若x2+y2-6y+4x+13=0,则x2-y2=______.
已知x2+4x+y2-2y+5=0,则x2+y2=______.
若x2-4x+y2+6y+13=0,则x=______,y=______.
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
1.已知X2+Y2-4X-6Y+13=0,求Y2-X2的值
已知x2-4x+y2-6y+13=0求x2+y2的值?
已知x2+y2+4x-6y+13=0 求x2-2x\x2+3y2
已知x2+y2-4x+6y+13=0,求x2-6xy+9y2的值.
已知x2+y2+4x-6y+13=0
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
若x+y=5,xy=6,则x2+y2=______.
若x2+y2=12,xy=4,则x-y=______.
若实数x,y满足x2+4y2=4x,则S=x2+y2的取值范围是______.