已知(XX+YY—2)(XX+YY)=3,求XX+YY
已知(XX+YY—2)(XX+YY)=3,求XX+YY
已知2x=3y,求xy/xx+yy-yy/xx-yy的值
已知xx+yy+4x-6y+13=0,求(xx-2x)/xx+3yy的值.
xx:yy
已知:xx-xy=7,xy-yy=4,则xx-yy=( )
已知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=
((xx+yy)/y-2y)/(1/y-1/x)^(1/(xx-yy))
3xx+xy+yy=15
x(x+1)-(xx+y)=-3,求(xx+yy)/2-xy的值
已知14(XX+YY+ZZ)=(X+2Y+3Z)^2,求X:Y:Z
已知x-y=2,(xx)-(yy)=12,求x与y的值