若|2x+y-1|+(x-2y)2=0,则x2+xy+y2的值为______.
若|2x+y-1|+(x-2y)2=0,则x2+xy+y2的值为______.
若|x+y-5|+(xy-6)2=0,则x2+y2的值为______.
已知实数x、y满足x2+4xy+4y2+x+2y-6=0,则x+2y的值为______.
已知x2+y2=2,x+y=1,则10xy的值为______.
若x2-2xy-y2-x+Y-1=0 求x-y的值
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______.
已知实数x、y满足(x2+y2)(x2+y2-1)=2,则x2+y2的值为______.
设x,y为实数,若4x2+y2+xy=1,则2x+y的最大值是( )
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
已知x-y+1,X2+Y2=25 求(x+y)2和x2-xy+y2的值
(x+y)(x+y+1)=0 求x2+y2+2xy的值