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設l為y=kx,圓C化成標準式:(x-5)²;+y²;=25 然後根據弦心距、弦長、半徑的關係,就可以求出k 弦心距就是圓心到弦的距離,可以根據點到線的距離來求:d=5k/√(k²;+1) 根據:d²;+4²;=25求出k=±3/4 ∴l:y=±3/4
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