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試卷第=page11頁,共=sectionpages33頁試卷第=page11頁,共=sectionpages33頁第7課函數(shù)的單調(diào)性與最值學(xué)校:___________姓名:___________班級(jí):___________考號(hào):___________【基礎(chǔ)鞏固】1.(2022·全國(guó)·高三專題練習(xí))函數(shù)SKIPIF1<0單調(diào)遞減區(qū)間是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】C【解析】令SKIPIF1<0,SKIPIF1<0.由SKIPIF1<0,得SKIPIF1<0.因?yàn)楹瘮?shù)SKIPIF1<0是關(guān)于SKIPIF1<0的遞減函數(shù),且SKIPIF1<0時(shí),SKIPIF1<0為增函數(shù),所以SKIPIF1<0為減函數(shù),所以函數(shù)SKIPIF1<0的單調(diào)減區(qū)間是SKIPIF1<0.故選:C.2.(2021·山東臨沂·高三階段練習(xí))“SKIPIF1<0”是“函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上為增函數(shù)”的(
)A.充分不必要條件 B.必要不充分條件C.充要條件 D.既不充分也不必要條件【答案】A【解析】SKIPIF1<0的圖象如圖所示,要想函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上為增函數(shù),必須滿足SKIPIF1<0,因?yàn)镾KIPIF1<0是SKIPIF1<0的子集,所以“SKIPIF1<0”是“函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上為增函數(shù)”的充分不必要條件.故選:A3.(2022·湖北·二模)已知函數(shù)SKIPIF1<0,則使不等式SKIPIF1<0成立的x的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】由SKIPIF1<0得SKIPIF1<0定義域?yàn)镾KIPIF1<0,SKIPIF1<0,故SKIPIF1<0為偶函數(shù),而SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,故SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則SKIPIF1<0可化為SKIPIF1<0,得SKIPIF1<0解得SKIPIF1<0故選:D4.(2022·湖南·長(zhǎng)沙市明德中學(xué)二模)定義在SKIPIF1<0上的偶函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,且SKIPIF1<0,若不等式SKIPIF1<0的解集為SKIPIF1<0,則SKIPIF1<0的值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】因?yàn)镾KIPIF1<0為偶函數(shù),SKIPIF1<0,SKIPIF1<0在SKIPIF1<0單調(diào)遞減,若SKIPIF1<0,則SKIPIF1<0,不等式SKIPIF1<0可轉(zhuǎn)化為SKIPIF1<0,所以SKIPIF1<0,解得:SKIPIF1<0,所以SKIPIF1<0且SKIPIF1<0,即SKIPIF1<0.故選:B.5.(2022·河北·石家莊二中模擬預(yù)測(cè))設(shè)SKIPIF1<0,函數(shù)SKIPIF1<0,若SKIPIF1<0的最小值為SKIPIF1<0,則實(shí)數(shù)SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí),等號(hào)成立;即當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0的最小值為SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,要使得函數(shù)SKIPIF1<0的最小值為SKIPIF1<0,則滿足SKIPIF1<0,解得SKIPIF1<0,即實(shí)數(shù)SKIPIF1<0的取值范圍是SKIPIF1<0.故選:A.6.(2022·山東濟(jì)寧·三模)若函數(shù)SKIPIF1<0為偶函數(shù),對(duì)任意的SKIPIF1<0,且SKIPIF1<0,都有SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】A【解析】解:由對(duì)SKIPIF1<0,且SKIPIF1<0,都有SKIPIF1<0,所以函數(shù)SKIPIF1<0在SKIPIF1<0上遞減,又函數(shù)SKIPIF1<0為偶函數(shù),所以函數(shù)SKIPIF1<0關(guān)于SKIPIF1<0對(duì)稱,所以SKIPIF1<0,又SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0.故選:A.7.