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第03講3.2.1單調(diào)性與最大(?。┲嫡n程標(biāo)準(zhǔn)學(xué)習(xí)目標(biāo)①理解單調(diào)函數(shù)的定義,理解增函數(shù)、減函數(shù)、單調(diào)區(qū)間、單調(diào)性的定義.②掌握定義法證明函數(shù)單調(diào)性的步驟.③掌握函數(shù)單調(diào)區(qū)間的寫(xiě)法.④理解函數(shù)的最大(小)值的概念及其幾何意義.⑤.會(huì)借助單調(diào)性求最值.⑥掌握求二次函數(shù)在給定區(qū)間上的最值.通過(guò)本節(jié)課的學(xué)習(xí),要求掌握函數(shù)單調(diào)性的證明,會(huì)求常用函數(shù)的單調(diào)區(qū)間,會(huì)利用函數(shù)的單調(diào)性求函數(shù)的最大與最小值.并能通過(guò)函數(shù)的單調(diào)性求待定參數(shù)的值.知識(shí)點(diǎn)01:函數(shù)的單調(diào)性1、增函數(shù)與減函數(shù)1.1增函數(shù)一般地,設(shè)函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,區(qū)間SKIPIF1<0,如果SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),都有SKIPIF1<0,那么就稱(chēng)函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增.(如圖:圖象從左到右是上升的)特別地,當(dāng)函數(shù)SKIPIF1<0在它的定義域上單調(diào)遞增時(shí),稱(chēng)它是增函數(shù)(increasingfunction).1.2減函數(shù)一般地,設(shè)函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,區(qū)間SKIPIF1<0,如果SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),都有SKIPIF1<0,那么就稱(chēng)函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是單調(diào)遞減.(如圖:圖象從左到右是下降的)特別地,當(dāng)函數(shù)SKIPIF1<0在它的定義域上單調(diào)遞增時(shí),稱(chēng)它是減函數(shù)(decreasingfunction).2、函數(shù)的單調(diào)性與單調(diào)區(qū)間如果函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增或單調(diào)遞減,那么就說(shuō)函數(shù)SKIPIF1<0在這一區(qū)間具有(嚴(yán)格的)單調(diào)性,區(qū)間SKIPIF1<0叫做SKIPIF1<0的單調(diào)區(qū)間.3、常見(jiàn)函數(shù)的單調(diào)性函數(shù)單調(diào)性一次函數(shù)SKIPIF1<0(SKIPIF1<0)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0在SKIPIF1<0上單調(diào)遞增當(dāng)SKIPIF1<0時(shí),SKIPIF1<0在SKIPIF1<0上單調(diào)遞減反比例函數(shù)SKIPIF1<0(SKIPIF1<0)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0在SKIPIF1<0和SKIPIF1<0上單調(diào)遞減當(dāng)SKIPIF1<0時(shí),SKIPIF1<0在SKIPIF1<0和SKIPIF1<0上單調(diào)遞增二次函數(shù)SKIPIF1<0(SKIPIF1<0)對(duì)稱(chēng)軸為SKIPIF1<0當(dāng)SKIPIF1<0時(shí),SKIPIF1<0在SKIPIF1<0上單調(diào)遞減;在SKIPIF1<0上單調(diào)遞增當(dāng)SKIPIF1<0時(shí),SKIPIF1<0在SKIPIF1<0上單調(diào)遞增;在SKIPIF1<0上單調(diào)遞減知識(shí)點(diǎn)02:函數(shù)單調(diào)性的判斷與證明1、定義法:一般用于證明,設(shè)函數(shù)SKIPIF1<0,證明的單調(diào)區(qū)間為SKIPIF1<0①取值:任取SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0;②作差:計(jì)算SKIPIF1<0;③變形:對(duì)SKIPIF1<0進(jìn)行有利于符號(hào)判斷的變形(如通分,因式分解,配方,有理化等);如有必要需討論參數(shù);④定號(hào):通過(guò)變形,判斷SKIPIF1<0或(SKIPIF1<0),如有必要需討論參數(shù);⑤下結(jié)論:指出函數(shù)SKIPIF1<0在給定區(qū)間SKIPIF1<0上的單調(diào)性2、圖象法一般通過(guò)已知條件作出函數(shù)的圖象(或者草圖),利用圖象判斷函數(shù)的單調(diào)性.