x^2+y^2-2x-6y+6=0
(x-1)^2+(y-3)^3=2^2
x^2+y^2-6x-10y+30=0
(x-3)^2+(y-5)^2=2^2
交点A(1,5) B(3,3)
直线方程:(x-1)/(y-5)=(3-1)/(3-5)=-1
x+Y+4=0