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專題03一網(wǎng)打盡指對冪等函數(shù)值比較大小問題目錄01直接利用單調(diào)性 102引入媒介值 203含變量問題 404構(gòu)造函數(shù) 705數(shù)形結(jié)合 1506特殊值法、估算法 2107放縮法、同構(gòu)法 2308不定方程 3409泰勒展開 3801直接利用單調(diào)性1.(2023·安徽·高三校聯(lián)考階段練習(xí))已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則a、b、c的大小順序?yàn)椋ǎ〢.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】SKIPIF1<0,又SKIPIF1<0,因?yàn)镾KIPIF1<0,SKIPIF1<0單調(diào)遞增,所以SKIPIF1<0.故選:C2.(2023·甘肅·模擬預(yù)測)三個(gè)數(shù)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0的大小順序是(
)A.SKIPIF1<0>SKIPIF1<0>SKIPIF1<0 B.SKIPIF1<0>SKIPIF1<0>SKIPIF1<0C.SKIPIF1<0>SKIPIF1<0>SKIPIF1<0 D.SKIPIF1<0>SKIPIF1<0>SKIPIF1<0【答案】C【解析】由函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則SKIPIF1<0又由于SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,則SKIPIF1<0故SKIPIF1<0故選:C3.(2023·安徽·高三校聯(lián)考階段練習(xí))已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則a、b、c的大小順序?yàn)椋ǎ〢.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】由SKIPIF1<0,故SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0SKIPIF1<0故選:D02引入媒介值4.(2023·高三新疆石河子一中校考階段練習(xí))設(shè)SKIPIF1<0,則a,b,c的大小順序是()A.c<a<b B.c<b<aC.a(chǎn)<c<b D.b<c<a【答案】B【解析】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0;SKIPIF1<0.故選:B.5.(2023·遼寧·高三東北育才學(xué)校校聯(lián)考期末)已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0的大小順序?yàn)椋?/p>
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.故選:A6.(2023·浙江嘉興·高一校聯(lián)考期中)已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0試比較a,b,c的大小為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】∵SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0.故選:B.7.(2023·天津紅橋·天津三中??家荒#┰O(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則三者的大小順序是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】因?yàn)镾KIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,故選:B.8.(2023·全國·高三校聯(lián)考階段練習(xí))已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.則a,b,c的大小順序?yàn)椋?/p>
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】因?yàn)镾KIPIF1<0,所以SKIPIF1<0,SKIPIF1<0又SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.故選:D9.(2023·浙江嘉興·高一統(tǒng)考期中)SKIPIF1<0這三個(gè)數(shù)的大小順序是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】因?yàn)镾KIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,故選:C.10.(2023·新疆阿勒泰·高三階段練習(xí))a=0.40.6,b=log0.44,c=40.4這三個(gè)數(shù)的大小順序是()A.a(chǎn)>b>c B.c>b>a C.c>a>b D.b>a>c【答案】C【解析】SKIPIF1<0,選C.03含變量問題11.(2023·江蘇鹽城·高一江蘇省響水中學(xué)校考階段練習(xí))已知正數(shù)SKIPIF1<0,滿足SKIPIF1<0,則下列說法不正確的是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】設(shè)SKIPIF1<0,則SKIPIF1<0∴SKIPIF1<0對A:SKIPIF1<0,A正確;對B:由題意可得:SKIPIF1<0,同理可得:SKIPIF1<0∵SKIPIF1<0SKIPIF1<0∴SKIPIF1<0,則SKIPIF1<0,B錯(cuò)誤;對C:∵SKIPIF1<0∴SKIPIF1<0,C正確;對D:SKIPIF1<0∴SKIPIF1<0,D正確;故選:B.12.(2023·廣西·統(tǒng)考模擬預(yù)測)已知正數(shù)SKIPIF1<0滿足SKIPIF1<0且SKIPIF1<0成等比數(shù)列,則SKIPIF1<0的大小關(guān)系為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】令SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0單調(diào)遞增,所以SKIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0,因?yàn)檎龜?shù)SKIPIF1<0成等比數(shù)列,所以SKIPIF1<0即SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0,綜上所述,SKIPIF1<0,故選:D13.