy的值 x(x+1)-(xx+y)=-3,求(xx+yy)/2-xy的值 因式分解：xx-2x-2yy+4y-xy 分解因式：x-y-xx+2xy-yy+2 xx-2xy+yy+4x-4y+4 xx+4xy+yy-2x-4y+6 因式分解 若xx+yy=2,x+y=1则xy=? 若xx+yy-2x-6y+10=0,求分式（xx-yy）/xy的值. 已知XX+YY=7 XY=-2 X= Y=? help me:分解因式：x-y-xx+2xy-yy+2=0 若x-y=4,求(xx+yy)÷2-xy的值 若x-y=4,求(xx+yy)÷2-xy的值 x,+y=5 xy=3 求xx+yy (x-y)(x+y)(xx-yy)=? [2x-(x+y)(x-y)](yy-xx)