若2x2+2xy+y2-2x+1=0,则xy的值是______.
已知x、y是实数且满足x2+xy+y2-2=0,设M=x2-xy+y2,则M的取值范围是______.
已知x2-xy=7,2xy+y2=4,则代数式x2+xy+y2的值是___.
若|x+y-5|+(xy-6)2=0,则x2+y2的值为______.
如果x2+xy=2,xy+y2=-1,则x2-y2=______,x2+2xy+y2=______.
已知x+y=4,xy=2,则x2+y2+3xy=______.
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
设x,y≠0,且方程(x2+xy+y2)a=x2-xy+y2成立,则实数a的取值范围是______.
已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2=______.
若|2x+y-1|+(x-2y)2=0,则x2+xy+y2的值为______.
已知x2+y2=2,x+y=1,则10xy的值为______.
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?
若x2+xy-2y2=0,则x