3、性質(zhì)法(1)函數(shù)SKIPIF1<0在給定區(qū)間SKIPIF1<0上的單調(diào)性與SKIPIF1<0在給定區(qū)間SKIPIF1<0上的單調(diào)性相反;(2)函數(shù)SKIPIF1<0在給定區(qū)間SKIPIF1<0上的單調(diào)性與SKIPIF1<0的單調(diào)性相同;(3)SKIPIF1<0和SKIPIF1<0的公共定義區(qū)間SKIPIF1<0,有如下結(jié)論;SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0增SKIPIF1<0增SKIPIF1<0增SKIPIF1<0不確定增SKIPIF1<0減SKIPIF1<0不確定增SKIPIF1<0減SKIPIF1<0減SKIPIF1<0減SKIPIF1<0不確定減SKIPIF1<0增SKIPIF1<0不確定減SKIPIF1<0【即學(xué)即練1】(2023春·青海西寧·高二??奸_(kāi)學(xué)考試)已知函數(shù)SKIPIF1<0.(1)判斷函數(shù)SKIPIF1<0在SKIPIF1<0上的單調(diào)性,并證明;【答案】(1)函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,理由見(jiàn)詳解【詳解】(1)函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減;理由如下:取SKIPIF1<0,規(guī)定SKIPIF1<0;則SKIPIF1<0SKIPIF1<0SKIPIF1<0因?yàn)镾KIPIF1<0,SKIPIF1<0所以SKIPIF1<0所以SKIPIF1<0所以函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減知識(shí)點(diǎn)03:函數(shù)的最大(小)值1、最大值:對(duì)于函數(shù)SKIPIF1<0,其定義域?yàn)镾KIPIF1<0,如果存在實(shí)數(shù)SKIPIF1<0滿(mǎn)足:①SKIPIF1<0,都有SKIPIF1<0②SKIPIF1<0,使得SKIPIF1<0那么稱(chēng)SKIPIF1<0是函數(shù)SKIPIF1<0的最大值;2、最小值:對(duì)于函數(shù)SKIPIF1<0,其定義域?yàn)镾KIPIF1<0,如果存在實(shí)數(shù)SKIPIF1<0滿(mǎn)足:①SKIPIF1<0,都有SKIPIF1<0②SKIPIF1<0,使得SKIPIF1<0那么稱(chēng)SKIPIF1<0是函數(shù)SKIPIF1<0的最小值;知識(shí)點(diǎn)四:復(fù)合函數(shù)的單調(diào)性(同增異減)一般地,對(duì)于復(fù)合函數(shù)SKIPIF1<0,單調(diào)性如下表示,簡(jiǎn)記為“定義域優(yōu)先,同增異減”,即內(nèi)層函數(shù)與外層函數(shù)單調(diào)性相同時(shí),復(fù)合函數(shù)為增函數(shù);內(nèi)層函數(shù)與外層函數(shù)單調(diào)性不同時(shí),復(fù)合函數(shù)為減函數(shù):SKIPIF1<0:令:SKIPIF1<0和SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0增增增增減減減增減減減增【即學(xué)即練2】(2023·全國(guó)·高三專(zhuān)題練習(xí))當(dāng)SKIPIF1<0時(shí),則函數(shù)SKIPIF1<0的值域?yàn)椋?/p>
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【詳解】令SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),函數(shù)SKIPIF1<0單調(diào)遞減,故SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),即SKIPIF1<0,所以SKIPIF1<0,所以函數(shù)的值域?yàn)椋篠KIPIF1<0.故選:C.題型01定義法判斷或證明函數(shù)單調(diào)性【典例1】(2023·高一課時(shí)練習(xí))下列有關(guān)函數(shù)單調(diào)性的說(shuō)法,不正確的是(
)A.若SKIPIF1<0為增函數(shù),SKIPIF1<0為增函數(shù),則SKIPIF1<0為增函數(shù)B.若SKIPIF1<0為減函數(shù),SKIPIF1<0為減函數(shù),則SKIPIF1<0為減函數(shù)C.若SKIPIF1<0為增函數(shù),SKIPIF1<0為減函數(shù),則SKIPIF1<0為增函數(shù)D.若SKIPIF1<0為減函數(shù),SKIPIF1<0為增函數(shù),則SKIPIF1<0為減函數(shù)【典例2】(2023秋·廣東·高一校聯(lián)考期末)已知函數(shù)SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0.(1)求函數(shù)SKIPIF1<0的解析式;(2)根據(jù)定義證明函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增.