對(duì)數(shù)函數(shù)及其性質(zhì)教案1

1、222（3）對(duì)數(shù)函數(shù)及其性質(zhì)（教學(xué)設(shè)計(jì)））對(duì)數(shù)函數(shù)及其性質(zhì)（教學(xué)設(shè)計(jì)）（內(nèi)容：指數(shù)函數(shù)與對(duì)數(shù)函數(shù)的關(guān)系）（內(nèi)容：指數(shù)函數(shù)與對(duì)數(shù)函數(shù)的關(guān)系）教學(xué)目的：教學(xué)目的：⒈了解底數(shù)相同的指數(shù)函數(shù)與對(duì)數(shù)函數(shù)互為反函數(shù)；⒉通過對(duì)互為反函數(shù)的指數(shù)函數(shù)和對(duì)數(shù)函數(shù)圖象間的關(guān)系的認(rèn)識(shí)，了解互為反函數(shù)的兩個(gè)函數(shù)圖象間的關(guān)系；⒊通過指數(shù)函數(shù)與對(duì)數(shù)函數(shù)的比較，了解互為反函數(shù)的兩個(gè)函數(shù)定義域和值域之間的關(guān)系教學(xué)重點(diǎn)教學(xué)重點(diǎn)：底數(shù)相同的指數(shù)函數(shù)與對(duì)數(shù)函數(shù)互為反函數(shù)教學(xué)難

2、點(diǎn)教學(xué)難點(diǎn)：互為反函數(shù)的兩個(gè)函數(shù)圖象間的關(guān)系教學(xué)過程教學(xué)過程：一、復(fù)習(xí)回顧，新課引入：1、指數(shù)函數(shù)與對(duì)數(shù)函數(shù)對(duì)照表、指數(shù)函數(shù)與對(duì)數(shù)函數(shù)對(duì)照表指數(shù)函數(shù)指數(shù)函數(shù)對(duì)數(shù)函數(shù)對(duì)數(shù)函數(shù)一般形式，且xya?(0a?1)a?，且logayx?(0a?1)a?圖象定義域()????(0)??值域(0)??()????變式訓(xùn)練1：在同一坐標(biāo)系中，作出函數(shù)與的圖象，1()2xy?12logyx?并觀察兩圖象之間有何關(guān)系。2、反函數(shù)：?jiǎn)?：在指數(shù)函數(shù)中，x為自