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專題08活用三角函數(shù)的圖象與性質(zhì)目錄01齊次化模型 102輔助角與最值問題 403整體代換與二次函數(shù)模型 704絕對(duì)值與三角函數(shù)綜合模型 905w的取值與范圍問題 1306三角函數(shù)的綜合性質(zhì) 1901齊次化模型1.(2021?新高考Ⅰ)若SKIPIF1<0,則SKIPIF1<0SKIPIF1<0A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】SKIPIF1<0【解析】由題意可得:SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0.故選:SKIPIF1<0.2.(2023·廣東廣州·高三廣州市第十六中學(xué)??茧A段練習(xí))已知SKIPIF1<0,則SKIPIF1<0(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】由題意知SKIPIF1<0,則SKIPIF1<0SKIPIF1<0,故選:D3.(2023·江蘇徐州·高三??茧A段練習(xí))若SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0.【答案】SKIPIF1<0【解析】因?yàn)镾KIPIF1<0,所以SKIPIF1<0因?yàn)镾KIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0,故答案為:SKIPIF1<0.4.(2023·山西晉中·高二榆次一中??奸_學(xué)考試)已知SKIPIF1<0,則SKIPIF1<0.【答案】SKIPIF1<0/SKIPIF1<0【解析】由SKIPIF1<0,則SKIPIF1<0,又SKIPIF1<0.故答案為:SKIPIF1<0.5.(2023·江西九江·高一校聯(lián)考期末)若SKIPIF1<0,則SKIPIF1<0的值是.【答案】SKIPIF1<0【解析】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0,故答案為:SKIPIF1<06.(2023·天津河西·高三天津市新華中學(xué)??计谀┮阎本€SKIPIF1<0的一個(gè)方向向量為SKIPIF1<0,傾斜角為SKIPIF1<0,則SKIPIF1<0.【答案】-1【解析】因?yàn)橹本€SKIPIF1<0的一個(gè)方向向量為SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0.故答案為:SKIPIF1<0.7.(2021?甲卷)若SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0SKIPIF1<0A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】SKIPIF1<0【解析】由SKIPIF1<0,得SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,解得SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0.故選:SKIPIF1<0.8.(2023·全國(guó)·模擬預(yù)測(cè))已知SKIPIF1<0,則SKIPIF1<0.【答案】SKIPIF1<0【解析】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0.故答案為:SKIPIF1<002輔助角與最值問題9.(2023·全國(guó)·高三專題練習(xí))實(shí)數(shù)SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0的范圍是.【答案】SKIPIF1<0【解析】SKIPIF1<0SKIPIF1<0.故令SKIPIF1<0,SKIPIF1<0.則原式SKIPIF1<0SKIPIF1<0,故SKIPIF1<0.故答案為:SKIPIF1<0.10.(2023·江西·統(tǒng)考模擬預(yù)測(cè))記SKIPIF1<0的面積為SKIPIF1<0,內(nèi)角SKIPIF1<0所對(duì)的邊分別為SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0的值為.【答案】SKIPIF1<0【解析】由題得SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)等號(hào)成立,又SKIPIF1<0,其中SKIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0.故答案為:SKIPIF1<011.(2023·全國(guó)·高三專題練習(xí))SKIPIF1<0的取值范圍是.【答案】SKIPIF1<0【解析】SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0由SKIPIF1<0,得SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0,即SKIPIF1<0時(shí)取等號(hào),且SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0,即SKIPIF1<0時(shí)取等號(hào),所以SKIPIF1<0的取值范圍為SKIPIF1<0.故答案為:SKIPIF1<012.(2023·上海寶山·高三上海交大附中??茧A段練習(xí))已知實(shí)數(shù)SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0的最大值為.【答案】SKIPIF1<0【解析】設(shè)SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0或SKIPIF1<0,故SKIPIF1<0或SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0SKIPIF1<0,其中SKIPIF1<0,SKIPIF1<0,因?yàn)镾KIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)等號(hào)成立,故SKIPIF1<0的最大值為SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0SKIPIF1<0,其中SKIPIF1<0,SKIPIF1<0,因?yàn)镾KIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)等號(hào)成立,故SKIPIF1<0的最大值為SKIPIF1<0.綜上,SKIPIF1<0的最大值為SKIPIF1<0.故答案為:SKIPIF1<0.13.(2023·江西·高三校聯(lián)考階段練習(xí))當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0取得最大值,則SKIPIF1<0.【答案】SKIPIF1<0【解析】利用輔助角公式SKIPIF1<0,其中SKIPIF1<0當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0取得最大值,則SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0又SKIPIF1<0,所以SKIPIF1<0故答案為:SKIPIF1<0.03整體代換與二次函數(shù)模型14.(2023·廣東汕頭·金山中學(xué)校考三模)函數(shù)SKIPIF1<0的最大值為(

