圆C1:x²+y²-2x-6y-1=0,圆C2:x²+y²-10x-12y+m=0.求m为何值时,圆C1与圆C2外切?

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圆C1:x²+y²-2x-6y-1=0,圆C2:x²+y²-10x-12y+m=0.求m为何值时,圆C1与圆C2外切?
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圆C1:x²+y²-2x-6y-1=0,圆C2:x²+y²-10x-12y+m=0.求m为何值时,圆C1与圆C2外切?
圆C1:x²+y²-2x-6y-1=0,圆C2:x²+y²-10x-12y+m=0.求m为何值时,圆C1与圆C2外切?

圆C1:x²+y²-2x-6y-1=0,圆C2:x²+y²-10x-12y+m=0.求m为何值时,圆C1与圆C2外切?
化简(x-1)²+(y-3)²=11 ,(x-5)²+(y-6)²=61-m
C1(1,3)C2(5,6)
C1C2=5
∵圆C1与圆C2外切
r1=√11,r2=√(61-m)
C1C2=r1+r2=5
m=25+10√11