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專題05函數(shù)的奇偶性、單調(diào)性、周期性一、單選題1.(2024屆廣東省高三上學(xué)期第一次調(diào)研)已知函數(shù)SKIPIF1<0的圖象關(guān)于點(diǎn)SKIPIF1<0對(duì)稱,則下列函數(shù)是奇函數(shù)的是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】由題意知:將SKIPIF1<0圖象向左平移SKIPIF1<0個(gè)單位長(zhǎng)度,再向下平移SKIPIF1<0個(gè)單位長(zhǎng)度,所得函數(shù)關(guān)于點(diǎn)SKIPIF1<0對(duì)稱,則所得函數(shù)為奇函數(shù),SKIPIF1<0為奇函數(shù).故選D.2.(2024屆湖北省宜荊荊恩高三9月起點(diǎn)聯(lián)考)定義在SKIPIF1<0上的減函數(shù)SKIPIF1<0滿足條件:對(duì)SKIPIF1<0,SKIPIF1<0,總有SKIPIF1<0,則不等式SKIPIF1<0的解集是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】在SKIPIF1<0中,令SKIPIF1<0,得SKIPIF1<0,所以有SKIPIF1<0,因?yàn)楹瘮?shù)SKIPIF1<0是定義在SKIPIF1<0上的減函數(shù),所以有SKIPIF1<0,故選D3.(2024屆新疆喀什地區(qū)澤普縣高三上學(xué)期第一次月考)已知SKIPIF1<0是定義在R上的奇函數(shù),SKIPIF1<0的圖象關(guān)于SKIPIF1<0對(duì)稱,SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.0 C.1 D.2【答案】A【解析】因?yàn)镾KIPIF1<0的圖象關(guān)于SKIPIF1<0對(duì)稱,所以SKIPIF1<0,于是SKIPIF1<0,又SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù),所以SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0的周期為4,所以SKIPIF1<0,又因?yàn)镾KIPIF1<0是定義在SKIPIF1<0上的奇函數(shù),所以SKIPIF1<0.故選SKIPIF1<0.4.(2023屆陜西省安康市石泉縣高三下學(xué)期2月月考)若SKIPIF1<0是奇函數(shù),則(
)A.SKIPIF1<0,SKIPIF1<0 B.SKIPIF1<0,SKIPIF1<0 C.SKIPIF1<0,SKIPIF1<0 D.SKIPIF1<0,SKIPIF1<0【答案】B【解析】SKIPIF1<0是奇函數(shù),則SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,解之得SKIPIF1<0,則SKIPIF1<0,經(jīng)檢驗(yàn)SKIPIF1<0是奇函數(shù).故選B5.(2023屆河南省部分學(xué)校高三押題信息卷)設(shè)SKIPIF1<0是定義在SKIPIF1<0上的周期為5的奇函數(shù),SKIPIF1<0,則SKIPIF1<0在SKIPIF1<0內(nèi)的零點(diǎn)個(gè)數(shù)最少是(
)A.4 B.6 C.7 D.9【答案】D【解析】因?yàn)镾KIPIF1<0是定義在SKIPIF1<0上的周期為5的奇函數(shù),所以SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0.所以SKIPIF1<0,故零點(diǎn)至少有SKIPIF1<0,則SKIPIF1<0在SKIPIF1<0內(nèi)的零點(diǎn)個(gè)數(shù)最少是9.故選D6.(2024屆陜西省漢中市高三上學(xué)期第一次校際聯(lián)考)已知定義在R上的奇函數(shù)SKIPIF1<0滿足SKIPIF1<0,則以下說(shuō)法錯(cuò)誤的是(
)A.SKIPIF1<0 B.SKIPIF1<0的一個(gè)周期為2C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】SKIPIF1<0是R上的奇函數(shù),因此SKIPIF1<0,A正確;SKIPIF1<0,所以2是它的一個(gè)周期,B正確;SKIPIF1<0,但SKIPIF1<0的值不確定,C錯(cuò);SKIPIF1<0,SKIPIF1<0,因此SKIPIF1<0,D正確.故選C.7.(2024屆四川省廣安高三上學(xué)期9月月考)已知函數(shù)SKIPIF1<0為SKIPIF1<0上的偶函數(shù),且對(duì)任意SKIPIF1<0,SKIPIF1<0且SKIPIF1<0,均有SKIPIF1<0成立,若SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0的大小關(guān)系為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】因?yàn)镾KIPIF1<0對(duì)任意SKIPIF1<0,SKIPIF1<0且SKIPIF1<0,均有SKIPIF1<0成立,故SKIPIF1<0在SKIPIF1<0上單調(diào)遞減.