)A.4 B.5 C.6 D.7【答案】B【解析】函數(shù)SKIPIF1<0SKIPIF1<0,由于SKIPIF1<0,故SKIPIF1<0,由于函數(shù)SKIPIF1<0的對(duì)稱軸為SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0取得最大值SKIPIF1<0,故選:B15.(2023·山西·統(tǒng)考一模)在SKIPIF1<0中,角SKIPIF1<0所對(duì)的邊分別為SKIPIF1<0.若SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0的最大值是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.1 D.SKIPIF1<0【答案】B【解析】由正弦定理與SKIPIF1<0得SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0,又SKIPIF1<0,所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0取得最大值SKIPIF1<0,故選:B.16.(2023·重慶渝中·高三統(tǒng)考期中)函數(shù)SKIPIF1<0的最大值為(

)A.2 B.SKIPIF1<0 C.0 D.SKIPIF1<0【答案】A【解析】SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0,則SKIPIF1<0,所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以函數(shù)SKIPIF1<0的最大值為SKIPIF1<0.故選:A.17.(2023·遼寧·校聯(lián)考模擬預(yù)測(cè))已知函數(shù)SKIPIF1<0是偶函數(shù),則函數(shù)SKIPIF1<0的最大值為(

)A.1 B.2 C.SKIPIF1<0 D.3【答案】C【解析】由偶函數(shù)的定義SKIPIF1<0化簡(jiǎn)可求得SKIPIF1<0,則SKIPIF1<0,借助基本不等式和余弦函數(shù)性質(zhì)即可得解.因?yàn)楹瘮?shù)SKIPIF1<0是偶函數(shù),所以SKIPIF1<0,即SKIPIF1<0,化簡(jiǎn)可得:SKIPIF1<0,解得:SKIPIF1<0,即SKIPIF1<0.又因?yàn)镾KIPIF1<0,SKIPIF1<0,所以SKIPIF1<0(當(dāng)且僅當(dāng)SKIPIF1<0時(shí)兩個(gè)“SKIPIF1<0”同時(shí)成立).故選:C.18.(2023·高一課時(shí)練習(xí))已知SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0的最大值為A.SKIPIF1<0 B.2 C.4 D.SKIPIF1<0【答案】B【解析】∵SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0.∵SKIPIF1<0,∴SKIPIF1<0.故選B.04絕對(duì)值與三角函數(shù)綜合模型19.(2023·安徽·蕪湖一中校聯(lián)考模擬預(yù)測(cè))已知函數(shù)SKIPIF1<0,以下結(jié)論正確的是(

)A.SKIPIF1<0是SKIPIF1<0的一個(gè)周期 B.函數(shù)在SKIPIF1<0單調(diào)遞減C.函數(shù)SKIPIF1<0的值域?yàn)镾KIPIF1<0 D.函數(shù)SKIPIF1<0在SKIPIF1<0內(nèi)有6個(gè)零點(diǎn)【答案】C【解析】因?yàn)镾KIPIF1<0,所以A錯(cuò)誤;當(dāng)SKIPIF1<0,SKIPIF1<0SKIPIF1<0,其中SKIPIF1<0,不妨令SKIPIF1<0為銳角,所以SKIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以B錯(cuò)誤;因?yàn)镾KIPIF1<0是函數(shù)SKIPIF1<0的一個(gè)周期,可取一個(gè)周期SKIPIF1<0上研究值域,當(dāng)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0;因?yàn)镾KIPIF1<0關(guān)于SKIPIF1<0對(duì)稱,所以當(dāng)SKIPIF1<0時(shí)SKIPIF1<0,故函數(shù)SKIPIF1<0在SKIPIF1<0上的值域?yàn)镾KIPIF1<0,故C正確;因?yàn)楹瘮?shù)SKIPIF1<0為偶函數(shù),所以在區(qū)間SKIPIF1<0上零點(diǎn)個(gè)數(shù)可通過區(qū)間SKIPIF1<0上零點(diǎn)個(gè)數(shù),由SKIPIF1<0,SKIPIF1<0在SKIPIF1<0圖像知由2個(gè)零點(diǎn),所以在區(qū)間SKIPIF1<0上零點(diǎn)個(gè)數(shù)為4個(gè),所以D錯(cuò)誤.故選:C.20.(2023·廣西·柳州高級(jí)中學(xué)校考二模)設(shè)函數(shù)SKIPIF1<0,下述四個(gè)結(jié)論:①SKIPIF1<0是偶函數(shù);

