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設切線方程為y=kx+b把點A代入15=5k+b b=15-5ky=kx+15-5kx²;+y²;=25圓心為(0,0)半徑=5圓心到直線的距離=半徑即|15-5k|/根號下(k²;+1)=5(15-5k)²;=25(k²;+1)225-150k+25k²;=25k²;+25k =…
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