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專題2-7導數(shù)大題求參歸類目錄TOC\o"1-1"\h\u題型01恒成立求參:常規(guī)型 1題型02恒成立求參:三角函數(shù)型 2題型03恒成立求參:雙變量型 2題型04恒成立求參:整數(shù)型 3題型05恒成立求參:三角函數(shù)型整數(shù) 4/題型06“能”成立求參:常規(guī)型 5題型07“能”成立求參:雙變量型 5題型08“能”成立求參:正余弦型 6題型09零點型求參:常規(guī)型 7題型10零點型求參:雙零點型 8題型11零點型求參:多零點綜合型 8題型12同構(gòu)型求參:x1,x2雙變量同構(gòu) 9題型13虛設(shè)零點型求參 10高考練場 10題型01恒成立求參:常規(guī)型【解題攻略】利用導數(shù)求解參數(shù)范圍的兩種常用方法:(1)分離參數(shù)法:將參數(shù)和自變量分離開來,構(gòu)造關(guān)于自變量的新函數(shù),研究新函數(shù)最值與參數(shù)之間的關(guān)系,求解出參數(shù)范圍;(2)分類討論法:根據(jù)題意分析參數(shù)的臨界值,根據(jù)臨界值作分類討論,分別求解出滿足題意的參數(shù)范圍最后取并集.【典例1-1】(2024上·北京·高三階段練習)設(shè)SKIPIF1<0,函數(shù)SKIPIF1<0.(1)討論SKIPIF1<0的單調(diào)性;(2)若SKIPIF1<0,求a的取值范圍;(3)若SKIPIF1<0,求a.【典例1-2】(2024上·甘肅武威·高三統(tǒng)考期末)已知函數(shù)SKIPIF1<0.(1)當SKIPIF1<0時,求SKIPIF1<0的最大值;(2)若SKIPIF1<0在SKIPIF1<0上恒成立,求實數(shù)SKIPIF1<0的取值范圍.【變式1-1】(2023上·江蘇鎮(zhèn)江·高三??茧A段練習)已知函數(shù)SKIPIF1<0.(1)若SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,求實數(shù)a的取值范圍;(2)若SKIPIF1<0對SKIPIF1<0恒成立,求實數(shù)a的取值范圍.【變式1-2】(2024上·山西·高三期末)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)求證:函數(shù)SKIPIF1<0存在單調(diào)遞減區(qū)間,并求出該函數(shù)單調(diào)遞減區(qū)間SKIPIF1<0的長度SKIPIF1<0的取值范圍;(2)當SKIPIF1<0時,SKIPIF1<0恒成立,求實數(shù)SKIPIF1<0的取值范圍.【變式1-3】(2024·全國·模擬預測)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)求函數(shù)SKIPIF1<0的單調(diào)區(qū)間;(2)若對任意的SKIPIF1<0,不等式SKIPIF1<0恒成立,求實數(shù)SKIPIF1<0的取值范圍.題型02恒成立求參:三角函數(shù)型【解題攻略】三角函數(shù)與導數(shù)應(yīng)用求參:正余弦的有界性三角函數(shù)與函數(shù)的重要放縮公式:SKIPIF1<0.【典例1-1】(2023·全國·高三專題練習)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)求證:SKIPIF1<0時,SKIPIF1<0;(2)當SKIPIF1<0時,SKIPIF1<0恒成立,求實數(shù)a的取值范圍;(3)當SKIPIF1<0時,SKIPIF1<0恒成立,求實數(shù)a的取值范圍.【典例1-2】(2023上·全國·高三期末)已知函數(shù)SKIPIF1<0.(1)求曲線SKIPIF1<0在點SKIPIF1<0處的切線方程;(2)求SKIPIF1<0在區(qū)間SKIPIF1<0上的最大值;(3)設(shè)實數(shù)a使得SKIPIF1<0對SKIPIF1<0恒成立,求a的最大整數(shù)值.