②SKIPIF1<0的最小正周期為SKIPIF1<0;③SKIPIF1<0的最小值為0;

④SKIPIF1<0在SKIPIF1<0上有3個(gè)零點(diǎn)其中所有正確結(jié)論的編號(hào)是(

)A.①② B.①②③ C.①③④ D.②③④【答案】B【解析】因?yàn)楹瘮?shù)f(x)定義域?yàn)镽,而且f(﹣x)=cos|2x|+|sinx|=f(x),所以f(x)是偶函數(shù),①正確;因?yàn)楹瘮?shù)y=cos|2x|的最小正周期為π,y=|sinx|的最小正周期為π,所以f(x)的最小正周期為π,②正確;f(x)=cos|2x|+|sinx|=cos2x+|sinx|=1﹣2sin2x+|sinx|=﹣2(|sinx|SKIPIF1<0)2SKIPIF1<0,而|sinx|∈[0,1],所以當(dāng)|sinx|=1時(shí),f(x)的最小值為0,③正確;由上可知f(x)=0可得1﹣2sin2x+|sinx|=0,解得|sinx|=1或|sinx|SKIPIF1<0(舍去)因此在[0,2π]上只有xSKIPIF1<0或xSKIPIF1<0,所以④不正確.故選:B.21.(2023·河南鄭州·高三統(tǒng)考階段練習(xí))關(guān)于函數(shù)SKIPIF1<0有下述四個(gè)結(jié)論:①SKIPIF1<0是偶函數(shù);②SKIPIF1<0的最大值為2;③SKIPIF1<0在區(qū)間SKIPIF1<0上有3個(gè)零點(diǎn);④SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增.其中正確結(jié)論的個(gè)數(shù)為(

)A.0 B.1 C.2 D.3【答案】C【解析】利用函數(shù)的奇偶性的概念判斷①,然后分類討論確定函數(shù)SKIPIF1<0在每一段上的最值,判斷②是否正確;分別分析函數(shù)SKIPIF1<0在SKIPIF1<0和SKIPIF1<0上的零點(diǎn)個(gè)數(shù),判斷③是否正確;再分析當(dāng)SKIPIF1<0時(shí),則SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞性判斷④是否正確.對(duì)于①,函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,關(guān)于原點(diǎn)對(duì)稱,且SKIPIF1<0,該函數(shù)為偶函數(shù),①正確;對(duì)于②,當(dāng)SKIPIF1<0(SKIPIF1<0)時(shí),SKIPIF1<0,此時(shí)SKIPIF1<0(SKIPIF1<0),當(dāng)SKIPIF1<0(SKIPIF1<0)時(shí),函數(shù)SKIPIF1<0取得最大值SKIPIF1<0;當(dāng)SKIPIF1<0(SKIPIF1<0)時(shí),SKIPIF1<0,此時(shí)SKIPIF1<0(SKIPIF1<0),當(dāng)SKIPIF1<0(SKIPIF1<0)時(shí),函數(shù)SKIPIF1<0取得最大值SKIPIF1<0.根據(jù)函數(shù)SKIPIF1<0的對(duì)稱性可知,函數(shù)SKIPIF1<0的最大值為SKIPIF1<0,②錯(cuò)誤;對(duì)于③,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,此時(shí)SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,此時(shí)SKIPIF1<0.所以函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上有且只有兩個(gè)零點(diǎn),故③錯(cuò)誤;對(duì)于④,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,且SKIPIF1<0,所以函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增,④正確.因此,正確結(jié)論的個(gè)數(shù)為2.故選:C.22.(2023·湖南常德·高三湖南省桃源縣第一中學(xué)校考階段練習(xí))函數(shù)SKIPIF1<0的最大值為.【答案】SKIPIF1<0【解析】因?yàn)镾KIPIF1<0的定義域?yàn)镾KIPIF1<0,SKIPIF1<0所以SKIPIF1<0為偶函數(shù),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0SKIPIF1<0,SKIPIF1<0,所以當(dāng)SKIPIF1<0時(shí),函數(shù)取得最大值SKIPIF1<0,綜上可知函數(shù)的最大值SKIPIF1<0,故答案為:SKIPIF1<005w的取值與范圍問題23.(2023·福建泉州·統(tǒng)考模擬預(yù)測(cè))已知函數(shù)SKIPIF1<0(SKIPIF1<0)在SKIPIF1<0內(nèi)有且僅有3個(gè)零點(diǎn),則SKIPIF1<0的值可以是(

