已知x2+4x+y2-2y+5=0,则x2+y2=______.
已知x2+4x+y2-2y+5=0,则x2+y2=______.
已知:(x2+y2+1)2-4=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x2-4y2=20,x+2y=5,则x=______,y=______.
已知x-y=2,则x2-y2-4y=______.
已知方程x2 +y2+4x-2y-4=0,求x2 +y2的最大值
已知x+y=4,xy=2,则x2+y2+3xy=______.
已知实数x,y满足x2+y2-2x+4y=0,则x2+y2的最小值是
已知x2+y2+z2-2x+4y-6z+14=0,则x+y+z=______.
已知实数x,y满足2x-y-5=0,则x2+y2的最小值为______.
已知x2+y2+4x-6y+13=0 求x2-2x\x2+3y2
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______.