【變式1-1】(2023上·湖北省直轄縣級單位·高三??茧A段練習)已知函數(shù)SKIPIF1<0.(1)討論SKIPIF1<0的單調(diào)性;(2)若不等式SKIPIF1<0對任意SKIPIF1<0恒成立,求實數(shù)SKIPIF1<0的取值范圍.【變式1-2】(2023上·甘肅定西·高三甘肅省臨洮中學校考階段練習)已知函數(shù)SKIPIF1<0為其導函數(shù).(1)求SKIPIF1<0在SKIPIF1<0上極值點的個數(shù);(2)若SKIPIF1<0對SKIPIF1<0恒成立,求SKIPIF1<0的值.題型03恒成立求參:雙變量型【解題攻略】一般地,已知函數(shù)SKIPIF1<0,SKIPIF1<0(1)若SKIPIF1<0,SKIPIF1<0,總有SKIPIF1<0成立,故SKIPIF1<0;(2)若SKIPIF1<0,SKIPIF1<0,有SKIPIF1<0成立,故SKIPIF1<0;(3)若SKIPIF1<0,SKIPIF1<0,有SKIPIF1<0成立,故SKIPIF1<0;(4)若SKIPIF1<0,SKIPIF1<0,有SKIPIF1<0成立,故SKIPIF1<0.【典例1-1】(2023·四川攀枝花·統(tǒng)考模擬預測)已知函數(shù)SKIPIF1<0.(1)當SKIPIF1<0時,求SKIPIF1<0的單調(diào)區(qū)間;(2)設(shè)函數(shù)SKIPIF1<0,當SKIPIF1<0有兩個極值點SKIPIF1<0時,總有SKIPIF1<0成立,求實數(shù)SKIPIF1<0的值.【典例1-2】(2024上·四川成都·高三成都七中校考階段練習)設(shè)函數(shù)SKIPIF1<0,其中SKIPIF1<0.(1)討論函數(shù)SKIPIF1<0在SKIPIF1<0上的極值;(2)若函數(shù)f(x)有兩零點SKIPIF1<0,且滿足SKIPIF1<0,求正實數(shù)SKIPIF1<0的取值范圍.【變式1-1】(2023·上海松江·??寄M預測)已知函數(shù)SKIPIF1<0.(1)若SKIPIF1<0,求函數(shù)SKIPIF1<0的極值點;(2)若不等式SKIPIF1<0恒成立,求實數(shù)a的取值范圍;(3)若函數(shù)SKIPIF1<0有三個不同的極值點SKIPIF1<0、SKIPIF1<0、SKIPIF1<0,且SKIPIF1<0,求實數(shù)a的取值范圍.【變式1-2】(2023下·山東德州·高三校考階段練習)已知函數(shù)SKIPIF1<0,其中SKIPIF1<0.(1)討論函數(shù)SKIPIF1<0的單調(diào)性;(2)若SKIPIF1<0存在兩個極值點SKIPIF1<0的取值范圍為SKIPIF1<0,求a的取值范圍.題型04恒成立求參:整數(shù)型【解題攻略】恒成立求參的一般規(guī)律①若SKIPIF1<0在SKIPIF1<0上恒成立,則SKIPIF1<0;②若SKIPIF1<0在SKIPIF1<0上恒成立,則SKIPIF1<0;③若SKIPIF1<0在SKIPIF1<0上有解,則SKIPIF1<0;④若SKIPIF1<0在SKIPIF1<0上有解,則SKIPIF1<0;如果參數(shù)涉及到整數(shù),要注意對應(yīng)解中相鄰兩個整數(shù)點函數(shù)的符號【典例1-1】(2023上·湖北·高三校聯(lián)考階段練習)已知SKIPIF1<0.(1)若SKIPIF1<0恒成立,求實數(shù)SKIPIF1<0的取值范同:(2)設(shè)SKIPIF1<0表示不超過SKIPIF1<0的最大整數(shù),已知SKIPIF1<0的解集為SKIPIF1<0,求SKIPIF1<0.(參考數(shù)據(jù):SKIPIF1<0,SKIPIF1<0,SKIPIF1<0)【典例1-2】(2023上·浙江·高三校聯(lián)考階段練習)已知函數(shù)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為自然對數(shù)底數(shù).(1)證明:當SKIPIF1<0時,SKIPIF1<0;(2)若不等式SKIPIF1<0對任意的SKIPIF1<0恒成立,求整數(shù)SKIPIF1<0的最小值.