)A.3 B.5 C.7 D.9【答案】B【解析】由于SKIPIF1<0(SKIPIF1<0)在SKIPIF1<0內(nèi)有且僅有3個(gè)零點(diǎn),所以方程SKIPIF1<0(SKIPIF1<0)在SKIPIF1<0內(nèi)恰有三個(gè)不相等的實(shí)數(shù)根,即SKIPIF1<0與直線SKIPIF1<0在SKIPIF1<0內(nèi)恰有三個(gè)交點(diǎn).令SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0與直線SKIPIF1<0在SKIPIF1<0(SKIPIF1<0)內(nèi)恰有三個(gè)交點(diǎn).令SKIPIF1<0,解得:SKIPIF1<0(SKIPIF1<0)或SKIPIF1<0(SKIPIF1<0),又SKIPIF1<0,SKIPIF1<0且滿足條件的SKIPIF1<0恰有三個(gè)值,則SKIPIF1<0,解得:SKIPIF1<0,故選:B.24.(2023·山西呂梁·高三校聯(lián)考開學(xué)考試)已知函數(shù)SKIPIF1<0的最小正周期為SKIPIF1<0,若SKIPIF1<0,且SKIPIF1<0在區(qū)間SKIPIF1<0上恰有SKIPIF1<0個(gè)零點(diǎn),則SKIPIF1<0的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】由題意SKIPIF1<0的最小正周期為T,則SKIPIF1<0,又SKIPIF1<0,可得SKIPIF1<0,即SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0在區(qū)間SKIPIF1<0上恰有3個(gè)零點(diǎn),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,結(jié)合函數(shù)SKIPIF1<0的圖象如圖所示:則SKIPIF1<0在原點(diǎn)右側(cè)的零點(diǎn)依次為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,…,所以SKIPIF1<0,解得SKIPIF1<0,即SKIPIF1<0的取值范圍為SKIPIF1<0.故選:D.25.(2023·云南保山·高一統(tǒng)考期末)已知函數(shù)SKIPIF1<0,若SKIPIF1<0在區(qū)間SKIPIF1<0上不存在零點(diǎn),則SKIPIF1<0的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】由題意得SKIPIF1<0,SKIPIF1<0在區(qū)間SKIPIF1<0上不存在零點(diǎn),設(shè)SKIPIF1<0的最小正周期為T,則SKIPIF1<0,又函數(shù)SKIPIF1<0的零點(diǎn)滿足SKIPIF1<0,即SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0,因?yàn)镾KIPIF1<0,故SKIPIF1<0,則SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0,結(jié)合SKIPIF1<0得SKIPIF1<0,由于SKIPIF1<0在區(qū)間SKIPIF1<0上不存在零點(diǎn),故在SKIPIF1<0的范圍內(nèi)去除SKIPIF1<0和SKIPIF1<0,則SKIPIF1<0,故選:B26.(2023?新高考Ⅰ)已知函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0,SKIPIF1<0有且僅有3個(gè)零點(diǎn),則SKIPIF1<0的取值范圍是.【答案】SKIPIF1<0,SKIPIF1<0【解析】SKIPIF1<0,SKIPIF1<0,函數(shù)的周期為SKIPIF1<0,SKIPIF1<0,可得SKIPIF1<0,函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0,SKIPIF1<0有且僅有3個(gè)零點(diǎn),可得SKIPIF1<0,所以SKIPIF1<0.故答案為:SKIPIF1<0,SKIPIF1<0.27.(2023·四川·校聯(lián)考一模)將函數(shù)SKIPIF1<0的圖象先向左平移SKIPIF1<0個(gè)單位長(zhǎng)度,再把所得函數(shù)圖象的橫、縱坐標(biāo)都變?yōu)樵瓉淼腟KIPIF1<0倍,得到函數(shù)SKIPIF1<0的圖象,若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)沒有零點(diǎn),則SKIPIF1<0的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】將函數(shù)SKIPIF1<0的圖象向左平移SKIPIF1<0個(gè)單位長(zhǎng)度,得到SKIPIF1<0,再把所得函數(shù)圖象的橫、縱坐標(biāo)都變?yōu)樵瓉淼腟KIPIF1<0倍,得到函數(shù)SKIPIF1<0的圖象,即SKIPIF1<0,因?yàn)楹瘮?shù)SKIPIF1<0在SKIPIF1<0上沒有零點(diǎn),則SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0,若函數(shù)SKIPIF1<0在SKIPIF1<0上有零點(diǎn),則SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,又SKIPIF1<0,則SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),解得SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),解得SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),解得SKIPIF1<0,與SKIPIF1<0矛盾.綜上,若函數(shù)SKIPIF1<0在SKIPIF1<0上有零點(diǎn),則SKIPIF1<0或SKIPIF1<0,則若沒有零點(diǎn),則SKIPIF1<0或SKIPIF1<0.故選:C.28.(2022?甲卷)設(shè)函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0恰有三個(gè)極值點(diǎn)、兩個(gè)零點(diǎn),則SKIPIF1<0的取值范圍是SKIPIF1<0SKIPIF1<0A.SKIPIF1<0,SKIPIF1<0 B.SKIPIF1<0,SKIPIF1<0 C.SKIPIF1<0,SKIPIF1<0 D.SKIPIF1<0,SKIPIF1<0【答案】SKIPIF1<0【解析】當(dāng)SKIPIF1<0時(shí),不能滿足在區(qū)間SKIPIF1<0極值點(diǎn)比零點(diǎn)多,所以SKIPIF1<0;函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0恰有三個(gè)極值點(diǎn)、兩個(gè)零點(diǎn),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0SKIPIF1<0,求得SKIPIF1<0,故選:SKIPIF1<0.29.(2022?甲卷)將函數(shù)SKIPIF1<0的圖像向左平移SKIPIF1<0個(gè)單位長(zhǎng)度后得到曲線SKIPIF1<0,若SKIPIF1<0關(guān)于SKIPIF1<0軸對(duì)稱,則SKIPIF1<0的最小值是SKIPIF1<0SKIPIF1<0A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】SKIPIF1<0【解析】將函數(shù)SKIPIF1<0的圖像向左平移SKIPIF1<0個(gè)單位長(zhǎng)度后得到曲線SKIPIF1<0,則SKIPIF1<0對(duì)應(yīng)函數(shù)為SKIPIF1<0,SKIPIF1<0的圖象關(guān)于SKIPIF1<0軸對(duì)稱,SKIPIF1<0SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,則令SKIPIF1<0,可得SKIPIF1<0的最小值是SKIPIF1<0,故選:SKIPIF1<0.30.(2023·湖北恩施·高一利川市第一中學(xué)校聯(lián)考期末)已知函數(shù)SKIPIF1<0SKIPIF1<0,且SKIPIF1<0,都有SKIPIF1<0,則SKIPIF1<0的取值范圍可能是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】由SKIPIF1<0,得SKIPIF1<0,設(shè)SKIPIF1<0,由于SKIPIF1<0,且SKIPIF1<0,時(shí)SKIPIF1<0,可知SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,由正弦函數(shù)性質(zhì)可知SKIPIF1<0,故當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,即SKIPIF1<0時(shí),即SKIPIF1<0時(shí),已知不等式成立,故選項(xiàng)A正確,B錯(cuò)誤;對(duì)于選項(xiàng)C,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,顯然此時(shí)的SKIPIF1<0在SKIPIF1<0上不是單調(diào)遞減,故選項(xiàng)C錯(cuò)誤;對(duì)于選項(xiàng)D,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,顯然此時(shí)的SKIPIF1<0在SKIPIF1<0上不是單調(diào)遞減,故選項(xiàng)D錯(cuò)誤;故選:A31.(2023·江蘇揚(yáng)州·高一??计谀┮阎猄KIPIF1<0SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0且SKIPIF1<0在SKIPIF1<0上單調(diào),則SKIPIF1<0的最大值為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】SKIPIF1<0SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上單調(diào),SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0當(dāng)SKIPIF1<0時(shí)SKIPIF1<0最大,最大值為SKIPIF1<0,故選:B.32.(2023·浙江金華·高三校聯(lián)考階段練習(xí))已知函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,且當(dāng)SKIPIF1<0時(shí),SKIPIF1<0恒成立,則SKIPIF1<0的取值范圍為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】由已知,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0,解得:SKIPIF1<0,由于SKIPIF1<0,所以SKIPIF1<0,解得:SKIPIF1<0①又因?yàn)楹瘮?shù)SKIPIF1<0在SKIPIF1<0上SKIPIF1<0恒成立,所以SKIPIF1<0,解得:SKIPIF1<0,由于SKIPIF1<0,所以SKIPIF1<0,解得:SKIPIF1<0②又因?yàn)镾KIPIF1<0,當(dāng)SKIPIF1<0時(shí),由①②可知:SKIPIF1<0,解得SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),由①②可知:SKIPIF1<0,解得SKIPIF1<0.所以SKIPIF1<0的取值范圍為SKIPIF1<0.故選:B.06三角函數(shù)的綜合性質(zhì)33.(多選題)(2023·安徽·高三校聯(lián)考階段練習(xí))已知函數(shù)SKIPIF1<0,SKIPIF1<0,則以下結(jié)論正確的是(

