曲线y=x2 -6x+1与y轴的交点: D(0, 1)y = x2 -6x+1 = 0, x = 3±2√2, 与x轴的交点: A(3-2√2, 0), B(3+2√2, 0)曲线y=x2 -6x+1为抛物线,对称轴为x = 3显然圆心C在对称轴上,设C(3, b)CA = CD = rCA2 = CD2(3 - 3 + 2√2)2 + (b - 0)2 = (3- 0)2 + (b - 1)28 + b2 = 9 + b2 - 2b + 1b = 1C(3, 1)C, D的纵坐标相同,距离为横坐标之差,...
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