【變式1-1】(2023·江西景德鎮(zhèn)·統(tǒng)考一模)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)若SKIPIF1<0,求函數(shù)SKIPIF1<0值域;(2)是否存在正整數(shù)a使得SKIPIF1<0恒成立?若存在,求出正整數(shù)a的取值集合;若不存在,請說明理由.【變式1-2】(2023·全國·高三專題練習)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)若函數(shù)SKIPIF1<0的圖象在點SKIPIF1<0處的切線與函數(shù)SKIPIF1<0的圖象相切,求k的值;(2)若SKIPIF1<0,且SKIPIF1<0時,恒有SKIPIF1<0,求k的最大值.(參考數(shù)據(jù):SKIPIF1<0)題型05恒成立求參:三角函數(shù)型整數(shù)【典例1-1】(2020·云南昆明·統(tǒng)考三模)已知SKIPIF1<0.(1)證明:SKIPIF1<0;(2)對任意SKIPIF1<0,SKIPIF1<0,求整數(shù)SKIPIF1<0的最大值.(參考數(shù)據(jù):SKIPIF1<0)【典例1-2】(2020上·浙江·高三校聯(lián)考階段練習)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)若SKIPIF1<0,求函數(shù)SKIPIF1<0在SKIPIF1<0上的單調(diào)區(qū)間;(2)若SKIPIF1<0,不等式SKIPIF1<0對任意SKIPIF1<0恒成立,求滿足條件的最大整數(shù)b.【變式1-1】(2022·全國·高三專題練習)已知函數(shù)SKIPIF1<0,SKIPIF1<0為SKIPIF1<0的導函數(shù).(1)討論SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)極值點的個數(shù);(2)若SKIPIF1<0,SKIPIF1<0時,SKIPIF1<0恒成立,求整數(shù)SKIPIF1<0的最小值.【變式1-2】(2023·云南保山·統(tǒng)考二模)設(shè)函數(shù)SKIPIF1<0,SKIPIF1<0(1)求SKIPIF1<0在區(qū)間SKIPIF1<0上的極值點個數(shù);(2)若SKIPIF1<0為SKIPIF1<0的極值點,則SKIPIF1<0,求整數(shù)SKIPIF1<0的最大值./題型06“能”成立求參:常規(guī)型【解題攻略】形如SKIPIF1<0的有解的求解策略:1、構(gòu)造函數(shù)法:令SKIPIF1<0,利用導數(shù)求得函數(shù)SKIPIF1<0的單調(diào)性與最小值,只需SKIPIF1<0恒成立即可;2、參數(shù)分離法:轉(zhuǎn)化為SKIPIF1<0或SKIPIF1<0恒成立,即SKIPIF1<0或SKIPIF1<0恒成立,只需利用導數(shù)求得函數(shù)SKIPIF1<0的單調(diào)性與最值即可.【典例1-1】(2023上·浙江·高三浙江省長興中學校聯(lián)考期中)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)討論函數(shù)SKIPIF1<0的單調(diào)性;(2)若存在SKIPIF1<0,使SKIPIF1<0成立,求實數(shù)SKIPIF1<0的取值范圍.注:SKIPIF1<0為自然對數(shù)的底數(shù).【典例1-2】(2023上·湖南長沙·高三統(tǒng)考階段練習)已知函數(shù)SKIPIF1<0,SKIPIF1<0是SKIPIF1<0的導函數(shù).(1)若SKIPIF1<0,求SKIPIF1<0的單調(diào)區(qū)間;(2)若存在實數(shù)SKIPIF1<0使SKIPIF1<0成立,求SKIPIF1<0的取值范圍.【變式1-1】(2023·全國·模擬預測)已知函數(shù)SKIPIF1<0.(1)討論SKIPIF1<0的單調(diào)性;(2)若存在SKIPIF1<0,使得SKIPIF1<0,求實數(shù)SKIPIF1<0的最小值.