考點(diǎn):指數(shù)函數(shù)的圖像與性質(zhì)
專題:函數(shù)的性質(zhì)及應(yīng)用
分析:根據(jù)當(dāng)?shù)讛?shù)大于1時(shí)指數(shù)函數(shù)(對數(shù)函數(shù))為增函數(shù),當(dāng)?shù)讛?shù)大于0小于1時(shí)指數(shù)函數(shù)(對數(shù)函數(shù))為減函數(shù),進(jìn)行判斷即可.
解答:
解:由當(dāng)?shù)讛?shù)大于1時(shí)指數(shù)函數(shù)(對數(shù)函數(shù))為增函數(shù),當(dāng)?shù)讛?shù)大于0小于1時(shí)指數(shù)函數(shù)(對數(shù)函數(shù))為減函數(shù),
∴3
3>3
0,
()-2>()1,log
0.70.4>log
0.70.6,ln1.6<ln1.4,
據(jù)此可以判斷,A,B,D錯(cuò)誤,C正確,
故選:C
點(diǎn)評:本題考查指數(shù)函數(shù)和對數(shù)函數(shù)的單調(diào)性的應(yīng)用,利用單調(diào)性得出兩數(shù)大。