又SKIPIF1<0為SKIPIF1<0上的偶函數(shù),故SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,即SKIPIF1<0,故SKIPIF1<0,故SKIPIF1<0.故選A8.(2023屆安徽省臨泉第一中學(xué)高三上學(xué)期第三次月考)已知函數(shù)SKIPIF1<0的定義域?yàn)镽,且SKIPIF1<0,SKIPIF1<0是偶函數(shù),若SKIPIF1<0,SKIPIF1<0,則n的值為(
)A.2021 B.2022 C.2023 D.2024【答案】B【解析】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,所以函數(shù)SKIPIF1<0是周期為4的函數(shù),又SKIPIF1<0,所以由SKIPIF1<0得SKIPIF1<0,因?yàn)镾KIPIF1<0是偶函數(shù),所以SKIPIF1<0,所以SKIPIF1<0,由周期性可得SKIPIF1<0,又SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0.SKIPIF1<0SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0時(shí),SKIPIF1<0.故選B.9.(2024屆】河北省邯鄲市高三上學(xué)期第一次調(diào)研)設(shè)函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,SKIPIF1<0為奇函數(shù),SKIPIF1<0為偶函數(shù),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0為奇函數(shù) D.SKIPIF1<0【答案】D【解析】因?yàn)镾KIPIF1<0為奇函數(shù),所以SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0為偶函數(shù),所以SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,故A錯(cuò)誤;由當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,得SKIPIF1<0,則SKIPIF1<0,故B錯(cuò)誤;SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,故D正確;對(duì)于C,由SKIPIF1<0,得SKIPIF1<0,若SKIPIF1<0為奇函數(shù),則SKIPIF1<0也為奇函數(shù),令SKIPIF1<0,則SKIPIF1<0為奇函數(shù),則SKIPIF1<0,又SKIPIF1<0,矛盾,所以SKIPIF1<0不是奇函數(shù),即SKIPIF1<0不是奇函數(shù),故C錯(cuò)誤.故選D.10.(2024屆江蘇省南京市六校高三上學(xué)期8月聯(lián)考)已知函數(shù)SKIPIF1<0及其導(dǎo)函數(shù)SKIPIF1<0的定義域均為SKIPIF1<0,記SKIPIF1<0,若SKIPIF1<0,SKIPIF1<0均為偶函數(shù),則下列等式一定正確的是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】由函數(shù)SKIPIF1<0為偶函數(shù),可得SKIPIF1<0,則SKIPIF1<0,所以函數(shù)SKIPIF1<0關(guān)于SKIPIF1<0成軸對(duì)稱;由函數(shù)SKIPIF1<0為偶函數(shù),可得SKIPIF1<0,所以函數(shù)SKIPIF1<0關(guān)于SKIPIF1<0成軸對(duì)稱;對(duì)于A,設(shè)SKIPIF1<0,SKIPIF1<0,顯然符合題意,但SKIPIF1<0,故A錯(cuò)誤;對(duì)于B,假設(shè)SKIPIF1<0不關(guān)于SKIPIF1<0成中心對(duì)稱,SKIPIF1<0,求導(dǎo)可得SKIPIF1<0,即SKIPIF1<0,顯然與題設(shè)矛盾,所以SKIPIF1<0必定關(guān)于SKIPIF1<0成中心對(duì)稱,由SKIPIF1<0,且SKIPIF1<0為函數(shù)SKIPIF1<0圖象的對(duì)稱軸,則SKIPIF1<0,由SKIPIF1<0SKIPIF1<0,則函數(shù)SKIPIF1<0圖象的對(duì)稱軸為直線SKIPIF1<0,由SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,故B正確;對(duì)于C,設(shè)SKIPIF1<0,令SKIPIF1<0,解得SKIPIF1<0,則SKIPIF1<0的對(duì)稱軸為SKIPIF1<0;SKIPIF1<0,令SKIPIF1<0,解得SKIPIF1<0,則SKIPIF1<0的對(duì)稱中心為SKIPIF1<0;所以此時(shí)函數(shù)SKIPIF1<0符合題意,SKIPIF1<0,故C錯(cuò)誤;對(duì)于D,由選項(xiàng)C,SKIPIF1<0符合題意,則SKIPIF1<0,SKIPIF1<0,故D錯(cuò)誤.