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本題由於點M(3,4)在圓上,所以過M的切線只有一條可直接用結論M(x0,y0)在圓X²;+Y²;=r²;上則過M的切線方程就是x0X+y0Y=r²;答案是3x+4y=25即3x+4y-25=0也可用下列方法計算得到:由於x=3與圓不相切,所以…
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