【變式1-2】(2023上·黑龍江齊齊哈爾·高三統(tǒng)考階段練習)已知函數(shù)SKIPIF1<0.(1)若SKIPIF1<0,求函數(shù)SKIPIF1<0的單調(diào)區(qū)間;(2)若存在SKIPIF1<0,使得SKIPIF1<0,求SKIPIF1<0的取值范圍.題型07“能”成立求參:雙變量型【解題攻略】一般地,已知函數(shù)SKIPIF1<0,SKIPIF1<0(1)相等關(guān)系記SKIPIF1<0的值域為A,SKIPIF1<0的值域為B,①若SKIPIF1<0,SKIPIF1<0,有SKIPIF1<0成立,則有SKIPIF1<0;②若SKIPIF1<0,SKIPIF1<0,有SKIPIF1<0成立,則有SKIPIF1<0;③若SKIPIF1<0,SKIPIF1<0,有SKIPIF1<0成立,故SKIPIF1<0;(2)不等關(guān)系(1)若SKIPIF1<0,SKIPIF1<0,總有SKIPIF1<0成立,故SKIPIF1<0;(2)若SKIPIF1<0,SKIPIF1<0,有SKIPIF1<0成立,故SKIPIF1<0;(3)若SKIPIF1<0,SKIPIF1<0,有SKIPIF1<0成立,故SKIPIF1<0;(4)若SKIPIF1<0,SKIPIF1<0,有SKIPIF1<0成立,故SKIPIF1<0.【典例1-1】(2022·江西上饒·高三校聯(lián)考階段練習)已知函數(shù)SKIPIF1<0,其中a≠0.(1)若SKIPIF1<0,討論函數(shù)f(x)的單調(diào)性;(2)是否存在實數(shù)a,對任意SKIPIF1<0,總存在SKIPIF1<0,使得SKIPIF1<0成立?若存在,求出實數(shù)a的值;若不存在,請說明理由.【典例1-2】(2023上·遼寧沈陽·高三沈陽二十中??茧A段練習)已知函數(shù)SKIPIF1<0.(1)討論函數(shù)SKIPIF1<0的單調(diào)性;(2)若存在SKIPIF1<0,SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,求實數(shù)a的取值范圍.【變式1-1】(2023·全國·高三專題練習)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)若曲線SKIPIF1<0在SKIPIF1<0和SKIPIF1<0處的切線互相平行,求SKIPIF1<0的值;(2)求SKIPIF1<0的單調(diào)區(qū)間;(3)若對任意SKIPIF1<0,均存在SKIPIF1<0,使得SKIPIF1<0,求SKIPIF1<0的取值范圍.【變式1-2】(2023上·重慶·高三校聯(lián)考階段練習)已知函數(shù)SKIPIF1<0.(1)當SKIPIF1<0時,求函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上的最大值和最小值;(2)若對任意的SKIPIF1<0,均存在SKIPIF1<0,使得SKIPIF1<0,求a的取值范圍.題型08“能”成立求參:正余弦型【典例1-1】(2017·江蘇淮安·高三江蘇省淮安中學階段練習)函數(shù)SKIPIF1<0.(1)求證:函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)至少有一個零點;(2)若函數(shù)SKIPIF1<0在SKIPIF1<0處取極值,且SKIPIF1<0,使得SKIPIF1<0成立,求實數(shù)SKIPIF1<0的取值范圍.【典例1-2】(2023·全國·高三專題練習)已知函數(shù)f(x)=x+2﹣2cosx(1)求函數(shù)f(x)在[SKIPIF1<0,SKIPIF1<0]上的最值:(2)若存在x∈(0,SKIPIF1<0)使不等式f(x)≤ax成立,求實數(shù)a的取值范圍【變式1-1】(2020·四川瀘州·統(tǒng)考二模)已知函數(shù)SKIPIF1<0.(1)求證:當x∈(0,π]時,f(x)<1;(2)求證:當m>2時,對任意x0∈(0,π],存在x1∈(0,π]和x2∈(0,π](x1≠x2)使g(x1)=g(x2)=f(x0)成立.