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對f(x)求導:f'(x)= 1/x,∵x∈[2,5],∴1/x∈[1/5,1/2],即經過f(x)上的點的斜率的範圍是:[1/5,1/2],但由於P、Q是不同兩點,∴K(PQ)>1/5,且K(PQ)
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