必修1對(duì)數(shù)及其運(yùn)算、對(duì)數(shù)函數(shù)分類復(fù)習(xí)

1、1對(duì)數(shù)及其運(yùn)算對(duì)數(shù)及其運(yùn)算考點(diǎn)考點(diǎn)1：指數(shù)式與對(duì)數(shù)式的互化：指數(shù)式與對(duì)數(shù)式的互化【例1】將下列指數(shù)式化為對(duì)數(shù)式，對(duì)數(shù)式化為指數(shù)式①；②；③；45625?61264??15.733m???????④；⑤；⑥12log164??lg0.012??ln102.303?【例2】求下列各式中的值x①；②；③；④；642log3x??log86x?8log16x?33log27x?⑤；⑥；⑦393log27x???56loglog0x???21lo

2、g322x???考點(diǎn)考點(diǎn)2：對(duì)數(shù)恒等式及對(duì)數(shù)性質(zhì)：對(duì)數(shù)恒等式及對(duì)數(shù)性質(zhì)【例3】（1）下列等式中正確的是（）ABCD3log5325?4log333?3log133?3log201232012?（2）求下列各值：①②③④lg1?3log3?3log53?7log57?⑤⑥；⑦⑧3log59?3log33?9log53?2log312???????⑨.2log518???????（3）已知，求實(shí)數(shù)的值2(3)log(3)1xxx???x3（

3、14）（15）??2lg25lg2lg50lg2????281lg500lglg6450lg2lg552????（16）（17）（18）58log4log5?235log25log8log9??lg3lg30155???????（19）若，則_______（用表示）；32a?332log6log8??a（20）已知，，則_______.18log9a?185b?36log45?課后練習(xí)課后練習(xí)1、已知，那么等于（）201232log[l

4、og(log)]0x?12x?ABCD131231221332、已知，則等于（）5()lnfxx?(2)fABCDln2ln321ln321ln253、已知，則2349a?(0)a?23loga?4、（1）已知，則用表示，表達(dá)式為6log3a?a6log26log2?（2）已知且，則等于（）??001abmabm????logmbx?logmaABCD1x?1x?1x1x?5、（1）________2log30lg4lg2520.5??