((xx+yy)/y-2y)/(1/y-1/x)^(1/(xx-yy))
((xx+yy)/y-2y)/(1/y-1/x)^(1/(xx-yy))
已知xx+yy+4x-6y+13=0,求(xx-2x)/xx+3yy的值.
xx-yy-x-y 因式分解
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
如果实数X,Y满足XX+YY=1,求(1+XY)(1-XY)的最大值和最小值
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,
x y x+yy x+y xx+y x y
已知x=1/2 y=1/3 z=1/4 则(xx+yy-zz+2xy)/(xx-yy+zz-2xz) 得多少?