S507E 以一般式表示圓的方程
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x²+y²-16x-12y-45=0
(x-8)²+(y-6)²=145
x²+y²+2x+6y-15=0
(x+1)²+(y+3)²=5
x²+y²+6x-14y+6=0
(x+3)²+(y-7)²=52
x²+y²-4x+10y+11=0
(x-2)²+(y+5)²=18
x²+y²-8x-6y+5=0
(x-4)²+(y-3)²=20
