若(x2+y2)(x2+y2+6)=7,则x2+y2的值是______.
已知(x2+y2)(x2+y2-6)+9=0,求x2+y2的值.
已知实数x、y满足(x2+y2)(x2+y2-1)=2,则x2+y2的值为______.
已知:(x2+y2+1)2-4=0,则x2+y2=______.
已知(x2+y2)(x2-1+y2)-12=0,求x2+y2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______.
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
已知(x2+y2+3)(x2+y2-2)-6=0,求x2+y2的值
已知x,y为实数,且(x2 +y2)(x2 +y2+2)=3.求x2 +y2的值
已知实数x.y满足(x2+y2)(x2+y2-1)=2,求x2+y2的值
已知x2-xy=7,2xy+y2=4,则代数式x2+xy+y2的值是___.
若实数x,y满足x2+4y2=4x,则S=x2+y2的取值范围是______.
若实数x,y满足2x2+3y2=1,S=3x2-2y2,则S的取值范围是______.