(2023·湖南岳陽·高三統(tǒng)考階段練習(xí))已知正數(shù)SKIPIF1<0,滿足SKIPIF1<0,則SKIPIF1<0的大小關(guān)系為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】SKIPIF1<0均為正數(shù),因?yàn)镾KIPIF1<0,所以SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,令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,所以SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,可得SKIPIF1<0,又SKIPIF1<0得SKIPIF1<0,綜上,SKIPIF1<0.故選:D.14.(2023·湖北·高三校聯(lián)考開學(xué)考試)已知SKIPIF1<0均為不等于1的正實(shí)數(shù),且SKIPIF1<0,則SKIPIF1<0的大小關(guān)系是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】SKIPIF1<0且SKIPIF1<0、SKIPIF1<0、SKIPIF1<0均為不等于SKIPIF1<0的正實(shí)數(shù),則SKIPIF1<0與SKIPIF1<0同號,SKIPIF1<0與SKIPIF1<0同號,從而SKIPIF1<0、SKIPIF1<0、SKIPIF1<0同號.①若SKIPIF1<0、SKIPIF1<0、SKIPIF1<0,則SKIPIF1<0、SKIPIF1<0、SKIPIF1<0均為負(fù)數(shù),SKIPIF1<0,可得SKIPIF1<0,SKIPIF1<0,可得SKIPIF1<0,此時(shí)SKIPIF1<0;②若SKIPIF1<0、SKIPIF1<0、SKIPIF1<0,則SKIPIF1<0、SKIPIF1<0、SKIPIF1<0均為正數(shù),SKIPIF1<0,可得SKIPIF1<0,SKIPIF1<0,可得SKIPIF1<0,此時(shí)SKIPIF1<0.綜上所述,SKIPIF1<0.故選:D.15.(2023·全國·高三專題練習(xí))已知實(shí)數(shù)a,b,c滿足SKIPIF1<0,則a,b,c的大小關(guān)系為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】由題意知SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0單調(diào)遞增,因SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)取等號,故SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0,∴SKIPIF1<0,則SKIPIF1<0,即有SKIPIF1<0,故SKIPIF1<0.故選:C.04構(gòu)造函數(shù)16.(2023·福建莆田·高二統(tǒng)考期末)設(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上遞增,在SKIPIF1<0上遞減,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,故選:D17.(2023·江蘇·校聯(lián)考模擬預(yù)測)已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】由SKIPIF1<0.設(shè)SKIPIF1<0,則SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,所以函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,則函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0;設(shè)SKIPIF1<0,則SKIPIF1<0,所以函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,則SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0.故選:B.18.(2023·甘肅張掖·高臺縣第一中學(xué)??寄M預(yù)測)已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】由SKIPIF1<0,得SKIPIF1<0.設(shè)SKIPIF1<0,則SKIPIF1<0,故當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,f(x)單調(diào)遞增;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,f(x)單調(diào)遞減.所以f(x)在SKIPIF1<0處取得極大值,也是最大值,即SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0(當(dāng)且僅當(dāng)SKIPIF1<0時(shí)取等號),所以SKIPIF1<0,即SKIPIF1<0.設(shè)SKIPIF1<0,則當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以g(x)單調(diào)遞增,所以SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0.故選:C.19.(2023·北京·高三??奸_學(xué)考試)已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,比較a,b,c的大?。海ㄓ谩?lt;”連接)【答案】SKIPIF1<0【解析】令SKIPIF1<0,SKIPIF1<0恒成立,當(dāng)且僅當(dāng)SKIPIF1<0取等號,所SKIPIF1<0是增函數(shù),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0,又因?yàn)镾KIPIF1<0,所以SKIPIF1<0,故由SKIPIF1<0的單調(diào)性知,SKIPIF1<0,所以SKIPIF1<0,從而SKIPIF1<0,又易知SKIPIF1<0,又由函數(shù)SKIPIF1<0的單調(diào)性知,SKIPIF1<0,所以SKIPIF1<0.故答案為:SKIPIF1<020.(2023·浙江杭州·高三浙江省杭州第二中學(xué)??茧A段練習(xí))已知SKIPIF1<0,則下列有關(guān)SKIPIF1<0的大小關(guān)系比較正確的是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】因?yàn)镾KIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則函數(shù)SKIPIF1<0單調(diào)遞減,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則函數(shù)SKIPIF1<0單調(diào)遞增,則當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0有極小值,即最小值為SKIPIF1<0,所以SKIPIF1<0時(shí),SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,而SKIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則函數(shù)SKIPIF1<0單調(diào)遞減,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則函數(shù)SKIPIF1<0單調(diào)遞增,所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0有極小值,即最小值為SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0.