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試卷第=page11頁,共=sectionpages33頁第4函數(shù)及其性質(zhì)學(xué)校____________姓名____________班級(jí)____________一、單選題1.已知函數(shù)SKIPIF1<0若SKIPIF1<0,則m的值為(

)A.SKIPIF1<0 B.2 C.9 D.2或9【答案】C【詳解】∵函數(shù)SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0或SKIPIF1<0,解得SKIPIF1<0.故選:C.2.已知函數(shù)SKIPIF1<0,關(guān)于函數(shù)SKIPIF1<0的結(jié)論正確的是(

)A.SKIPIF1<0 B.SKIPIF1<0的值域?yàn)镾KIPIF1<0C.SKIPIF1<0的解集為SKIPIF1<0 D.若SKIPIF1<0,則x的值是1或SKIPIF1<0【答案】B【詳解】解:因?yàn)镾KIPIF1<0,函數(shù)圖象如下所示:由圖可知SKIPIF1<0,故A錯(cuò)誤;SKIPIF1<0的值域?yàn)镾KIPIF1<0,故B正確;由SKIPIF1<0解得SKIPIF1<0,故C錯(cuò)誤;SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,故D錯(cuò)誤;故選:B3.定義在SKIPIF1<0上的函數(shù)SKIPIF1<0滿足SKIPIF1<0.若SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱,則下列選項(xiàng)中一定成立的是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】函數(shù)SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱,則必有SKIPIF1<0,所以,SKIPIF1<0,SKIPIF1<0,又因?yàn)镾KIPIF1<0滿足SKIPIF1<0,取SKIPIF1<0,所以,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,取SKIPIF1<0,則SKIPIF1<0,A對;故選:A4.若冪函數(shù)SKIPIF1<0滿足SKIPIF1<0,則下列關(guān)于函數(shù)SKIPIF1<0的判斷正確的是(

)A.SKIPIF1<0是周期函數(shù) B.SKIPIF1<0是單調(diào)函數(shù)C.SKIPIF1<0關(guān)于點(diǎn)SKIPIF1<0對稱 D.SKIPIF1<0關(guān)于原點(diǎn)對稱【答案】C【詳解】由題意得SKIPIF1<0,即SKIPIF1<0,故SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0單調(diào)遞減;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0單調(diào)遞增;所以SKIPIF1<0,因此方程SKIPIF1<0有唯一解,解為SKIPIF1<0,因此SKIPIF1<0,所以不是周期函數(shù),不是單調(diào)函數(shù),關(guān)于點(diǎn)SKIPIF1<0對稱,故選:C.5.已知SKIPIF1<0是奇函數(shù),若SKIPIF1<0恒成立,則實(shí)數(shù)SKIPIF1<0的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】SKIPIF1<0是奇函數(shù),SKIPIF1<0恒成立,即SKIPIF1<0恒成立,化簡得,SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,解得SKIPIF1<0,又SKIPIF1<0且SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,由復(fù)合函數(shù)的單調(diào)性判斷得,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,又SKIPIF1<0為奇函數(shù),所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞減;由SKIPIF1<0恒成立得,SKIPIF1<0恒成立,則SKIPIF1<0恒成立,所以SKIPIF1<0恒成立,解得SKIPIF1<0.故選:B.6.已知函數(shù)SKIPIF1<0是定義在R上的偶函數(shù),且SKIPIF1<0在SKIPIF1<0單調(diào)遞減,SKIPIF1<0,則SKIPIF1<0的解集為(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】因?yàn)楹瘮?shù)SKIPIF1<0是定義在R上的偶函數(shù),所以SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對稱.因?yàn)镾KIPIF1<0在SKIPIF1<0上單調(diào)遞減,所以在SKIPIF1<0上單調(diào)遞增.因?yàn)镾KIPIF1<0,所以SKIPIF1<0.所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.由SKIPIF1<0,得SKIPIF1<0或SKIPIF1<0解得SKIPIF1<0.故選:C7.函數(shù)SKIPIF1<0,若SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0的范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【詳解】依題意SKIPIF1<0,SKIPIF1<0且SKIPIF1<0,故SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上遞增,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0的范圍是SKIPIF1<0.故選:A.8.已知函數(shù)SKIPIF1<0,則不等式SKIPIF1<0的解集為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【詳解】函數(shù)SKIPIF1<0,則SKIPIF1<0,因SKIPIF1<0,則不等式SKIPIF1<0成立必有SKIPIF1<0,即SKIPIF1<0,令SKIPIF1<0,求導(dǎo)得SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,因此,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,在SKIPIF1<0上單調(diào)遞增,又SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,于是得SKIPIF1<0,即SKIPIF1<0,令SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,SKIPIF1<0,SKIPIF1<0,因此,SKIPIF1<0無解,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,于是得SKIPIF1<0,即SKIPIF1<0,此時(shí)SKIPIF1<0,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,SKIPIF1<0,SKIPIF1<0,不等式SKIPIF1<0解集為SKIPIF1<0,所以不等式SKIPIF1<0的解集為SKIPIF1<0.故選:B二、多選題9.已知SKIPIF1<0是SKIPIF1<0上的奇函數(shù),SKIPIF1<0是SKIPIF1<0上的偶函數(shù),且當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則下列說法正確的是(

