若x-y/x+y=2,则x2+2xy+y2/4xy=多少
已知x+y=4,xy=2,则x2+y2+3xy=______.
若x<y<0,则x2−2xy+y2+x2+2xy+y2=( )
已知x2+4y2+x2y2-6xy+1=0,求 x4-y4/2x-y 乘 2xy-y2/xy-y2 除以(x2+y2/x
已知2x-3*根号(xy)-2y=0(x>0),则x2+4xy-16y2除以2x2+xy-9y2的值是多少?
正数xy满足x2-y2=2xy,求x+y分之x-y的值
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
已知x+y=4,xy=2,求x2+y2+3xy的值.
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
设x,y为实数,若4x2+y2+xy=1,则2x+y的最大值是( )
若x2-2xy-y2-x+Y-1=0 求x-y的值
正整数x,y满足x2-y2=2xy,求x-y/x+y的值
整数x,y满足x2-y2=2xy,求x-y/x+y的值