故選:C21.(2023·江蘇無錫·統(tǒng)考模擬預(yù)測)已知SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0的大小為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】令函數(shù)SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),求導(dǎo)得:SKIPIF1<0,則函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,又SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,顯然SKIPIF1<0,則有SKIPIF1<0,所以SKIPIF1<0.故選:C22.(2023·湖北·鄂南高中校聯(lián)考模擬預(yù)測)下列大小比較中,錯(cuò)誤的是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】對于選項(xiàng)D,構(gòu)造函數(shù)SKIPIF1<0,所以SKIPIF1<0,所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,函數(shù)SKIPIF1<0單調(diào)遞增;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,函數(shù)SKIPIF1<0單調(diào)遞減.所以SKIPIF1<0.(當(dāng)且僅當(dāng)SKIPIF1<0時(shí)取等)則令SKIPIF1<0,則SKIPIF1<0,化簡得SKIPIF1<0,故SKIPIF1<0,故SKIPIF1<0,故SKIPIF1<0,所以選項(xiàng)D錯(cuò)誤;對于選項(xiàng)A,SKIPIF1<0SKIPIF1<0,在SKIPIF1<0中,令SKIPIF1<0,則SKIPIF1<0,化簡得SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0.所以SKIPIF1<0,所以選項(xiàng)A正確;對于選項(xiàng)B,在SKIPIF1<0中,令SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,所以選項(xiàng)B正確;對于選項(xiàng)C,SKIPIF1<0所以SKIPIF1<0,所以選項(xiàng)C正確.故選:D23.(2023·云南大理·高二統(tǒng)考期末)若SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】設(shè)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0在SKIPIF1<0上為增函數(shù),故SKIPIF1<0,即SKIPIF1<0.又SKIPIF1<0在SKIPIF1<0上為增函數(shù),且SKIPIF1<0,則有SKIPIF1<0,即SKIPIF1<0,故SKIPIF1<0.設(shè)SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0為減函數(shù),SKIPIF1<0,即SKIPIF1<0,故SKIPIF1<0,即SKIPIF1<0.綜合可得:SKIPIF1<0.故選:A24.(2023·安徽阜陽·高二統(tǒng)考期末)設(shè)SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】設(shè)SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,在SKIPIF1<0上單調(diào)遞減,所以SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上恒成立,所以SKIPIF1<0.設(shè)SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上恒成立,所以SKIPIF1<0.函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0,即SKIPIF1<0.從而有SKIPIF1<0,故選:C.25.(2023·福建龍巖·高二統(tǒng)考期末)若SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】由SKIPIF1<0,SKIPIF1<0,令SKIPIF1<0且SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0上SKIPIF1<0,此時(shí)SKIPIF1<0單調(diào)遞增,故SKIPIF1<0,所以SKIPIF1<0,令SKIPIF1<0且SKIPIF1<0,則SKIPIF1<0,即此時(shí)SKIPIF1<0單調(diào)遞增,所以SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0得:SKIPIF1<0,故SKIPIF1<0,則SKIPIF1<0,綜上SKIPIF1<0.故選:B26.(2023·海南·高二統(tǒng)考期末)若SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】對于SKIPIF1<0,令SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0在SKIPIF1<0上遞增,故SKIPIF1<0,即SKIPIF1<0在SKIPIF1<0上恒成立,所以SKIPIF1<0;由SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0,且SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0在SKIPIF1<0上遞增,所以SKIPIF1<0,即SKIPIF1<0.綜上,SKIPIF1<0.故選:D27.