【變式1-2】(2023·全國·高三專題練習)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)若SKIPIF1<0在SKIPIF1<0處的切線為SKIPIF1<0,求SKIPIF1<0的值;(2)若存在SKIPIF1<0,使得SKIPIF1<0,求實數(shù)SKIPIF1<0的取值范圍.題型09零點型求參:常規(guī)型【解題攻略】零點常規(guī)型求參基礎(chǔ):分類討論思想與轉(zhuǎn)化化歸思想數(shù)形結(jié)合與單調(diào)性的綜合應(yīng)用:一個零點,則多為所求范圍內(nèi)的單調(diào)函數(shù),或者“類二次函數(shù)”切線處(極值點處)3.注意“找點”難度,對于普通學生,可以用極限思維代替“找點思維”。【典例1-1】(2023上·安徽安慶·高一安慶市第二中學??茧A段練習)已知函數(shù)SKIPIF1<0為SKIPIF1<0上的偶函數(shù),SKIPIF1<0為SKIPIF1<0上的奇函數(shù),且SKIPIF1<0.(1)求SKIPIF1<0的解析式;(2)若函數(shù)SKIPIF1<0在SKIPIF1<0上只有一個零點,求實數(shù)SKIPIF1<0的取值范圍.【典例1-2】(2023上·四川內(nèi)江·高一四川省內(nèi)江市第六中學校考階段練習)已知函數(shù)SKIPIF1<0是偶函數(shù).(1)求SKIPIF1<0的值;(2)若函數(shù)SKIPIF1<0無零點,求SKIPIF1<0的取值范圍;(3)設(shè)SKIPIF1<0,(其中實數(shù)SKIPIF1<0).若函數(shù)SKIPIF1<0有且只有一個零點,求SKIPIF1<0的取值范圍.【變式1-1】(2023上·江蘇南通·高三統(tǒng)考期中)已知SKIPIF1<0.(1)試判斷函數(shù)SKIPIF1<0的單調(diào)性;(2)若函數(shù)SKIPIF1<0有且只有一個零點,求實數(shù)a的取值范圍.【變式1-2】(2023·陜西漢中·校聯(lián)考模擬預測)已知函數(shù)SKIPIF1<0.(1)若函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,求SKIPIF1<0的最小值;(2)若函數(shù)SKIPIF1<0有且只有一個零點,求SKIPIF1<0的取值范圍.題型10零點型求參:雙零點型【解題攻略】利用導數(shù)解決SKIPIF1<0有兩個零點,求實數(shù)SKIPIF1<0的取值范圍問題,綜合性強,難點在于要分類討論參數(shù)的范圍,進而判斷函數(shù)的單調(diào)性,確定極值的正負問題,關(guān)鍵在于要多次構(gòu)造函數(shù),利用導數(shù)判斷函數(shù)單調(diào)性.【典例1-1】(2023·全國·模擬預測)已知函數(shù)SKIPIF1<0.(1)當SKIPIF1<0時,求曲線SKIPIF1<0過原點的切線的方程.(2)若SKIPIF1<0有兩個零點,求實數(shù)SKIPIF1<0的取值范圍.【典例1-2】(2023·四川瀘州·統(tǒng)考一模)已知函數(shù)SKIPIF1<0,且SKIPIF1<0恒成立.(1)求實數(shù)SKIPIF1<0的最大值;(2)若函數(shù)SKIPIF1<0有兩個零點,求實數(shù)SKIPIF1<0的取值范圍.【變式1-1】(2023·四川綿陽·鹽亭中學??寄M預測)已知函數(shù)SKIPIF1<0.(1)當SKIPIF1<0時,求SKIPIF1<0的圖象在SKIPIF1<0處的切線方程;(2)若函數(shù)SKIPIF1<0有兩個零點,求實數(shù)SKIPIF1<0的取值范圍.【變式1-2】(2023下·山西晉城·高三??茧A段練習)已知函數(shù)SKIPIF1<0.(1)求SKIPIF1<0的單調(diào)區(qū)間;(2)若SKIPIF1<0有兩個零點,求實數(shù)SKIPIF1<0的取值范圍.題型11零點型求參:多零點綜合型【解題攻略】三個以及三個以上零點,較復雜,綜合度較大。