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真數大於1,對數大於0,則底數大於1,即a>1,b>1 根據換底公式,得 0<lg2/lga<lg2/lgb lg是大於的,每項都除以lg2,得 0<1/lga<1/lgb ∴1/lga<1/lgb ∴lga>lgb>0 ∴a>b
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