若xx+yy=2,x+y=1则xy=?
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已知2x=3y,求xy/xx+yy-yy/xx-yy的值
若xx+yy=2,x+y=1则xy=?
xx+2xy+yy=1 xx-2xy+yy=49 求xx+yy,xy.
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
已知xx+xy=1,xy-yy=-4,则xx+2xy-yy=
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=-1,xy=5,则xx+yy=
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
xy=9,x-y=-3,则xx+3xy+yy等于多少
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
如果实数x,y满足xx+yy=1,则(1+xy)(1-xy)的最大值和最小值
(x-y)(x+y)(xx-yy)=?
已知XX+YY=7 XY=-2 X= Y=?