(浙江专用)2020版高考数学大一轮复习课时82.6对数与对数函数教师备用题库.docx

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12.6 对数与对数函数教师专用真题精编1.(2018 课标全国,12,5 分)设 a=log0.20.3,b=log20.3,则( )A.a+blog0.21=0,b=log20.3ab,a+bababbc B.bacC.cba D.cab答案 D 本题主要考查对数的大小比较.由已知得 c=log23,log 23log2e1,b=ln2ab,故选 D.

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