故選B.11.(2023屆河南省開(kāi)封市杞縣等4地高三三模)設(shè)定義在SKIPIF1<0上的函數(shù)SKIPIF1<0的導(dǎo)函數(shù)SKIPIF1<0,且滿足SKIPIF1<0,SKIPIF1<0.則SKIPIF1<0、SKIPIF1<0、SKIPIF1<0的大小關(guān)系為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,∴當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0單調(diào)遞增;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0單調(diào)遞減,∴SKIPIF1<0,∴SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,又SKIPIF1<0,理由如下:如圖,設(shè)SKIPIF1<0,射線SKIPIF1<0與單位圓相交于點(diǎn)SKIPIF1<0,過(guò)點(diǎn)SKIPIF1<0作SKIPIF1<0⊥SKIPIF1<0軸于點(diǎn)SKIPIF1<0,過(guò)點(diǎn)SKIPIF1<0作SKIPIF1<0⊥SKIPIF1<0軸交射線SKIPIF1<0于點(diǎn)SKIPIF1<0,連接SKIPIF1<0,設(shè)扇形SKIPIF1<0的面積為SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,其中SKIPIF1<0,故SKIPIF1<0,∴SKIPIF1<0.故選C12.(2023屆新疆烏魯木齊市等5地高三高考第二次適應(yīng)性檢測(cè))已知SKIPIF1<0,SKIPIF1<0都是定義在SKIPIF1<0上的函數(shù),對(duì)任意x,y滿足SKIPIF1<0,且SKIPIF1<0,則下列說(shuō)法正確的是(
)A.SKIPIF1<0 B.函數(shù)SKIPIF1<0的圖象關(guān)于點(diǎn)SKIPIF1<0對(duì)稱C.SKIPIF1<0 D.若SKIPIF1<0,則SKIPIF1<0【答案】D【解析】對(duì)于A,令SKIPIF1<0,代入已知等式得SKIPIF1<0,得SKIPIF1<0,故A錯(cuò)誤;對(duì)于B,取SKIPIF1<0,滿足SKIPIF1<0及SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0的圖象不關(guān)于點(diǎn)SKIPIF1<0對(duì)稱,所以函數(shù)SKIPIF1<0的圖象不關(guān)于點(diǎn)SKIPIF1<0對(duì)稱,故B錯(cuò)誤;對(duì)于C,令SKIPIF1<0,SKIPIF1<0,代入已知等式得SKIPIF1<0,可得SKIPIF1<0,結(jié)合SKIPIF1<0得SKIPIF1<0,SKIPIF1<0,再令SKIPIF1<0,代入已知等式得SKIPIF1<0,將SKIPIF1<0,SKIPIF1<0代入上式,得SKIPIF1<0,所以函數(shù)SKIPIF1<0為奇函數(shù).令SKIPIF1<0,SKIPIF1<0,代入已知等式,得SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,又因?yàn)镾KIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,故C錯(cuò)誤;對(duì)于D,分別令SKIPIF1<0和SKIPIF1<0,代入已知等式,得以下兩個(gè)等式:SKIPIF1<0,SKIPIF1<0,兩式相加易得SKIPIF1<0,所以有SKIPIF1<0,即:SKIPIF1<0,有:SKIPIF1<0,即:SKIPIF1<0,所以SKIPIF1<0為周期函數(shù),且周期為3,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,故D正確.故選D.二、多選題13.(2024屆山東省部分學(xué)校高三上學(xué)期聯(lián)考)已知函數(shù)SKIPIF1<0對(duì)SKIPIF1<0都有SKIPIF1<0,若函數(shù)SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對(duì)稱,且對(duì)SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),都有SKIPIF1<0,則下列結(jié)論正確的是(
