對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)課件

對(duì)數(shù)與對(duì)數(shù)運(yùn)算（二）星期四，快到成功的彼岸了，加油！對(duì)數(shù)與對(duì)數(shù)運(yùn)算（二）星期四，快到成功的彼岸了，加油！溫故而知新一、什么是對(duì)數(shù)？溫故而知新一、什么是對(duì)數(shù)？新知初探思維啟動(dòng)1．對(duì)數(shù)(1)對(duì)數(shù)的概念①定義：如果ax＝N(a>0，且a≠1)，那么數(shù)____叫做以____為底____的對(duì)數(shù)，記作___________.xaNx＝logaN新知初探思維啟動(dòng)1．對(duì)數(shù)xaNx＝logaN對(duì)數(shù)運(yùn)算對(duì)數(shù)運(yùn)算1閱讀課本P64-66，完成優(yōu)化P44對(duì)數(shù)的運(yùn)算公式自主學(xué)習(xí)提示：1閱讀課本P64-66，完成優(yōu)化P44自主學(xué)習(xí)提示：logaNlogaM－logaNnlogaM(n∈R)logaNlogaM－logaNnlogaM(n∈R)想一想2.若M，N同號(hào)，則式子loga(M·N)＝logaM＋logaN(a>0，且a≠1)成立嗎？提示：不一定成立．做一做3.log318－log32的值為(

)A．log316

B．log320C．log336

D．2答案：D想一想對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件1做優(yōu)化P46例3（1）例4（2）自主學(xué)習(xí)提示：1做優(yōu)化P46例3（1）例4（2）自主學(xué)習(xí)例3例3對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件名師微博這是關(guān)鍵步．名師微博對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件變式訓(xùn)練變式訓(xùn)練對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件例4例4對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件【名師點(diǎn)評(píng)】換底公式的本質(zhì)是化同底，這是解決對(duì)數(shù)問(wèn)題的基本方法．解題過(guò)程中換成什么樣的底應(yīng)結(jié)合題目條件，并非一定用常用對(duì)數(shù)、自然對(duì)數(shù)．【名師點(diǎn)評(píng)】換底公式的本質(zhì)是化同底，這是解決對(duì)數(shù)問(wèn)題的基本變式訓(xùn)練變式訓(xùn)練對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件備選例題備選例題對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件方法感悟方法感悟?qū)?shù)與對(duì)數(shù)運(yùn)算(二)ppt課件對(duì)數(shù)與對(duì)數(shù)運(yùn)算(二)ppt課件知能演練輕松闖