(2023·重慶沙坪壩·高三重慶一中校考開學(xué)考試)已知實(shí)數(shù)SKIPIF1<0滿足:SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】令SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0在SKIPIF1<0上恒成立,故SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,故SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,令SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0在SKIPIF1<0上恒成立,故SKIPIF1<0,所以SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,由于SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0,取SKIPIF1<0得:SKIPIF1<0.所以SKIPIF1<0.故選:A05數(shù)形結(jié)合28.(2023·河南·校聯(lián)考模擬預(yù)測)已知SKIPIF1<0,則SKIPIF1<0的大小關(guān)系是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】SKIPIF1<0,SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0,下面比較SKIPIF1<0與SKIPIF1<0的大小,構(gòu)造函數(shù)SKIPIF1<0與SKIPIF1<0,由指數(shù)函數(shù)SKIPIF1<0與冪函數(shù)SKIPIF1<0的圖像與單調(diào)性可知,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0由SKIPIF1<0,故SKIPIF1<0,故SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,故選:A29.(2023·全國·高三專題練習(xí))設(shè)SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】構(gòu)造斜率函數(shù)SKIPIF1<0,即SKIPIF1<0上點(diǎn)與SKIPIF1<0所成直線的斜率,由題設(shè),構(gòu)造的斜率都是正數(shù),由圖象知:傾斜角越大,斜率越大,即原式的值越大,可得:SKIPIF1<0,即SKIPIF1<0.故選:B30.(2023·福建龍巖·高三統(tǒng)考期中)以SKIPIF1<0依次表示方程SKIPIF1<0的根,則SKIPIF1<0的大小順序?yàn)锳.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】因方程的解,故在同一平面直角坐標(biāo)系中畫出函數(shù)及函數(shù)的圖象,結(jié)合圖象可以看出SKIPIF1<0,故應(yīng)選答案C.31.(2023·浙江杭州·高一杭十四中??计谀┰O(shè)正實(shí)數(shù)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0分別滿足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】C【解析】由SKIPIF1<0,得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,分別作函數(shù)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0圖像,如圖所示,它們與函數(shù)SKIPIF1<0圖像交點(diǎn)的橫坐標(biāo)分別為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,有圖像可得SKIPIF1<0,故選:C.32.(2023·北京·高一北京市十一學(xué)校??计谀┮阎猄KIPIF1<0,SKIPIF1<0,SKIPIF1<0滿足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】C【解析】在同一平面直角坐標(biāo)系內(nèi)作出SKIPIF1<0的圖像SKIPIF1<0過點(diǎn)SKIPIF1<0;SKIPIF1<0過點(diǎn)SKIPIF1<0;SKIPIF1<0過點(diǎn)SKIPIF1<0;SKIPIF1<0過點(diǎn)SKIPIF1<0,則SKIPIF1<0與SKIPIF1<0圖像交點(diǎn)橫坐標(biāo)依次增大,又SKIPIF1<0與SKIPIF1<0圖像交點(diǎn)橫坐標(biāo)分別為SKIPIF1<0,則SKIPIF1<0.故選:C33.(2023·寧夏銀川·高三??茧A段練習(xí))已知函數(shù)SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,則()A.SKIPIF1<0,SKIPIF1<0,SKIPIF1<0 B.SKIPIF1<0,SKIPIF1<0,SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】令SKIPIF1<0,解得SKIPIF1<0,畫出SKIPIF1<0的圖象如下圖所示,由于SKIPIF1<0,且SKIPIF1<0,由圖可知:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0的值可正可負(fù)也可為SKIPIF1<0,所以AB選項(xiàng)錯(cuò)誤.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,滿足SKIPIF1<0,SKIPIF1<0,所以C選項(xiàng)錯(cuò)誤.SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,D選項(xiàng)正確.故選:D34.(2023·江蘇南通·高三統(tǒng)考期中)已知正實(shí)數(shù)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則a,b,c的大小關(guān)系為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】SKIPIF1<0,故令SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0.易知SKIPIF1<0和SKIPIF1<0均為SKIPIF1<0上的增函數(shù),故SKIPIF1<0在SKIPIF1<0為增函數(shù).∵SKIPIF1<0,故由題可知,SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0.易知SKIPIF1<0,SKIPIF1<0,作出函數(shù)SKIPIF1<0與函數(shù)SKIPIF1<0的圖象,如圖所示,則兩圖象交點(diǎn)橫坐標(biāo)在SKIPIF1<0內(nèi),即SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.故選:B.35.