【變式1】(2023秋·高一課時(shí)練習(xí))求證:函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是增函數(shù).【變式2】(2023春·新疆烏魯木齊·高一新疆師范大學(xué)附屬中學(xué)??奸_(kāi)學(xué)考試)設(shè)函數(shù)SKIPIF1<0.(1)用定義證明函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是單調(diào)減函數(shù);【變式3】(2023·全國(guó)·高一專(zhuān)題練習(xí))求證:函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是減函數(shù).題型02求函數(shù)單調(diào)區(qū)間【典例1】(2023春·山東濱州·高一校考階段練習(xí))函數(shù)SKIPIF1<0的單調(diào)遞增區(qū)間是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【典例2】(2023秋·山東棗莊·高一棗莊八中??茧A段練習(xí))函數(shù)SKIPIF1<0的減區(qū)間是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0,SKIPIF1<0 D.SKIPIF1<0【變式1】(2023春·內(nèi)蒙古呼倫貝爾·高一??奸_(kāi)學(xué)考試)如圖是函數(shù)SKIPIF1<0的圖象,則函數(shù)SKIPIF1<0的減區(qū)間是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0題型03復(fù)合函數(shù)單調(diào)區(qū)間【典例1】(2023·高一課時(shí)練習(xí))函數(shù)SKIPIF1<0的單調(diào)遞增區(qū)間是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【典例2】(2023·海南??凇そy(tǒng)考模擬預(yù)測(cè))函數(shù)SKIPIF1<0的單調(diào)遞減區(qū)間是(
)A.SKIPIF1<0 B.SKIPIF1<0和SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0和SKIPIF1<0【變式1】(2023·全國(guó)·高三專(zhuān)題練習(xí))函數(shù)SKIPIF1<0的單調(diào)遞減區(qū)間是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0題型04根據(jù)函數(shù)的單調(diào)性求參數(shù)【典例1】(2023秋·四川達(dá)州·高一??茧A段練習(xí))若函數(shù)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______【典例2】(2023·全國(guó)·高一專(zhuān)題練習(xí))已知函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是減函數(shù),則整數(shù)SKIPIF1<0的取值可以為()A.SKIPIF1<0 B.SKIPIF1<0 C.0 D.1【變式1】(2023春·青海西寧·高二校考開(kāi)學(xué)考試)已知SKIPIF1<0在SKIPIF1<0上是增函數(shù),則SKIPIF1<0的取值范圍是________.【變式2】(2023·全國(guó)·高一專(zhuān)題練習(xí))“SKIPIF1<0”是“函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上為減函數(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題型05根據(jù)函數(shù)的單調(diào)性解不等式【典例1】(2023秋·高一課時(shí)練習(xí))已知函數(shù)SKIPIF1<0是定義在SKIPIF1<0上的增函數(shù),且SKIPIF1<0,則SKIPIF1<0的取值范圍是(
)A.SKIPIF1<0 B.(2,3)C.(1,2) D.(1,3)【典例2】(2023春·廣東深圳·高二深圳市高級(jí)中學(xué)??奸_(kāi)學(xué)考試)已知函數(shù)SKIPIF1<0在定義域SKIPIF1<0上是減函數(shù),且SKIPIF1<0,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【典例3】(2023秋·云南保山·高一統(tǒng)考期末)已知定義在SKIPIF1<0上的函數(shù)SKIPIF1<0,滿(mǎn)足SKIPIF1<0,且當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.(1)討論函數(shù)SKIPIF1<0的單調(diào)性,并說(shuō)明理由;(2)若SKIPIF1<0,解不等式SKIPIF1<0.【變式1】(2023·全國(guó)·高三專(zhuān)題練習(xí))若函數(shù)y=f(x)在R上單調(diào)遞減,且f(2m-3)>f(-m),則實(shí)數(shù)m的取值范圍是(
