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圓的標準方程為:(x-2)²;+y²;=16圓心是(2,0),半徑r=4,畫出草圖可知:圓與x軸負半軸的交點為A(-2,0),與y軸負半軸的交點為B(0,-2√3)圓在第三象限的部分就是夾在A,B這兩點之間的弧.直線y=k(x-1)+1過定點M(1,1)…
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