)A.SKIPIF1<0最小正周期為4 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】BCD【詳解】因?yàn)镾KIPIF1<0是偶函數(shù),所以SKIPIF1<0,又因?yàn)镾KIPIF1<0是奇函數(shù),所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0的周期為SKIPIF1<0,故A錯(cuò)誤;又當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0,選項(xiàng)B正確;SKIPIF1<0,選項(xiàng)C正確;SKIPIF1<0,選項(xiàng)D正確.故選:BCD.10.已知函數(shù)SKIPIF1<0對任意SKIPIF1<0都有SKIPIF1<0,若函數(shù)SKIPIF1<0的圖象關(guān)于SKIPIF1<0對稱,且對任意的SKIPIF1<0,且SKIPIF1<0,都有SKIPIF1<0,若SKIPIF1<0,則下列結(jié)論正確的是(

)A.SKIPIF1<0是偶函數(shù) B.SKIPIF1<0C.SKIPIF1<0的圖象關(guān)于點(diǎn)SKIPIF1<0對稱 D.SKIPIF1<0【答案】ABCD【詳解】對于選項(xiàng)A:由函數(shù)SKIPIF1<0的圖像關(guān)于SKIPIF1<0對稱,根據(jù)函數(shù)的圖象變換,可得函數(shù)SKIPIF1<0的圖象關(guān)于SKIPIF1<0對稱,所以函數(shù)SKIPIF1<0為偶函數(shù),所以A正確;對于選項(xiàng)B:由函數(shù)SKIPIF1<0對任意SKIPIF1<0都有SKIPIF1<0,可得SKIPIF1<0,所以函數(shù)SKIPIF1<0是周期為4的周期函數(shù),因?yàn)镾KIPIF1<0,可得SKIPIF1<0,則SKIPIF1<0,所以B正確;又因?yàn)楹瘮?shù)SKIPIF1<0為偶函數(shù),即SKIPIF1<0,所以SKIPIF1<0,可得SKIPIF1<0,所以函數(shù)SKIPIF1<0關(guān)于SKIPIF1<0中心對稱,所以C正確;由對任意的SKIPIF1<0,且SKIPIF1<0,都有SKIPIF1<0,可得函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上為單調(diào)遞增函數(shù),又因?yàn)楹瘮?shù)為偶函數(shù),故函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上為單調(diào)遞減函數(shù),故SKIPIF1<0,所以D正確.故選:ABCD11.已知冪函數(shù)SKIPIF1<0的圖象經(jīng)過點(diǎn)SKIPIF1<0,則下列命題正確的有(