)A.(-∞,-1) B.(-1,+∞) C.(1,+∞) D.(-∞,1)【變式2】(2023·山東棗莊·統(tǒng)考模擬預(yù)測(cè))已知函數(shù)SKIPIF1<0是定義在SKIPIF1<0上的減函數(shù),且SKIPIF1<0,則SKIPIF1<0的取值范圍是______.題型06根據(jù)單調(diào)性(圖象)求最值或值域【典例1】(多選)(2023秋·云南怒江·高一??计谀┮阎瘮?shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,其圖象如圖所示,則下列說(shuō)法中正確的是()A.SKIPIF1<0的單調(diào)遞減區(qū)間為SKIPIF1<0B.SKIPIF1<0的最大值為SKIPIF1<0C.SKIPIF1<0的最小值為SKIPIF1<0D.SKIPIF1<0的單調(diào)遞增區(qū)間為SKIPIF1<0【典例2】(2023春·重慶·高二統(tǒng)考階段練習(xí))函數(shù)SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù),且SKIPIF1<0.(1)求實(shí)數(shù)a,b,并確定函數(shù)SKIPIF1<0的解析式;(2)判斷SKIPIF1<0在(-1,1)上的單調(diào)性,并用定義證明你的結(jié)論;(3)寫(xiě)出SKIPIF1<0的單調(diào)減區(qū)間,并判斷SKIPIF1<0有無(wú)最大值或最小值?如有,寫(xiě)出最大值或最小值.(本小問(wèn)不需要說(shuō)明理由)【變式1】(2023·全國(guó)·高一專(zhuān)題練習(xí))設(shè)SKIPIF1<0對(duì)任意的SKIPIF1<0有SKIPIF1<0,且當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.(1)求證SKIPIF1<0是SKIPIF1<0上的減函數(shù);(2)若SKIPIF1<0,求SKIPIF1<0在SKIPIF1<0上的最大值與最小值.【變式2】(2023秋·高一單元測(cè)試)已知函數(shù)SKIPIF1<0是SKIPIF1<0上的偶函數(shù)(1)求實(shí)數(shù)SKIPIF1<0的值,判斷函數(shù)SKIPIF1<0在SKIPIF1<0,SKIPIF1<0上的單調(diào)性;(2)求函數(shù)SKIPIF1<0在SKIPIF1<0,SKIPIF1<0上的最大值和最小值.題型07根據(jù)函數(shù)的最值(值域)求參數(shù)【典例1】(2023·全國(guó)·高一專(zhuān)題練習(xí))函數(shù)SKIPIF1<0在SKIPIF1<0時(shí)有最大值為SKIPIF1<0,則SKIPIF1<0的值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【典例2】(2023·全國(guó)·高三專(zhuān)題練習(xí))若函數(shù)SKIPIF1<0,它的最大值為SKIPIF1<0,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【典例3】(2023秋·廣東茂名·高三統(tǒng)考階段練習(xí))設(shè)函數(shù)SKIPIF1<0若SKIPIF1<0存在最小值,則SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【典例4】(2023·全國(guó)·高一專(zhuān)題練習(xí))已知SKIPIF1<0(1)根據(jù)單調(diào)性的定義證明函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是減函數(shù)(2)若函數(shù)SKIPIF1<0(SKIPIF1<0)的最大值與最小值之差為1,求實(shí)數(shù)SKIPIF1<0的值【變式1】(2023·上海·高三專(zhuān)題練習(xí))設(shè)SKIPIF1<0若SKIPIF1<0是SKIPIF1<0的最小值,則SKIPIF1<0的取值范圍是.【變式1】(2023秋·江西宜春·高一??计谀┮阎瘮?shù)SKIPIF1<0.(1)若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞增,求實(shí)數(shù)SKIPIF1<0的取值范圍;(2)若SKIPIF1<0在區(qū)間SKIPIF1<0上有最大值3,求實(shí)數(shù)SKIPIF1<0的值.題型08二次函數(shù)最值問(wèn)題(含參)【典例1】(2023·高一課時(shí)練習(xí))已知函數(shù)SKIPIF1<0的表達(dá)式SKIPIF1<0,若SKIPIF1<0,求函數(shù)SKIPIF1<0的最值.【典例2】(2023·全國(guó)·高三專(zhuān)題練習(xí))已知二次函數(shù)SKIPIF1<0滿(mǎn)足SKIPIF1<0,且SKIPIF1<0.(1)求SKIPIF1<0的解析式;(2)求函數(shù)在區(qū)間SKIPIF1<0,SKIPIF1<0上的最大值SKIPIF1<0.【變式1】(2022秋·寧夏銀川·高一??茧A段練習(xí))已知函數(shù)SKIPIF1<0(SKIPIF1<0)的最小值為–1.(1)求實(shí)數(shù)a的值;(2)當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),求函數(shù)SKIPIF1<0的最小值.