已知X=2005,Y=2004,则(X+Y)(XX+YY)/XXXX+YYYY=
已知xx+yy+4x-6y+13=0,求(xx-2x)/xx+3yy的值.
((xx+yy)/y-2y)/(1/y-1/x)^(1/(xx-yy))
xx-yy-x-y 因式分解
已知2x=3y,求xy/xx+yy-yy/xx-yy的值
(x-y)(x+y)(xx-yy)=?
XX-YY/(X-Y)(X-Y)约分
x y x+yy x+y xx+y x y
已知XX+YY+4X-6Y+13=0,则X的Y次方是
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
已知(x+y)(x+y)=25,(x-y)(x-y)=9求xy与xx+yy的值
已知14(XX+YY+ZZ)=(X+2Y+3Z)^2,求X:Y:Z