已知:(x2+y2+1)2-4=0,则x2+y2=______.
已知:(x2+y2+1)2-4=0,则x2+y2=______.
已知x2+4x+y2-2y+5=0,则x2+y2=______.
已知实数x、y满足(x2+y2)(x2+y2-1)=2,则x2+y2的值为______.
已知x2+xy=5,xy+y2=-1,则x2-y2=______.
已知(x2+y2)(x2-1+y2)-12=0,求x2+y2的值.
已知(x2+y2+3)(x2+y2-2)-6=0,求x2+y2的值
(选做题)已知x+2y=1,则x2+y2的最小值是______.
如果x2+xy=2,xy+y2=-1,则x2-y2=______,x2+2xy+y2=______.
已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2=______.
因式分解:(x2+2x+1)-y2=______.
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,求x2+y2的值