)A.函數(shù)SKIPIF1<0的最小正周期為SKIPIF1<0B.函數(shù)SKIPIF1<0的圖象關(guān)于點(diǎn)SKIPIF1<0成中心對(duì)稱C.函數(shù)SKIPIF1<0與SKIPIF1<0的圖象有偶數(shù)個(gè)交點(diǎn)D.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0【答案】ABD【解析】對(duì)于選項(xiàng)A:因?yàn)镾KIPIF1<0,所以函數(shù)SKIPIF1<0的最小正周期為SKIPIF1<0,故A正確;對(duì)于選項(xiàng)B:因?yàn)镾KIPIF1<0,所以函數(shù)SKIPIF1<0的圖象關(guān)于點(diǎn)SKIPIF1<0成中心對(duì)稱,故B正確;對(duì)于選項(xiàng)C:因?yàn)镾KIPIF1<0,所以函數(shù)SKIPIF1<0的圖象關(guān)于點(diǎn)SKIPIF1<0成中心對(duì)稱,即函數(shù)SKIPIF1<0與SKIPIF1<0的圖象均關(guān)于點(diǎn)SKIPIF1<0成中心對(duì)稱,因?yàn)镾KIPIF1<0,即SKIPIF1<0為函數(shù)SKIPIF1<0與SKIPIF1<0的一個(gè)交點(diǎn),當(dāng)SKIPIF1<0,函數(shù)SKIPIF1<0與SKIPIF1<0的圖象有SKIPIF1<0個(gè)交點(diǎn),則當(dāng)SKIPIF1<0,函數(shù)SKIPIF1<0與SKIPIF1<0的圖象有SKIPIF1<0個(gè)交點(diǎn),綜上所述:函數(shù)SKIPIF1<0與SKIPIF1<0的圖象有SKIPIF1<0個(gè)交點(diǎn),為奇數(shù)個(gè),故C錯(cuò)誤;對(duì)于選項(xiàng)D:當(dāng)SKIPIF1<0時(shí),則SKIPIF1<0,所以SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,故D正確;故選:ABD.34.(多選題)(2023·山東泰安·高三統(tǒng)考期中)已知函數(shù)SKIPIF1<0的圖象如圖所示,則(