(2022·全國(guó)·高三專題練習(xí))已知函數(shù)SKIPIF1<0,記SKIPIF1<0,若SKIPIF1<0在區(qū)間SKIPIF1<0上是增函數(shù),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【解析】SKIPIF1<0則SKIPIF1<0令SKIPIF1<0,由SKIPIF1<0,所以SKIPIF1<0令SKIPIF1<0因?yàn)镾KIPIF1<0在區(qū)間SKIPIF1<0上是增函數(shù),所以SKIPIF1<0在SKIPIF1<0也是增函數(shù)所以SKIPIF1<0,則SKIPIF1<0即SKIPIF1<0故選:B8.(2022·浙江·高三專題練習(xí))已知函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上遞減,且當(dāng)SKIPIF1<0時(shí),有SKIPIF1<0,則實(shí)數(shù)t的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】解:函數(shù)SKIPIF1<0的對(duì)稱軸為直線SKIPIF1<0,因?yàn)楹瘮?shù)SKIPIF1<0在區(qū)間SKIPIF1<0上遞減,所以SKIPIF1<0.所以SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.因?yàn)镾KIPIF1<0,所以SKIPIF1<0.故選:B9.(多選)(2022·重慶八中高三階段練習(xí))函數(shù)SKIPIF1<0均是定義在R上的單調(diào)遞增函數(shù),且SKIPIF1<0,則下列各函數(shù)一定在R上單調(diào)遞增的是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】BC【解析】取SKIPIF1<0,故SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,在SKIPIF1<0上,SKIPIF1<0,故SKIPIF1<0在SKIPIF1<0上為減函數(shù),故A錯(cuò)誤.而SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,在SKIPIF1<0上,SKIPIF1<0,故SKIPIF1<0在SKIPIF1<0上為減函數(shù),故D錯(cuò)誤.設(shè)SKIPIF1<0,SKIPIF1<0,任意SKIPIF1<0,則SKIPIF1<0,因?yàn)镾KIPIF1<0均是定義在R上的單調(diào)遞增函數(shù),故SKIPIF1<0,所以SKIPIF1<0即SKIPIF1<0,故SKIPIF1<0是R上的單調(diào)遞增函數(shù).而SKIPIF1<0因?yàn)镾KIPIF1<0是定義在R上的單調(diào)遞增函數(shù),故SKIPIF1<0,且SKIPIF1<0,所以SKIPIF1<0即SKIPIF1<0,故SKIPIF1<0是R上的單調(diào)遞增函數(shù).故BC正確.故選:BC10.(多選)(2022·山東·青島二中高三期末)記SKIPIF1<0的導(dǎo)函數(shù)為SKIPIF1<0,若SKIPIF1<0對(duì)任意的正數(shù)都成立,則下列不等式中成立的有(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】BC【解析】解:因?yàn)镾KIPIF1<0,所以SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0單調(diào)遞增,所以SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,故A錯(cuò)誤;同理SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,故B正確;因?yàn)镾KIPIF1<0,所以SKIPIF1<0,構(gòu)造函數(shù)SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0單調(diào)遞減,所以SKIPIF1<0,即SKIPIF1<0SKIPIF1<0,化簡(jiǎn)得SKIPIF1<0,故C正確;同理SKIPIF1<0,即SKIPIF1<0SKIPIF1<0,化簡(jiǎn)得SKIPIF1<0,故D錯(cuò)誤.故選:BC.11.(2022·江蘇省平潮高級(jí)中學(xué)高三開學(xué)考試)函數(shù)y=-x2+2|x|+3的單調(diào)減區(qū)間是________.【答案】SKIPIF1<0和SKIPIF1<0.【解析】根據(jù)題意,SKIPIF1<0,故當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0在區(qū)間(0,1)上單調(diào)遞增,在SKIPIF1<0上單調(diào)遞減;當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增,在(-1,0)上單調(diào)遞減.故答案為:SKIPIF1<0和(-1,0).12.(2022·浙江省普陀中學(xué)高三階段練習(xí))已知奇函數(shù)SKIPIF1<0是定義在[-1,1]上的增函數(shù),且SKIPIF1<0,則SKIPIF1<0的取值范圍為___________.