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第一PPT > PPT課件 > 數(shù)學(xué)課件 > 人教高中數(shù)學(xué)B版必修二 > 《對(duì)數(shù)與對(duì)數(shù)函數(shù)》指數(shù)函數(shù)、對(duì)數(shù)函數(shù)與冪函數(shù)PPT課件(對(duì)數(shù)函數(shù)的性質(zhì)與圖像)

《對(duì)數(shù)與對(duì)數(shù)函數(shù)》指數(shù)函數(shù)、對(duì)數(shù)函數(shù)與冪函數(shù)PPT課件(對(duì)數(shù)函數(shù)的性質(zhì)與圖像)

《對(duì)數(shù)與對(duì)數(shù)函數(shù)》指數(shù)函數(shù)、對(duì)數(shù)函數(shù)與冪函數(shù)PPT課件(對(duì)數(shù)函數(shù)的性質(zhì)與圖像) 詳細(xì)介紹:

《對(duì)數(shù)與對(duì)數(shù)函數(shù)》指數(shù)函數(shù)、對(duì)數(shù)函數(shù)與冪函數(shù)PPT課件(對(duì)數(shù)函數(shù)的性質(zhì)與圖像)《對(duì)數(shù)與對(duì)數(shù)函數(shù)》指數(shù)函數(shù)、對(duì)數(shù)函數(shù)與冪函數(shù)PPT課件(對(duì)數(shù)函數(shù)的性質(zhì)與圖像)《對(duì)數(shù)與對(duì)數(shù)函數(shù)》指數(shù)函數(shù)、對(duì)數(shù)函數(shù)與冪函數(shù)PPT課件(對(duì)數(shù)函數(shù)的性質(zhì)與圖像)《對(duì)數(shù)與對(duì)數(shù)函數(shù)》指數(shù)函數(shù)、對(duì)數(shù)函數(shù)與冪函數(shù)PPT課件(對(duì)數(shù)函數(shù)的性質(zhì)與圖像)

《對(duì)數(shù)與對(duì)數(shù)函數(shù)》指數(shù)函數(shù)、對(duì)數(shù)函數(shù)與冪函數(shù)PPT課件(對(duì)數(shù)函數(shù)的性質(zhì)與圖像)

第一部分內(nèi)容:學(xué)習(xí)目標(biāo)

理解對(duì)數(shù)函數(shù)的概念,會(huì)判斷對(duì)數(shù)函數(shù)

初步掌握對(duì)數(shù)函數(shù)的圖像與性質(zhì)

能利用對(duì)數(shù)函數(shù)的性質(zhì)解決與之有關(guān)的問(wèn)題

... ... ...

對(duì)數(shù)與對(duì)數(shù)函數(shù)PPT,第二部分內(nèi)容:自主學(xué)習(xí)

問(wèn)題導(dǎo)學(xué)

預(yù)習(xí)教材P24-P27的內(nèi)容,思考以下問(wèn)題:

1.對(duì)數(shù)函數(shù)的概念是什么?它的解析式具有什么特點(diǎn)?

2.對(duì)數(shù)函數(shù)的圖像是什么,通過(guò)圖像可觀察到對(duì)數(shù)函數(shù)具有哪些性質(zhì)?

... ... ...

對(duì)數(shù)與對(duì)數(shù)函數(shù)PPT,第三部分內(nèi)容:新知初探

對(duì)數(shù)函數(shù)

一般地,函數(shù)____________稱為對(duì)數(shù)函數(shù),其中a是常數(shù),a>0且a≠1.

對(duì)數(shù)函數(shù)y=logax的性質(zhì):

(1)定義域是____________,因此函數(shù)圖像一定在y軸的______.

(2)值域是實(shí)數(shù)集______.

(3)函數(shù)圖像一定過(guò)點(diǎn)___________.

(4)當(dāng)a>1時(shí),y=logax是_________;當(dāng)0<a<1時(shí),y=logax是_________.

(5)對(duì)數(shù)函數(shù)的圖像

名師點(diǎn)撥

底數(shù)a與1的大小關(guān)系決定了對(duì)數(shù)函數(shù)圖像的“升降”:當(dāng)a>1時(shí),對(duì)數(shù)函數(shù)的圖像“上升”;當(dāng)0<a<1時(shí),對(duì)數(shù)函數(shù)的圖像“下降”.

... ... ...

對(duì)數(shù)與對(duì)數(shù)函數(shù)PPT,第四部分內(nèi)容:自我檢測(cè)

1.判斷正誤(正確的打“√”,錯(cuò)誤的打“×”)

(1)函數(shù)y=logx12是對(duì)數(shù)函數(shù).(  )

(2)函數(shù)y=2log3x是對(duì)數(shù)函數(shù).(  )

(3)函數(shù)y=log3(x+1)的定義域是(0,+∞).(  )

2.  函數(shù)f(x)=x-1+lg x的定義域是(  )

A.(0,+∞)  B.(0,1)

C.[1,+∞)  D.(1,+∞)

3.  下列不等號(hào)連接錯(cuò)誤的一組是(  )

A.log0.52.2>log0.52.3  B.log34>log65

C.log34>log56   D.logπe>logeπ

4.  函數(shù)y=log(3a-1)x是(0,+∞)上的減函數(shù),則實(shí)數(shù)a的取值范圍是________. 

... ... ...

對(duì)數(shù)與對(duì)數(shù)函數(shù)PPT,第五部分內(nèi)容:講練互動(dòng)

對(duì)數(shù)函數(shù)的概念

例1 判斷下列函數(shù)哪些是對(duì)數(shù)函數(shù)?

(1)y=3log2x;(2)y=log6x;(3)y=logx3;(4)y=log2x+1.

【解】(1)log2x的系數(shù)是3,不是1,不是對(duì)數(shù)函數(shù).

(2)符合對(duì)數(shù)函數(shù)的結(jié)構(gòu)形式,是對(duì)數(shù)函數(shù).

(3)自變量在底數(shù)位置上,不是對(duì)數(shù)函數(shù).

(4)對(duì)數(shù)式log2x后又加1,不是對(duì)數(shù)函數(shù).

規(guī)律方法

判斷一個(gè)函數(shù)是對(duì)數(shù)函數(shù)必須是形如y=logax(a>0且a≠1)的形式,即必須滿足以下條件:

(1)系數(shù)為1.

(2)底數(shù)為大于0且不等于1的常數(shù).

(3)對(duì)數(shù)的真數(shù)僅有自變量x.  

... ... ...

對(duì)數(shù)與對(duì)數(shù)函數(shù)PPT,第六部分內(nèi)容:達(dá)標(biāo)反饋

1.下列函數(shù)是對(duì)數(shù)函數(shù)的是(  )

A.y=loga(2x)   B.y=log22x

C.y=log2x+1   D.y=lg x

2.函數(shù)f(x)=11-x+lg(3x+1)的定義域是(  )

A.-13,+∞   B.-∞,-13

C.-13,13   D.-13,1

3.函數(shù)y=ax與y=-logax(a>0,且a≠1)在同一坐標(biāo)系中的圖像形狀可能是(  )

4.若a>0且a≠1,則函數(shù)y=loga(x-1)+1的圖像過(guò)定點(diǎn)為________.

5.比較下列各組數(shù)的大。

(1)log22________log23;

(2)log32________1;

(3)log134________0.

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