)A.SKIPIF1<0B.SKIPIF1<0是奇函數(shù)C.SKIPIF1<0是周期為4的周期函數(shù)D.SKIPIF1<0【答案】AC【解析】B選項(xiàng),SKIPIF1<0的圖象關(guān)于直線SKIPIF1<0對(duì)稱,故SKIPIF1<0關(guān)于SKIPIF1<0軸對(duì)稱,SKIPIF1<0是偶函數(shù),B錯(cuò)誤;A選項(xiàng),SKIPIF1<0中,令SKIPIF1<0得:SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,解得:SKIPIF1<0,A正確;C選項(xiàng),由于SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0,即SKIPIF1<0是周期為4的周期函數(shù),C正確;D選項(xiàng),對(duì)SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),都有SKIPIF1<0,故SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,又SKIPIF1<0是周期為4的周期函數(shù),且SKIPIF1<0是偶函數(shù),故SKIPIF1<0,SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,D錯(cuò)誤.故選AC14.(2024屆廣東省深圳市福田區(qū)高三上學(xué)期模擬)已知函數(shù)SKIPIF1<0,則滿足SKIPIF1<0的整數(shù)SKIPIF1<0的取值可以是(
)A.SKIPIF1<0 B.0 C.1 D.2【答案】BCD【解析】由題意得SKIPIF1<0,故SKIPIF1<0為偶函數(shù),而SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,故SKIPIF1<0在SKIPIF1<0單調(diào)遞增,在SKIPIF1<0單調(diào)遞減,若SKIPIF1<0,則SKIPIF1<0,得SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,故選BCD15.(2023屆云南省曲靖市第二中學(xué)學(xué)聯(lián)體高三下學(xué)期第二次聯(lián)考)在平面直角坐標(biāo)系SKIPIF1<0中,如圖放置的邊長(zhǎng)為2的正方形SKIPIF1<0沿SKIPIF1<0軸滾動(dòng)(無(wú)滑動(dòng)滾動(dòng)),點(diǎn)SKIPIF1<0恰好經(jīng)過(guò)坐標(biāo)原點(diǎn),設(shè)頂點(diǎn)SKIPIF1<0的軌跡方程是SKIPIF1<0,則對(duì)函數(shù)SKIPIF1<0的判斷正確的是(
)
A.函數(shù)SKIPIF1<0是偶函數(shù)B.對(duì)任意的SKIPIF1<0,都有SKIPIF1<0C.函數(shù)SKIPIF1<0的值域?yàn)镾KIPIF1<0D.函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增【答案】ABC【解析】當(dāng)SKIPIF1<0時(shí),點(diǎn)B的軌跡是以SKIPIF1<0為圓心,2為半徑的四分之一圓;當(dāng)SKIPIF1<0時(shí),點(diǎn)B的軌跡是以SKIPIF1<0為圓心,SKIPIF1<0為半徑的四分之一圓;當(dāng)SKIPIF1<0時(shí),點(diǎn)B的軌跡是以SKIPIF1<0為圓心,2為半徑的四分之一圓.由圖可知,函數(shù)SKIPIF1<0是偶函數(shù),A正確;因?yàn)檎叫蔚闹荛L(zhǎng)為8,所以函數(shù)SKIPIF1<0是以8為周期的周期函數(shù),所以SKIPIF1<0,所以SKIPIF1<0,B正確;由圖可知,函數(shù)SKIPIF1<0的值域?yàn)镾KIPIF1<0,C正確;因?yàn)楹瘮?shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,所以由周期性可知函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,D錯(cuò)誤.故選ABC
16.(2024屆江蘇省蘇州市高三上學(xué)期期初調(diào)研)已知函數(shù)SKIPIF1<0定義域?yàn)镾KIPIF1<0,SKIPIF1<0是奇函數(shù),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0分別是函數(shù)SKIPIF1<0,SKIPIF1<0的導(dǎo)函數(shù),函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】ABD【解析】對(duì)于A,由SKIPIF1<0是奇函數(shù),則SKIPIF1<0,令SKIPIF1<0,有SKIPIF1<0,A正確.對(duì)于B,由SKIPIF1<0是奇函數(shù),則SKIPIF1<0,有SKIPIF1<0,所以SKIPIF1<0,B正確.