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26對(duì)數(shù)與對(duì)數(shù)函數(shù)教師講義-免費(fèi)閱讀

  

【正文】 2lg y答案 D解析 2lg x浙江)已知x,y為正實(shí)數(shù),則 (  )A.2lg x+lg y=2lg x+2lg yB.2lg(x+y)=2lg xf(logπ3),c=(log39) 湖州名思教育一對(duì)一個(gè)性化輔導(dǎo)名思教育輔導(dǎo)講義學(xué)員姓名 輔導(dǎo)科目數(shù)學(xué)年 級(jí)高一授課教師課 題對(duì)數(shù)與對(duì)數(shù)函數(shù)授課時(shí)間教學(xué)目標(biāo)重點(diǎn)、難點(diǎn)考點(diǎn)及考試要求教學(xué)內(nèi)容1. 對(duì)數(shù)的概念一般地,對(duì)于指數(shù)式ab=N,我們把“以a為底N的對(duì)數(shù)b”記作logaN,即b=logaN(a0,且a≠1).其中,數(shù)a叫做對(duì)數(shù)的底數(shù),N叫做真數(shù),讀作“b等于以a為底N的對(duì)數(shù)”.2. 對(duì)數(shù)logaN(a0,且a≠1)具有下列性質(zhì)(1)N0;(2)loga1=0;(3)logaa=1.3. 對(duì)數(shù)的運(yùn)算法則(1)loga(MN)=logaM+logaN;(2)loga=logaM-logaN;(3)logaMα=αlogaM (α∈R).4.兩個(gè)重要公式(1)對(duì)數(shù)恒等式:=__N__(2)換底公式:logbN=.5.對(duì)數(shù)函數(shù)的圖象與性質(zhì)a10a1圖象性質(zhì)(1)定義域:(0,+∞)(2)值域:R(3)過定點(diǎn)(1,0),即x=1時(shí),y=0(4)當(dāng)x1時(shí),y0;當(dāng)0x1時(shí),y0(5)當(dāng)x1時(shí),y0;當(dāng)0x1時(shí),y0(6)在(0,+∞)上是增函數(shù)(7)在(0,+∞)上是減函數(shù)6. 反函數(shù)指數(shù)函數(shù)y=ax與對(duì)數(shù)函數(shù)y=logax互為反函數(shù),它們的圖象關(guān)于直線y=x對(duì)稱.1. 判斷下面結(jié)論是否正確(請(qǐng)?jiān)诶ㄌ?hào)中打“√”或“”)(1)若log2(log3x)=log3(log2y)=0,則x+y=5. ( √ )(2)2log510+=5. (  )(3)已知函數(shù)f(x)=lg x,若f(ab)=1,則f(a2)+f(b2)=2. ( √ )(4)log2x2=2log2x. (  )(5)當(dāng)x1時(shí),logax0. (  )(6)當(dāng)x1時(shí),若logaxlogbx,則ab. (  )2. (2013f(),b=
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