xx+12*12=yy(y-x=2)
已知2x=3y,求xy/xx+yy-yy/xx-yy的值
(x-y)(x+y)(xx-yy)=?
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,
已知xx+yy+4x-6y+13=0,求(xx-2x)/xx+3yy的值.
已知x-y=2,(xx)-(yy)=12,求x与y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=4,xy=12则xx+YY的值
已知14(XX+YY+ZZ)=(X+2Y+3Z)^2,求X:Y:Z
已知 xx-2x+yy+6y+10=0 求x+y的值
((xx+yy)/y-2y)/(1/y-1/x)^(1/(xx-yy))
已知XX+YY=7 XY=-2 X= Y=?