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你好! 記住一個結論:過圓(x-a)²;+(y-b)²;= r²;上一點(m,n)的圓的切線方程是(m-a)(x-a)+(n-b)(x-b)= r²; 所以本題答案:-3x+4y=25即3x - 4y = 25 = 0
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