).A.函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0B.函數(shù)SKIPIF1<0為非奇非偶函數(shù)C.過點(diǎn)SKIPIF1<0且與SKIPIF1<0圖象相切的直線方程為SKIPIF1<0D.若SKIPIF1<0,則SKIPIF1<0【答案】BC【詳解】設(shè)SKIPIF1<0,將點(diǎn)SKIPIF1<0代入SKIPIF1<0,得SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,對于A:SKIPIF1<0的定義域?yàn)镾KIPIF1<0,即選項(xiàng)A錯(cuò)誤;對于B:因?yàn)镾KIPIF1<0的定義域?yàn)镾KIPIF1<0,所以SKIPIF1<0不具有奇偶性,即選項(xiàng)B正確;對于C:因?yàn)镾KIPIF1<0,所以SKIPIF1<0,設(shè)切點(diǎn)坐標(biāo)為SKIPIF1<0,則切線斜率為SKIPIF1<0,切線方程為SKIPIF1<0,又因?yàn)榍芯€過點(diǎn)SKIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0,即切線方程為SKIPIF1<0,即SKIPIF1<0,即選項(xiàng)C正確;對于D:當(dāng)SKIPIF1<0時(shí),SKIPIF1<0SKIPIF1<0,即SKIPIF1<0成立,即選項(xiàng)D錯(cuò)誤.故選:BC.12.已知函數(shù)SKIPIF1<0,則(

)A.SKIPIF1<0的定義域?yàn)镽 B.SKIPIF1<0是奇函數(shù)C.SKIPIF1<0在SKIPIF1<0上單調(diào)遞減 D.SKIPIF1<0有兩個(gè)零點(diǎn)【答案】BC【詳解】對SKIPIF1<0:SKIPIF1<0的定義域?yàn)镾KIPIF1<0,SKIPIF1<0錯(cuò)誤;對SKIPIF1<0:SKIPIF1<0,且定義域關(guān)于原點(diǎn)對稱,故SKIPIF1<0是奇函數(shù),SKIPIF1<0正確;對SKIPIF1<0:當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,單調(diào)遞減,SKIPIF1<0正確;對SKIPIF1<0:因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0無解,即SKIPIF1<0沒有零點(diǎn),SKIPIF1<0錯(cuò)誤.故選:SKIPIF1<0.三、填空題13.已知函數(shù)SKIPIF1<0為奇函數(shù),則SKIPIF1<0______.【答案】2或SKIPIF1<0【詳解】函數(shù)SKIPIF1<0為奇函數(shù),其定義域?yàn)镾KIPIF1<0由SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0,滿足條件.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0,滿足條件.故答案為:2或SKIPIF1<014.已知SKIPIF1<0是定義在R上的偶函數(shù),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.若SKIPIF1<0的圖象與x軸恰有三個(gè)交點(diǎn),則實(shí)數(shù)a的值為___________.【答案】2【詳解】由偶函數(shù)的對稱性知:SKIPIF1<0在SKIPIF1<0、SKIPIF1<0上各有一個(gè)零點(diǎn)且SKIPIF1<0,所以SKIPIF1<0,則SKIPIF1<0或SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),在SKIPIF1<0上SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上遞增,SKIPIF1<0,故無零點(diǎn),不合要求;當(dāng)SKIPIF1<0時(shí),在SKIPIF1<0上SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上遞減,在SKIPIF1<0上遞增,則SKIPIF1<0且SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0上有一個(gè)零點(diǎn),符合要求;綜上,SKIPIF1<0.故答案為:215.寫出一個(gè)同時(shí)具有下列性質(zhì)①②③的函數(shù)SKIPIF1<0___________.①SKIPIF1<0是定義域?yàn)镾KIPIF1<0的奇函數(shù);②SKIPIF1<0;③SKIPIF1<0.【答案】SKIPIF1<0(答案不唯一)【詳解】由條件①②③可知函數(shù)對稱軸為SKIPIF1<0,定義域?yàn)镽的奇函數(shù),可寫出滿足條件的函數(shù)SKIPIF1<0.故答案為:SKIPIF1<0(答案不唯一)16.已知函數(shù)SKIPIF1<0是R上的奇函數(shù),對任意SKIPIF1<0,都有SKIPIF1<0成立,當(dāng)SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0時(shí),都有SKIPIF1<0,有下列命題:①SKIPIF1<0;②點(diǎn)SKIPIF1<0是函數(shù)SKIPIF1<0圖象的一個(gè)對稱中心;③函數(shù)SKIPIF1<

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