【變式2】(2022秋·陜西西安·高一??茧A段練習(xí))已知函數(shù)SKIPIF1<0,求函數(shù)在區(qū)間SKIPIF1<0上的最小值SKIPIF1<0【變式3】(2022秋·廣東深圳·高一深圳市高級(jí)中學(xué)校考期中)已知函數(shù)SKIPIF1<0.(1)若函數(shù)SKIPIF1<0在SKIPIF1<0上是增函數(shù),求實(shí)數(shù)a的取值范圍;(2)若SKIPIF1<0,求SKIPIF1<0時(shí)SKIPIF1<0的最小值SKIPIF1<0.題型09函數(shù)不等式恒成立問(wèn)題【典例1】(2023秋·廣東肇慶·高一廣東肇慶中學(xué)校考期中)已知SKIPIF1<0.(1)若不等式SKIPIF1<0對(duì)一切實(shí)數(shù)SKIPIF1<0恒成立,求實(shí)數(shù)SKIPIF1<0的取值范圍;(2)若SKIPIF1<0,解不等式SKIPIF1<0.【典例2】(2023·江蘇·高一專(zhuān)題練習(xí))已知函數(shù)SKIPIF1<0,(1)判斷函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上的單調(diào)性,并利用定義證明;(2)若對(duì)任意的SKIPIF1<0時(shí),SKIPIF1<0恒成立,求實(shí)數(shù)SKIPIF1<0的取值范圍.【變式1】(2023·高一課時(shí)練習(xí))已知函數(shù)SKIPIF1<0.(1)若對(duì)任意的SKIPIF1<0,SKIPIF1<0恒成立,求實(shí)數(shù)SKIPIF1<0的取值范圍;(2)若對(duì)任意的SKIPIF1<0,SKIPIF1<0恒成立,求SKIPIF1<0的取值范圍.題型10函數(shù)不等式有解問(wèn)題【典例1】(2023·高一課時(shí)練習(xí))已知函數(shù)SKIPIF1<0(1)解關(guān)于SKIPIF1<0的不等式SKIPIF1<0;(2)已知SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),若對(duì)任意的SKIPIF1<0,總存在SKIPIF1<0,使SKIPIF1<0成立,求實(shí)數(shù)SKIPIF1<0的取值范圍.【典例2】(2023·全國(guó)·高三專(zhuān)題練習(xí))已知函數(shù)SKIPIF1<0在SKIPIF1<0上的最大值為3,最小值為SKIPIF1<0.(1)求SKIPIF1<0的解析式;(2)若SKIPIF1<0,使得SKIPIF1<0,求實(shí)數(shù)SKIPIF1<0的取值范圍.【變式1】(2023·高一單元測(cè)試)若存在實(shí)數(shù)SKIPIF1<0,使得不等式SKIPIF1<0成立,求x的取值范圍.【變式2】(2023·高一課時(shí)練習(xí))已知SKIPIF1<0,其中SKIPIF1<0為常數(shù).(1)若SKIPIF1<0的解集為SKIPIF1<0或SKIPIF1<0,求SKIPIF1<0的值;(2)SKIPIF1<0使SKIPIF1<0,求實(shí)數(shù)SKIPIF1<0的取值范圍.題型11重點(diǎn)方法(分類(lèi)討論)【典例1】(2023·高一課時(shí)練習(xí))定義一種運(yùn)算SKIPIF1<0,設(shè)SKIPIF1<0(t為常數(shù)),且SKIPIF1<0,則使函數(shù)SKIPIF1<0最大值為4的SKIPIF1<0值是__________.【典例2】(2023·全國(guó)·高三對(duì)口高考)設(shè)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,對(duì)于任意實(shí)數(shù)SKIPIF1<0,則SKIPIF1<0的最小值SKIPIF1<0__________.題型12數(shù)學(xué)思想方法(數(shù)形結(jié)合)【典例1】(2023·全國(guó)·高一專(zhuān)題練習(xí))已知函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,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【典例2】(2023·全國(guó)·高三對(duì)口高考)已知函數(shù)SKIPIF1<0,若存在SKIPIF1<0,使得SKIPIF1<0成立,則實(shí)數(shù)SKIPIF1<0的取值范圍是(
)A.SKIPIF1<0或SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<03.2.1單調(diào)性與最大(?。┲礎(chǔ)夯實(shí)基礎(chǔ)B能力提升C綜合素養(yǎng)A夯實(shí)基礎(chǔ)一、單選題1.(2023·廣東·高三統(tǒng)考學(xué)業(yè)考試)在區(qū)間(0,+∞)上不是增函數(shù)的函數(shù)是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<02.(2023秋·江蘇揚(yáng)州·高一期末)SKIPIF1<0的圖象大致是(
