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1、對(duì)數(shù)基本性質(zhì)：a^(log(a)(b))=b；log(a)(a^b)=b；log(a)(MN)=log(a)(M)+log(a)(N)；log(a)(M÷N)=log(a)(M)-log(a)(N)；log(a)(M^n)=nlog(a)(M)；log(a^n)M=1/nlog(a)(M)。

2、其他性質(zhì)：換底公式：log(a)(N)=log(b)(N)÷log(b)(a)；log(a)(b)=1/log(b)(a)；對(duì)數(shù)函數(shù)的圖象都過(guò)(1,0)點(diǎn)。