1、三個零點型,注意是否有容易觀察出來的零點,這樣可以轉(zhuǎn)化為兩個零點型以降低難度。2、三個零點型,可通過討論,研究函數(shù)是否是“類一元三次函數(shù)”型。3、如果函數(shù)有“斷點”,注意分段討論研究?!镜淅?-1】(2021下·重慶江北·高三??茧A段練習)已知函數(shù)SKIPIF1<0SKIPIF1<0.(1)當SKIPIF1<0時,討論SKIPIF1<0的單調(diào)性;(2)已知函數(shù)SKIPIF1<0,記函數(shù)SKIPIF1<0SKIPIF1<0,若函數(shù)SKIPIF1<0有三個零點,求實數(shù)SKIPIF1<0的取值范圍.【典例1-2】(2022上·廣西欽州·高三??茧A段練習)已知SKIPIF1<0在區(qū)間SKIPIF1<0,SKIPIF1<0上的值域SKIPIF1<0,SKIPIF1<0.(1)求SKIPIF1<0的值;(2)若不等式SKIPIF1<0在SKIPIF1<0,SKIPIF1<0上恒成立,求實數(shù)SKIPIF1<0的取值范圍;(3)若函數(shù)SKIPIF1<0有三個零點,求實數(shù)SKIPIF1<0的取值范圍.【變式1-1】(2020·浙江·模擬預測)已知函數(shù)SKIPIF1<0.(1)求函數(shù)SKIPIF1<0的最值;(2)已知函數(shù)SKIPIF1<0,設(shè)函數(shù)SKIPIF1<0,若函數(shù)SKIPIF1<0有三個零點,求實數(shù)SKIPIF1<0的取值范圍.【變式1-2】(2022上·福建泉州·高三??奸_學考試)已知函數(shù)SKIPIF1<0.(1)求函數(shù)SKIPIF1<0的極值點;(2)當SKIPIF1<0時,當函數(shù)SKIPIF1<0恰有三個不同的零點,求實數(shù)SKIPIF1<0的取值范圍.題型12同構(gòu)型求參:x1,x2雙變量同構(gòu)【解題攻略】雙變量同構(gòu)型,較多的是含有絕對值型。1.含絕對值型,大多數(shù)都是有單調(diào)性的,所以可以通過討論去掉絕對值。2.去掉絕對值,可以通過“同構(gòu)”重新構(gòu)造函數(shù)。不含絕對值型,可以直接調(diào)整構(gòu)造函數(shù)求解【典例1-1】(2019·河南鄭州·統(tǒng)考二模)已知函數(shù)SKIPIF1<0.(1)曲線SKIPIF1<0在點SKIPIF1<0處的切線方程為SKIPIF1<0,求SKIPIF1<0,SKIPIF1<0的值;(2)若SKIPIF1<0,SKIPIF1<0時,SKIPIF1<0,都有SKIPIF1<0,求SKIPIF1<0的取值范圍.【典例1-2】(2020上·河南三門峽·高二統(tǒng)考期末)已知函數(shù)SKIPIF1<0.(Ⅰ)若SKIPIF1<0在SKIPIF1<0處的切線方程為SKIPIF1<0,求a的值;(Ⅱ)若SKIPIF1<0,SKIPIF1<0,都有SKIPIF1<0恒成立,求實數(shù)a的取值范圍.【變式1-1】(2019上·河南平頂山·高三統(tǒng)考階段練習)已知函數(shù)SKIPIF1<0.(1)求函數(shù)SKIPIF1<0的單調(diào)區(qū)間;(2)設(shè)SKIPIF1<0,若對任意SKIPIF1<0、SKIPIF1<0,且SKIPIF1<0,都有SKIPIF1<0,求實數(shù)SKIPIF1<0的取值范圍.【變式1-2】(2019上·河南平頂山·高三統(tǒng)考階段練習)已知函數(shù)SKIPIF1<0.(Ⅰ)求函數(shù)SKIPIF1<0的單調(diào)區(qū)間;(Ⅱ)設(shè)SKIPIF1<0,SKIPIF1<0,若對任意SKIPIF1<0,且SKIPIF1<0,都有SKIPIF1<0,求實數(shù)SKIPIF1<0的取值范圍..題型13虛設(shè)零點型求參【解題攻略】虛設(shè)零點轉(zhuǎn)化技巧:(1)、整體代換:把超越式子(多為指數(shù)和對數(shù)式子)轉(zhuǎn)化為普通的(如二次函數(shù)一次哈數(shù)等)可解式子,如比值代換等等。(2)、反代消參:反解參數(shù)代入,構(gòu)造單一變量的函數(shù)。