【答案】SKIPIF1<0【解析】因?yàn)槠婧瘮?shù)SKIPIF1<0在[-1,1]上是增函數(shù),所以有SKIPIF1<0,SKIPIF1<0可化為SKIPIF1<0,要使該不等式成立,有SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0的取值范圍為SKIPIF1<0.故答案為:SKIPIF1<0.13.(2022·湖北·房縣第一中學(xué)模擬預(yù)測(cè))已知函數(shù)SKIPIF1<0在SKIPIF1<0上的最小值為1,則SKIPIF1<0的值為________.【答案】1【解析】由題意得SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,∴SKIPIF1<0的最小值為SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0不成立;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0在SKIPIF1<0單調(diào)遞減,在SKIPIF1<0上單調(diào)遞增,∴SKIPIF1<0的最小值為SKIPIF1<0,符合題意.故SKIPIF1<0.故答案為:1.14.(2022·廣東·模擬預(yù)測(cè))已知SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0之間的大小關(guān)系是__________.(用“SKIPIF1<0”連接)【答案】SKIPIF1<0【解析】解:函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,因?yàn)镾KIPIF1<0,所以函數(shù)SKIPIF1<0為偶函數(shù),因?yàn)楹瘮?shù)SKIPIF1<0在SKIPIF1<0上遞增,所以函數(shù)SKIPIF1<0在SKIPIF1<0上遞增,則SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0.故答案為:SKIPIF1<0.15.(2022·全國(guó)·高三專題練習(xí))已知函數(shù)SKIPIF1<0是定義在SKIPIF1<0上的函數(shù),SKIPIF1<0恒成立,且SKIPIF1<0(1)確定函數(shù)SKIPIF1<0的解析式;(2)用定義證明SKIPIF1<0在SKIPIF1<0上是增函數(shù);(3)解不等式SKIPIF1<0.【解】(1)解:因?yàn)楹瘮?shù)SKIPIF1<0,SKIPIF1<0恒成立,所以SKIPIF1<0,則SKIPIF1<0,此時(shí)SKIPIF1<0,所以SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0;(2)證明:設(shè)SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,所以函數(shù)SKIPIF1<0是增函數(shù).(3)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是定義在SKIPIF1<0上的增函數(shù),SKIPIF1<0SKIPIF1<0,得SKIPIF1<0,所以不等式的解集為SKIPIF1<0.16.(2022·全國(guó)·高三專題練習(xí))設(shè)函數(shù)SKIPIF1<0(SKIPIF1<0),滿足SKIPIF1<0,且對(duì)任意實(shí)數(shù)x均有SKIPIF1<0.(1)求SKIPIF1<0的解析式;(2)當(dāng)SKIPIF1<0時(shí),若SKIPIF1<0是單調(diào)函數(shù),求實(shí)數(shù)k的取值范圍.【解】(1)∵SKIPIF1<0,∴SKIPIF1<0.即SKIPIF1<0,因?yàn)槿我鈱?shí)數(shù)x,SKIPIF1<0恒成立,則SKIPIF1<0且SKIPIF1<0,∴SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.(2)因?yàn)镾KIPIF1<0,設(shè)SKIPIF1<0,要使SKIPIF1<0在SKIPIF1<0上單調(diào),只需要SKIPIF1<0或SKIPIF1<0或SKIPIF1<0或SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,所以實(shí)數(shù)k的取值范圍SKIPIF1<0.17.(2022·全國(guó)·高三專題練習(xí))已知函數(shù)SKIPIF1<0.(1)若SKIPIF1<0在區(qū)間SKIPIF1<0上不單調(diào),求SKIPIF1<0的取值范圍;(2)求函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上的最大值;(3)若對(duì)于任意的SKIPIF1<0,存在SKIPIF1<0,使得SKIPIF1<0,求SKIPIF1<0的取值范圍.