)A.SKIPIF1<0B.函數(shù)SKIPIF1<0的一個(gè)對(duì)稱中心為SKIPIF1<0C.SKIPIF1<0是函數(shù)SKIPIF1<0的一個(gè)周期D.將函數(shù)SKIPIF1<0的圖象向左平移SKIPIF1<0個(gè)單位長(zhǎng)度可得函數(shù)SKIPIF1<0的圖象【答案】BCD【解析】由圖可知,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,故A錯(cuò)誤;對(duì)于B,因?yàn)镾KIPIF1<0,所以函數(shù)SKIPIF1<0的一個(gè)對(duì)稱中心為SKIPIF1<0,故B正確;對(duì)于C,因?yàn)楹瘮?shù)SKIPIF1<0的最小正周期為SKIPIF1<0,所以SKIPIF1<0是函數(shù)SKIPIF1<0的一個(gè)周期,故C正確;對(duì)于D,將函數(shù)SKIPIF1<0的圖象向左平移SKIPIF1<0個(gè)單位長(zhǎng)度,得SKIPIF1<0,故D正確.故選:BCD.35.(多選題)(2023·河南·方城第一高級(jí)中學(xué)校聯(lián)考模擬預(yù)測(cè))已知函數(shù)SKIPIF1<0(SKIPIF1<0,SKIPIF1<0,SKIPIF1<0)的部分圖象如圖所示,則(