對(duì)于C,由SKIPIF1<0,有SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0,C錯(cuò).對(duì)于D,由SKIPIF1<0知SKIPIF1<0關(guān)于直線SKIPIF1<0對(duì)稱,∵SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,∴SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)取等號(hào),令SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0解得SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則SKIPIF1<0,即SKIPIF1<0,有SKIPIF1<0.令SKIPIF1<0,SKIPIF1<0,SKIPIF1<0時(shí)SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,所以SKIPIF1<0,有SKIPIF1<0,即SKIPIF1<0.而SKIPIF1<0,∴SKIPIF1<0,D正確.故選ABD.17.(2024屆浙江省名校協(xié)作體高三上學(xué)期返校聯(lián)考)設(shè)定義在R上的函數(shù)SKIPIF1<0與SKIPIF1<0的導(dǎo)函數(shù)分別為SKIPIF1<0和SKIPIF1<0,若SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0為奇函數(shù),則下列說(shuō)法中一定正確的是(
)A.SKIPIF1<0 B.函數(shù)SKIPIF1<0的圖象關(guān)于SKIPIF1<0對(duì)稱C.SKIPIF1<0的周期為4 D.SKIPIF1<0【答案】AC【解析】A選項(xiàng),SKIPIF1<0為奇函數(shù),故SKIPIF1<0關(guān)于點(diǎn)SKIPIF1<0中心對(duì)稱,故SKIPIF1<0,故A正確;B選項(xiàng),SKIPIF1<0關(guān)于點(diǎn)SKIPIF1<0中心對(duì)稱,故SKIPIF1<0,取導(dǎo)數(shù)則SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0關(guān)于SKIPIF1<0軸對(duì)稱,故B錯(cuò)誤;C選項(xiàng),因?yàn)镾KIPIF1<0,故SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0,令SKIPIF1<0,得SKIPIF1<0,故SKIPIF1<0,故SKIPIF1<0,SKIPIF1<0關(guān)于SKIPIF1<0軸對(duì)稱,又SKIPIF1<0關(guān)于點(diǎn)SKIPIF1<0中心對(duì)稱,故SKIPIF1<0周期為4,則SKIPIF1<0,故SKIPIF1<0的周期為4,故C正確;D選項(xiàng),因?yàn)镾KIPIF1<0,SKIPIF1<0關(guān)于SKIPIF1<0軸對(duì)稱,所以SKIPIF1<0,因?yàn)镾KIPIF1<0關(guān)于點(diǎn)SKIPIF1<0中心對(duì)稱,周期為4,所以SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,而SKIPIF1<0的值不確定,故D錯(cuò)誤.故選AC三、填空題18.(2024屆新疆喀什地區(qū)澤普縣第二中學(xué)高三上學(xué)期第一次月考)已知函數(shù)SKIPIF1<0,若SKIPIF1<0,則實(shí)數(shù)SKIPIF1<0的取值范圍是【答案】SKIPIF1<0【解析】SKIPIF1<0定義域?yàn)镽,且SKIPIF1<0,故SKIPIF1<0為奇函數(shù),所以SKIPIF1<0,又SKIPIF1<0在R上單調(diào)遞減,所以SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<019.(2024屆江蘇省南通市海安市高三上學(xué)期期初學(xué)業(yè)質(zhì)量監(jiān)測(cè))已知定義在SKIPIF1<0上的函數(shù)SKIPIF1<0同時(shí)滿足下列三個(gè)條件:①SKIPIF1<0為奇函數(shù);②當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,③當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.則函數(shù)SKIPIF1<0的零點(diǎn)的個(gè)數(shù)為.【答案】5【解析】SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上為負(fù),SKIPIF1<0遞減;SKIPIF1<0在SKIPIF1<0為正,SKIPIF1<0遞增,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,作出SKIPIF1<0在SKIPIF1<0的圖象.