)A.B.C.D.3.(2023秋·高一課時(shí)練習(xí))已知函數(shù)SKIPIF1<0在SKIPIF1<0上是增函數(shù),則實(shí)數(shù)SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<04.(2023·江蘇·高一專(zhuān)題練習(xí))關(guān)于SKIPIF1<0的不等式SKIPIF1<0的解集為SKIPIF1<0,且不等式SKIPIF1<0恒成立,則實(shí)數(shù)t的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<05.(2023·湖北黃岡·浠水縣第一中學(xué)??寄M預(yù)測(cè))已知函數(shù)SKIPIF1<0若SKIPIF1<0,則SKIPIF1<0的單調(diào)遞增區(qū)間為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<06.(2023·全國(guó)·高三專(zhuān)題練習(xí))已知函數(shù)SKIPIF1<0的值域?yàn)镾KIPIF1<0,則a的最小值為(
)A.1 B.2 C.3 D.47.(2023秋·高一課時(shí)練習(xí))已知函數(shù)SKIPIF1<0,對(duì)于任意的SKIPIF1<0恒成立,則實(shí)數(shù)SKIPIF1<0的最小值是(
)A.0 B.1 C.2 D.38.(2023春·廣東河源·高一龍川縣第一中學(xué)??计谥校┰O(shè)函數(shù)SKIPIF1<0,若函數(shù)SKIPIF1<0在SKIPIF1<0上是減函數(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<0二、多選題9.(2023春·甘肅武威·高一統(tǒng)考開(kāi)學(xué)考試)下列函數(shù)中,在SKIPIF1<0上單調(diào)遞增的是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<010.(2023秋·高一課時(shí)練習(xí))下列函數(shù)中滿(mǎn)足“對(duì)任意SKIPIF1<0,SKIPIF1<0∈(0,+∞),都有SKIPIF1<0>0”的是(
)A.SKIPIF1<0=-SKIPIF1<0 B.SKIPIF1<0=-3SKIPIF1<0+1C.SKIPIF1<0=SKIPIF1<0+4SKIPIF1<0+3 D.SKIPIF1<0=SKIPIF1<0-SKIPIF1<0三、填空題11.(2023·高一課時(shí)練習(xí))已知函數(shù)SKIPIF1<0是SKIPIF1<0上的嚴(yán)格減函數(shù),則SKIPIF1<0的取值范圍是______.12.(2023春·寧夏吳忠·高二青銅峽市高級(jí)中學(xué)??计谥校┖瘮?shù)SKIPIF1<0的單調(diào)減區(qū)間為_(kāi)_________.四、解答題13.(2023·高一課時(shí)練習(xí))已知SKIPIF1<0在SKIPIF1<0上的圖像如圖所示.(1)指出SKIPIF1<0的單調(diào)區(qū)間.(2)分別指出SKIPIF1<0在區(qū)間SKIPIF1<0及SKIPIF1<0上的最大、最小值.14.(2023·高一課時(shí)練習(xí))己知函數(shù)SKIPIF1<0為定義在SKIPIF1<0上的減函數(shù),且SKIPIF1<0,試求實(shí)數(shù)m的取值范圍.15.(2023·全國(guó)·高三專(zhuān)題練習(xí))利用定義證明函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上為減函數(shù).B能力提升1.(2023·全國(guó)·高三對(duì)口高考)對(duì)于任意SKIPIF1<0,函數(shù)SKIPIF1<0的值恒大于零,則x的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0或SKIPIF1<0 D.SKIPIF1<02.(2023·全國(guó)·高三專(zhuān)題練習(xí))已知函數(shù)SKIPIF1<0,滿(mǎn)足對(duì)任意的實(shí)數(shù)SKIPIF1<0,SKIPIF1<0且SKIPIF1<0,都有SKIPIF1<0,則實(shí)數(shù)a的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<03.(2023·北京·高三專(zhuān)題練習(xí))已知函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,存在常數(shù)SKIPIF1<0,使得對(duì)任意SKIPIF1<0,都有SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.若SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,則t的最小值為(
)A.3 B.SKIPIF1<0 C.2 D.SKIPIF1<04.(2023春·天津河?xùn)|·高二天津市第七中學(xué)校考階段練習(xí))若函數(shù)SKIPIF1<0是定義在SKIPIF1<0上的增函數(shù),且對(duì)一切SKIPIF1<0,SKIPIF1<0,滿(mǎn)足SKIPIF1<0,則不等式SKIPIF1<0的解為_(kāi)_____.5.(2023·
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