如果要求解(或者要證明)的結(jié)論與參數(shù)無關(guān),則可以通過反解參數(shù),用變量(零點)表示參數(shù),然后把函數(shù)變成關(guān)于零點的單一函數(shù),再對單一變量求導就可以解決相應(yīng)的問題。(3)留參降次(留參、消去指對等超越項):如果要求解的與參數(shù)有關(guān),則可以通過消去超越項,建立含參數(shù)的方程或者不等式。恒等變形或者化簡方向時保留參數(shù),通過“降次”變換,一直降到不可再降為止,再結(jié)合條件,求解方程或者不等式,解的相應(yīng)的參數(shù)值或者參數(shù)范圍?!镜淅?-1】(2023·河南安陽·統(tǒng)考二模)已知函數(shù)SKIPIF1<0,SKIPIF1<0.(1)若曲線SKIPIF1<0有兩條過點SKIPIF1<0的切線,求實數(shù)m的取值范圍;(2)若當SKIPIF1<0時,不等式SKIPIF1<0恒成立,求實數(shù)a的取值集合.【典例1-2】(2023·天津河北·統(tǒng)考一模)已知函數(shù)SKIPIF1<0.(1)求曲線SKIPIF1<0在點SKIPIF1<0處的切線方程;(2)討論函數(shù)SKIPIF1<0的單調(diào)性;(3)若對任意的SKIPIF1<0,都有SKIPIF1<0成立,求整數(shù)SKIPIF1<0的最大值.【變式1-1】(2023·河南安陽·統(tǒng)考三模)已知函數(shù)SKIPIF1<0.(1)證明:曲線SKIPIF1<0在SKIPIF1<0處的切線經(jīng)過坐標原點;(2)記SKIPIF1<0的導函數(shù)為SKIPIF1<0,設(shè)SKIPIF1<0,求使SKIPIF1<0恒成立的SKIPIF1<0的取值范圍.【變式1-2】(2023·甘肅蘭州·??寄M預測)已知函數(shù)SKIPIF1<0,SKIPIF1<0(SKIPIF1<0,SKIPIF1<0為自然對數(shù)的底數(shù)).(1)求函數(shù)SKIPIF1<0的極值;(2)若對SKIPIF1<0,SKIPIF1<0恒成立,求SKIPIF1<0的取值范圍.高考練場1.(2024·全國·模擬預測)已知函數(shù)SKIPIF1<0.(1)當SKIPIF1<0時,討論函數(shù)SKIPIF1<0的單調(diào)性;(2)若SKIPIF1<0在SKIPIF1<0上恒成立,求SKIPIF1<0的取值范圍.2.(2023上·湖北荊州·高三沙市中學??茧A段練習)設(shè)函數(shù)SKIPIF1<0.(1)討論SKIPIF1<0在區(qū)間SKIPIF1<0上的單調(diào)性;(2)若SKIPIF1<0在SKIPIF1<0上恒成立,求SKIPIF1<0的取值范圍.3.(2023·山東德州·三模)已知函數(shù)SKIPIF1<0,其中SKIPIF1<0.(1)當SKIPIF1<0時,求函數(shù)SKIPIF1<0在SKIPIF1<0處的切線方程;(2)討論函數(shù)SKIPIF1<0的單調(diào)性;(3)若SKIPIF1<0存在兩個極值點SKIPIF1<0的取值范圍為SKIPIF1<0,求SKIPIF1<0的取值范圍.4.(2023下·陜西渭南·高二合陽縣合陽中學??计谀┮阎瘮?shù)SKIPIF1<0(1)若SKIPIF1<0,討論SKIPIF1<0的單調(diào)性.(2)當SKIPIF1<0時,都有SKIPIF1<0成立,求整數(shù)SKIPIF1<0的最大值.5.(2023·江蘇揚州·統(tǒng)考模擬預測)已知函數(shù)SKIPIF1<0.(1)若SKIPIF1<0,求證:SKIPIF1<0;(2)當SKIPIF1<0時,對任意SKIPIF1<0,都有SKIPIF1<0,求整數(shù)SKIPIF1<0的最大值.6.(2023上·廣東·高三河源市河源中學校聯(lián)考階段練習)已知函數(shù)SKIPIF1<0.(1)試討論SKIPIF1<0的極值點的個數(shù);(2)若SKIPIF1<0,且對任意的SKIPIF1<0都有S

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