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設切點座標為(a,f(a)),所以切線方程為y-f(a)=y'(a)(x-a),令y=0,所以x=2a,所以-f(a)=ay'(a),所以f(a)=C/a,所以y=C/x,經過(2,3),所以C=6,所以y=6/x
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