)A.SKIPIF1<0,SKIPIF1<0B.將函數(shù)SKIPIF1<0的圖象向左平移SKIPIF1<0個(gè)單位長(zhǎng)度,得到SKIPIF1<0的圖象C.點(diǎn)SKIPIF1<0為SKIPIF1<0圖象的一個(gè)對(duì)稱中心D.函數(shù)SKIPIF1<0在SKIPIF1<0上的值域?yàn)镾KIPIF1<0【答案】BD【解析】對(duì)于選項(xiàng)A:根據(jù)圖象可知SKIPIF1<0,解得SKIPIF1<0,則SKIPIF1<0,又因?yàn)镾KIPIF1<0,且圖象過SKIPIF1<0,可得SKIPIF1<0,則SKIPIF1<0,解得SKIPIF1<0則SKIPIF1<0,則SKIPIF1<0,故A錯(cuò)誤;對(duì)于選項(xiàng)B:因?yàn)楹瘮?shù)SKIPIF1<0,將函數(shù)SKIPIF1<0的圖象向左平移SKIPIF1<0個(gè)單位長(zhǎng)度,得到SKIPIF1<0的圖象,故B正確;對(duì)于選項(xiàng)C:因?yàn)镾KIPIF1<0,所以點(diǎn)SKIPIF1<0不是SKIPIF1<0的對(duì)稱中心,故C錯(cuò)誤;對(duì)于選項(xiàng)D:當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,此時(shí)函數(shù)SKIPIF1<0的值域?yàn)镾KIPIF1<0,故D正確.故選:BD.36.(多選題)(2023·安徽合肥·高三合肥一中??茧A段練習(xí))已知函數(shù)SKIPIF1<0是偶函數(shù),其圖象的兩個(gè)相鄰對(duì)稱軸間的距離為SKIPIF1<0,將函數(shù)SKIPIF1<0的圖象向右平移SKIPIF1<0個(gè)單位長(zhǎng)度得到函數(shù)SKIPIF1<0的圖象,則(

)A.SKIPIF1<0 B.SKIPIF1<0在SKIPIF1<0上單調(diào)遞增C.函數(shù)SKIPIF1<0的圖象關(guān)于點(diǎn)SKIPIF1<0對(duì)稱 D.函數(shù)SKIPIF1<0的圖象在SKIPIF1<0處取得極大值【答案】ABC【解析】對(duì)于A,SKIPIF1<0圖象的兩個(gè)相鄰對(duì)稱軸間的距離為SKIPIF1<0,SKIPIF1<0的最小正周期SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為偶函數(shù),SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,A正確;對(duì)于B,SKIPIF1<0,則當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,B正確;對(duì)于C,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0SKIPIF1<0是SKIPIF1<0的一個(gè)對(duì)稱中心,又SKIPIF1<0,SKIPIF1<0的圖象關(guān)于點(diǎn)SKIPIF1<0對(duì)稱,C正確;對(duì)于D,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0不是SKIPIF1<0的極大值點(diǎn),SKIPIF1<0不是SKIPIF1<0的極大值點(diǎn),D錯(cuò)誤.故選:ABC.37.(多選題)(2023·全國(guó)·模擬預(yù)測(cè))已知函數(shù)SKIPIF1<0,則(

