若2x=-y,则分式xy/x2-y2
若x<y<0,则x2−2xy+y2+x2+2xy+y2=( )
已知x2+y2-2x-4y+5=0,分式yx−xy
已知x+2y=0(x不等于0)求分式2xy+y2/x2-xy
若实数X,Y,满x2+xy+y2=3,则x2+y2的取值范围
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知x+y=2,x-y=12,则分式2x2-2y2x2+2xy+y2的值是 ___ .
若x2次方+y2次方+4x—8y+20=0,求分式xy分之x2次方—y2次方大神们帮帮忙
若实数XY满足X2+Y2=1,则X-2Y的最大值为
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知x:Y:z=1:2:3则分式x2+y2+z2除以2xy+3yz-4xz的值是
已知x2-4xy+4y2=0,那么分式x-yx+y