SKIPIF1<0時(shí),SKIPIF1<0,向上平移2個(gè)單位;SKIPIF1<0時(shí),SKIPIF1<0,再向上平移2個(gè)單位,SKIPIF1<0,SKIPIF1<0.縱軸右邊圖象與左邊圖形關(guān)于原點(diǎn)對(duì)稱,由圖可知函數(shù)SKIPIF1<0的圖象在縱軸右邊上有4個(gè)交點(diǎn),在縱軸左邊上有1個(gè)交點(diǎn)點(diǎn),∴SKIPIF1<0共有5個(gè)零點(diǎn).20.(2024屆福建省廈門(mén)市松柏中學(xué)高三上學(xué)期第一次月考)已知函數(shù)SKIPIF1<0是奇函數(shù),則SKIPIF1<0.【答案】SKIPIF1<0【解析】由題可得SKIPIF1<0定義域?yàn)镾KIPIF1<0,由定義域關(guān)于原點(diǎn)對(duì)稱可知SKIPIF1<0.則SKIPIF1<0,又SKIPIF1<0為奇函數(shù),則SKIPIF1<0.則SKIPIF1<0.21.(2024屆北京市豐臺(tái)區(qū)第二中學(xué)高三上學(xué)期開(kāi)學(xué)考)設(shè)SKIPIF1<0,函數(shù)SKIPIF1<0,給出下列四個(gè)結(jié)論:①SKIPIF1<0的單調(diào)遞增區(qū)間是SKIPIF1<0,單調(diào)遞減區(qū)間是SKIPIF1<0;②當(dāng)SKIPIF1<0時(shí),SKIPIF1<0沒(méi)有最大值,也沒(méi)有最小值;③設(shè)SKIPIF1<0,則SKIPIF1<0沒(méi)有最小值;④設(shè)SKIPIF1<0,則SKIPIF1<0時(shí),SKIPIF1<0有最小值.其中所有正確結(jié)論的序號(hào)是.【答案】②③④【解析】對(duì)于①,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,此時(shí),函數(shù)SKIPIF1<0在SKIPIF1<0上不可能單調(diào)遞增,①錯(cuò);對(duì)于②,當(dāng)SKIPIF1<0時(shí),若SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.且SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0SKIPIF1<0,此時(shí),函數(shù)SKIPIF1<0的值域?yàn)镾KIPIF1<0,故當(dāng)SKIPIF1<0時(shí),SKIPIF1<0沒(méi)有最大值,也沒(méi)有最小值,②對(duì);對(duì)于③,當(dāng)SKIPIF1<0時(shí),由SKIPIF1<0整理可得SKIPIF1<0,則曲線SKIPIF1<0表示圓SKIPIF1<0的上半圓,作出函數(shù)SKIPIF1<0的圖象如下圖所示:記點(diǎn)SKIPIF1<0、SKIPIF1<0,則SKIPIF1<0,因?yàn)镾KIPIF1<0,SKIPIF1<0,由圖可知,SKIPIF1<0,則SKIPIF1<0沒(méi)有最小值,③對(duì);對(duì)于④,因?yàn)镾KIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),過(guò)原點(diǎn)且垂直于直線SKIPIF1<0的直線的方程為SKIPIF1<0,聯(lián)立SKIPIF1<0可得SKIPIF1<0,若SKIPIF1<0存在最小值,則點(diǎn)SKIPIF1<0在射線SKIPIF1<0上,則SKIPIF1<0,解得SKIPIF1<0,此時(shí),原點(diǎn)到直線SKIPIF1<0的距離為SKIPIF1<0,SKIPIF1<0,④對(duì).22.(2024屆遼寧省沈陽(yáng)市第一二〇中學(xué)高三上學(xué)期第一次質(zhì)量監(jiān)測(cè))對(duì)于給定的區(qū)間SKIPIF1<0
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