若x2-4x+y2+6y+13=0,则x=______,y=______.
若x2-4x+y2+6y+13=0,则x=______,y=______.
已知x2+4x+y2-2y+5=0,则x2+y2=______.
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
已知x2+y2+z2-2x+4y-6z+14=0,则x+y+z=______.
已知x2-4y2=20,x+2y=5,则x=______,y=______.
已知x-y=2,则x2-y2-4y=______.
若x+y=5,xy=6,则x2+y2=______.
若x2+y2=12,xy=4,则x-y=______.
已知x2-y2=12,x+y=6,则x-y=______,x=______,y=______.
已知实数x、y满足x2+4xy+4y2+x+2y-6=0,则x+2y的值为______.
若实数x,y满足x2+y2-2x+4y=0,则x-2y的最大值为______.
若实数x、y满足x2+y2-2x+4y=0,则x-3y的最大值是______.