X-Y=4,xy=12则xx+YY的值

已知2x=3y,求xy/xx+yy-yy/xx-yy的值 X-Y=4,xy=12则xx+YY的值 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 x-y/x+y=2,则xx+2xy+yy/4xy=? 若xx+yy-2x-6y+10=0,求分式（xx-yy）/xy的值. 若x-y=4,求(xx+yy)÷2-xy的值 若x-y=4,求(xx+yy)÷2-xy的值 x-y=3,(x+y)(x+y)=25,求xy/xx+yy的值? 若x/3=y/4=z/5,则(xy+yz=xz)/(xx+yy+zz)的值为 已知x,y是实数,且适合方程(xx+xy-12)(xx+xy-12)+(xy-2yy-1)(xy-2yy-1)=0求x,y的值 已知xx+yy+4x-6y+13=0,求（xx-2x）/xx+3yy的值. 已知x-y=5,y-z=4,求xx+yy+zz-xy-yz-xz的值 已知(x+y)(x+y)=25,(x-y)(x-y)=9求xy与xx+yy的值 已知xx+yy=7,xy=-2,求多项式5xx-3xy-4yy-11xy-7xx+2yy的值. 已知xx+xy=1,xy-yy=-4,则xx+2xy-yy= xx+2x+yy+6y+10=0求xx+yy的值 x,+y=5 xy=3 求xx+yy