)A.SKIPIF1<0的最大值為4B.若SKIPIF1<0的最小正周期為SKIPIF1<0,則SKIPIF1<0C.當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0圖象的對(duì)稱中心為點(diǎn)SKIPIF1<0D.當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0在SKIPIF1<0上的圖象與直SKIPIF1<0所圍成的平面圖形的面積為SKIPIF1<0【答案】ACD【解析】SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0,選項(xiàng)A:當(dāng)SKIPIF1<0時(shí),SKIPIF1<0取得最大值4,所以A正確;選項(xiàng)B:若SKIPIF1<0的最小正周期為SKIPIF1<0且SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,所以B不正確;選項(xiàng)C:當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0,令SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0圖象的對(duì)稱中心為點(diǎn)SKIPIF1<0,所以C正確;選項(xiàng)D:當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0,在平面直角坐標(biāo)系內(nèi)作出SKIPIF1<0的圖象與直線SKIPIF1<0所圍成的平面圖形,如圖1中陰影部分所示.

圖1解法一:由圖可將陰影部分的面積轉(zhuǎn)化為SKIPIF1<0的面積,如圖2所示,易求得SKIPIF1<0的面積為SKIPIF1<0,所以D正確.

圖2解法二:由圖可將陰影部分的面積轉(zhuǎn)化為矩形SKIPIF1<0的面積的一半,如圖3所示,易求得矩形SKIPIF1<0的面積為SKIPIF1<0,所以曲邊圖形的面積為SKIPIF1<0,所以D正確.

圖3故選:ACD38.(多選題)(2023·山東濟(jì)南·高三山東省實(shí)驗(yàn)中學(xué)??茧A段練習(xí))已知函數(shù)SKIPIF1<0為SKIPIF1<0的兩個(gè)極值點(diǎn),且SKIPIF1<0的最小值為SKIPIF1<0,直線SKIPIF1<0為SKIPIF1<0圖象的一條對(duì)稱軸,將SKIPIF1<0的圖象向右平移SKIPIF1<0個(gè)單位長(zhǎng)度后得到函數(shù)SKIPIF1<0的圖象,下列結(jié)論正確的是(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0在間SKIPIF1<0上單調(diào)遞增 D.SKIPIF1<0圖象關(guān)于點(diǎn)SKIPIF1<0對(duì)稱【答案】BCD【解析】因?yàn)镾KIPIF1<0為SKIPIF1<0的兩個(gè)極值點(diǎn),且SKIPIF1<0的最小值為SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,故A錯(cuò)誤;則SKIPIF1<0,又直線SKIPIF1<0為SKIPIF1<0圖象的一條對(duì)稱軸,所以SKIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,故B正確;所以SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<0,所以SKIPIF1<0在間SKIPIF1<0上單調(diào)遞增,故C正確;將SKIPIF1<0的圖象向右平移SKIPIF1<0個(gè)單位長(zhǎng)度后得到函數(shù)SKIPIF1<0的圖象,則SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0圖象關(guān)于點(diǎn)SKIPIF1<0對(duì)稱,故D正確.故選:BCD.39.(2022?新高考Ⅰ)記函數(shù)SKIPIF1<0的最小正周期為SKIPIF1<0.若SKIPIF1<0,且SKIPIF1<0的圖像關(guān)于點(diǎn)SKIPIF1<0,SKIPIF1<0中心對(duì)稱,則SKIPIF1<0SKIPIF1<0A.1 B.SKIPIF1<0 C.SKIPIF1<0 D.3【答案】SKIPIF1<0【解析】函數(shù)SKIPIF1<0的最小正周期為SKIPIF1<0,則SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<

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