(2023·河南·統(tǒng)考一模)已知SKIPIF1<0,則這三個(gè)數(shù)的大小關(guān)系為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】令SKIPIF1<0,則SKIPIF1<0,由SKIPIF1<0,解得SKIPIF1<0,由SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,在SKIPIF1<0上單調(diào)遞減;因?yàn)镾KIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0遞增,所以SKIPIF1<0,即SKIPIF1<0;SKIPIF1<0,在同一坐標(biāo)系中作出SKIPIF1<0與SKIPIF1<0的圖象,如圖:由圖象可知在SKIPIF1<0中恒有SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,且SKIPIF1<0所以SKIPIF1<0,即SKIPIF1<0;綜上可知:SKIPIF1<0,故選:A06特殊值法、估算法36.若都不為零的實(shí)數(shù)SKIPIF1<0滿足SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】取SKIPIF1<0,滿足SKIPIF1<0,但SKIPIF1<0,A錯(cuò)誤;當(dāng)SKIPIF1<0,滿足SKIPIF1<0,但SKIPIF1<0,B錯(cuò)誤;因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,C正確;當(dāng)SKIPIF1<0或SKIPIF1<0時(shí),SKIPIF1<0無意義,故D錯(cuò)誤.故選:C37.已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0,則a、b、c的大小關(guān)系是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】取SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.故選:B.38.(2023·全國·高三專題練習(xí))已知SKIPIF1<0,則SKIPIF1<0的大小關(guān)系為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】依題意,SKIPIF1<0,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,而SKIPIF1<0,于是得SKIPIF1<0,即SKIPIF1<0,函數(shù)SKIPIF1<0在SKIPIF1<0單調(diào)遞增,并且有SKIPIF1<0,則SKIPIF1<0SKIPIF1<0,于是得SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,又函數(shù)SKIPIF1<0在SKIPIF1<0單調(diào)遞增,且SKIPIF1<0,則有SKIPIF1<0,所以SKIPIF1<0.故選:C39.(2023·全國·高三專題練習(xí))已知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<0C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】由SKIPIF1<0,SKIPIF1<0,可知SKIPIF1<0,又由SKIPIF1<0,從而SKIPIF1<0,可得SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0;因?yàn)镾KIPIF1<0,從而SKIPIF1<0,即SKIPIF1<0,由對數(shù)函數(shù)單調(diào)性可知,SKIPIF1<0,綜上所述,SKIPIF1<0.故選:B.07放縮法、同構(gòu)法40.(2023·全國·高三專題練習(xí))設(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則a、b、c的大小是.【答案】SKIPIF1<0【解析】令函數(shù)SKIPIF1<0即有SKIPIF1<0當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0∴函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,在SKIPIF1<0上單調(diào)遞增故,SKIPIF1<0∴SKIPIF1<0令函數(shù)SKIPIF1<0,即有SKIPIF1<0當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0∴函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,在SKIPIF1<0上單調(diào)遞減故,SKIPIF1<0∴SKIPIF1<0綜上,知:SKIPIF1<0故答案為:SKIPIF1<041.(2023·貴州安順·高二統(tǒng)考期末)已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】顯然SKIPIF1<0,則SKIPIF1<0,因此SKIPIF1<0,令函數(shù)SKIPIF1<0,求導(dǎo)得SKIPIF1<0,函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,即有SKIPIF1<0,于是SKIPIF1<0,有SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0.故選:D42.(2023·貴州畢節(jié)·??寄M預(yù)測)已知實(shí)數(shù)SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】因?yàn)镾KIPIF1<0,則SKIPIF1<0,SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0,又因?yàn)镾KIPIF1<0,所以SKIPIF1<0,可得SKIPIF1<0,所以SKIPIF1<0,對于A,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,由SKIPIF1<0得SKIPIF1<0,所以SKIPIF1<0,可得SKIPIF1<0,故A錯(cuò)誤;
對于B,即證SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,由SKIPIF1<0得SKIPIF1<0,所以SKIPIF1<0,故B錯(cuò)誤;對于C,即證SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,由SKIPIF1<0得SKIPIF1<0,所以SKIPIF1<0,故C錯(cuò)誤;
對于D,SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,由SKIPIF1<0得SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,故D正確.故選:D.43.(2023·遼寧沈陽·高三遼寧實(shí)驗(yàn)中學(xué)??茧A段練習(xí))已知SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】由SKIPIF1<0,SKIPIF
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