教你三招化簡(jiǎn)對(duì)數(shù)式

在解答對(duì)數(shù)的求值問(wèn)題、最值問(wèn)題、單調(diào)性問(wèn)題、參數(shù)問(wèn)題時(shí)，要先對(duì)對(duì)數(shù)式進(jìn)行化簡(jiǎn)，那么化簡(jiǎn)對(duì)數(shù)式有哪些招數(shù)？