【解】(1)解:函數(shù)SKIPIF1<0的對(duì)稱軸為SKIPIF1<0,因?yàn)橐阎猄KIPIF1<0在區(qū)間SKIPIF1<0,SKIPIF1<0上不單調(diào),則SKIPIF1<0,解得SKIPIF1<0,故SKIPIF1<0的范圍為SKIPIF1<0;(2)SKIPIF1<0,SKIPIF1<0(1)SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),即SKIPIF1<0時(shí),最大值為SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),即SKIPIF1<0時(shí),最大值為SKIPIF1<0(1)SKIPIF1<0,SKIPIF1<0(3)解法一SKIPIF1<0當(dāng)SKIPIF1<0時(shí),即SKIPIF1<0時(shí),SKIPIF1<0(2),SKIPIF1<0(2)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0所以SKIPIF1<0;SKIPIF1<0當(dāng)SKIPIF1<0時(shí),即SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,綜上,SKIPIF1<0,故SKIPIF1<0,所以SKIPIF1<0,解法二:SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)等號(hào)成立,又SKIPIF1<0,SKIPIF1<0.【素養(yǎng)提升】1.(2022·江蘇南通·高三期末)已知函數(shù)SKIPIF1<0,則不等式f(x)+f(2x-1)>0的解集是(
)A.(1,+∞) B.SKIPIF1<0 C.SKIPIF1<0 D.(-∞,1)【答案】B【解析】SKIPIF1<0的定義域滿足SKIPIF1<0,由SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上恒成立.所以SKIPIF1<0的定義域?yàn)镾KIPIF1<0SKIPIF1<0則SKIPIF1<0SKIPIF1<0所以SKIPIF1<0,即SKIPIF1<0為奇函數(shù).設(shè)SKIPIF1<0,由上可知SKIPIF1<0為奇函數(shù).當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0均為增函數(shù),則SKIPIF1<0在SKIPIF1<0上為增函數(shù).所以SKIPIF1<0在SKIPIF1<0上為增函數(shù).又SKIPIF1<0為奇函數(shù),則SKIPIF1<0在SKIPIF1<0上為增函數(shù),且SKIPIF1<0所以SKIPIF1<0在SKIPIF1<0上為增函數(shù).又SKIPIF1<0在SKIPIF1<0上為增函數(shù),SKIPIF1<0在SKIPIF1<0上為減函數(shù)所以SKIPIF1<0在SKIPIF1<0上為增函數(shù),故SKIPIF1<0在SKIPIF1<0上為增函數(shù)由不等式SKIPIF1<0,即SKIPIF1<0所以SKIPIF1<0,則SKIPIF1<0故選:B2.(2022·福建省廈門集美中學(xué)模擬預(yù)測(cè))已知函數(shù)SKIPIF1<0是定義域?yàn)镽的函數(shù),SKIPIF1<0,對(duì)任意SKIPIF1<0,SKIPIF1<0SKIPIF1<0,均有SKIPIF1<0,已知a,bSKIPIF1<0為關(guān)于x的方程SKIPIF1<0的兩個(gè)解,則關(guān)于t的不等式SKIPIF1<0的解集為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】由SKIPIF1<0,得SKIPIF1<0且函數(shù)SKIPIF1<0關(guān)于點(diǎn)SKIPIF1<0對(duì)稱.由對(duì)任意SKIPIF1<0,SKIPIF1<0SKIPIF1<0,均有SKIPIF1<0,可知函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增.又因?yàn)楹瘮?shù)SKIPIF1<0的定義域?yàn)镽,所以函數(shù)SKIPIF1<0在R上單調(diào)遞增.因?yàn)閍,bSKIPIF1<0為關(guān)于x的方程SKIPIF1<0的兩個(gè)解,所以SKIPIF1<0,解得SKIPIF1<0,且SKIPIF1<0,即SKIPIF1<0.又SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,則由SKIPIF1<0,得SKIPIF1<0,所以SKIPIF1<0.綜上,t的取值范圍是SKIPIF1<0.故選:D.3.(2022·湖南·邵陽市第二中學(xué)模擬預(yù)測(cè))已知函數(shù)SKIPIF1<0,若不等式SKIPIF1<0對(duì)SKIPIF1<0恒成立,則實(shí)數(shù)SKIPIF1<0的取值范圍______.【答案】SKIPIF1<0【解析】SKIPIF1<0,因?yàn)镾KIPIF1<0在SKIPIF1<0上為增函數(shù),所以SKIPIF1<0在SKIPIF1<0上為增函數(shù),因?yàn)镾KIPIF1<0,所以SKIPIF1<0可化為SKIPIF1<0,因?yàn)镾KIPIF1<0在SKIPIF1<0上為增函數(shù),所以SKIPIF1<0對(duì)SKIPIF1<0恒成立,所以SKIPIF1<0對(duì)SKIP
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