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專題03利用函數(shù)的單調(diào)性求參數(shù)取值范圍一、單選題1.已知函數(shù)SKIPIF1<0在SKIPIF1<0上為單調(diào)遞增函數(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<0【解析】SKIPIF1<0,因?yàn)镾KIPIF1<0在SKIPIF1<0上為單調(diào)遞增函數(shù),故SKIPIF1<0在SKIPIF1<0上恒成立,所以SKIPIF1<0即SKIPIF1<0,故選:A.2.若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)單調(diào)遞增,則a的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【解析】由SKIPIF1<0,因?yàn)楹瘮?shù)SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)單調(diào)遞增,所以有SKIPIF1<0在SKIPIF1<0上恒成立,即SKIPIF1<0在SKIPIF1<0上恒成立,因?yàn)镾KIPIF1<0,所以由SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,于是有SKIPIF1<0,故選:D3.若函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則實(shí)數(shù)a的取值范圍是()A.(-1,1) B.SKIPIF1<0 C.(-1,+∞) D.(-1,0)【解析】SKIPIF1<0,由題意得:SKIPIF1<0,即SKIPIF1<0在SKIPIF1<0上恒成立,因?yàn)镾KIPIF1<0,所以SKIPIF1<0恒成立,故實(shí)數(shù)a的取值范圍是SKIPIF1<0.故選:B4.若函數(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<0C.SKIPIF1<0 D.SKIPIF1<0【解析】由題意SKIPIF1<0在SKIPIF1<0上恒成立,SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0是增函數(shù),SKIPIF1<0(SKIPIF1<0時(shí)取得),所以SKIPIF1<0.故選:A.5.若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)存在單調(diào)遞增區(qū)間,則實(shí)數(shù)a的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【解析】由SKIPIF1<0可得:SKIPIF1<0.因?yàn)楹瘮?shù)SKIPIF1<0在區(qū)間SKIPIF1<0內(nèi)存在單調(diào)遞增區(qū)間,所以SKIPIF1<0在SKIPIF1<0上有解,即SKIPIF1<0在SKIPIF1<0上有解.設(shè)SKIPIF1<0,由SKIPIF1<0在SKIPIF1<0上恒成立,所以SKIPIF1<0在SKIPIF1<0單調(diào)遞增,所以SKIPIF1<0.所以SKIPIF1<0.故選:D6.已知函數(shù)SKIPIF1<0存在三個(gè)單調(diào)區(qū)間,則實(shí)數(shù)SKIPIF1<0的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【解析】由題意,函數(shù)SKIPIF1<0,可得SKIPIF1<0,因?yàn)楹瘮?shù)SKIPIF1<0存在三個(gè)單調(diào)區(qū)間,可得SKIPIF1<0有兩個(gè)不相等的實(shí)數(shù)根,則滿足SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,即實(shí)數(shù)SKIPIF1<0的取值范圍是SKIPIF1<0.故選:C.7.若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,則實(shí)數(shù)SKIPIF1<0的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【解析】函數(shù)SKIPIF1<0,SKIPIF1<0.則SKIPIF1<0,因?yàn)镾KIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,則SKIPIF1<0在區(qū)間SKIPIF1<0上恒成立,即SKIPIF1<0,所以SKIPIF1<0在區(qū)間SKIPIF1<0上恒成立,所以SKIPIF1<0,解得SKIPIF1<0,故選:A.8.已知函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則a的取值范圍為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0或SKIPIF1<0【解析】因?yàn)楹瘮?shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0在SKIPIF1<0上恒成立,即SKIPIF1<0在SKIPIF1<0上恒成立,由SKIPIF1<0在SKIPIF1<0上單調(diào)遞增知,SKIPIF1<0,所以SKIPIF1<0,故選:C9.若SKIPIF1<0是R上的減函數(shù),則實(shí)數(shù)a的取值范圍是(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【解析】由SKIPIF1<0,得SKIPIF1<0,因?yàn)镾KIPIF1<0是R上的減函數(shù),所以SKIPIF1<0在SKIPIF1<0上恒成立,即SKIPIF1<0SKIPIF1<0在SKIPIF1<0上恒成立,由于SKIPIF1<0,所以SKIPIF1<0.故選:B.10.若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,則實(shí)數(shù)a的取值范圍為(

)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【解析】函數(shù)SKIPIF1<0SKIPIF1<0SKIPIF1<0,對(duì)SKIPIF1<0恒成立.SKIPIF1<0,SKIPIF1<0當(dāng)SKIPIF1<0時(shí),SKIPIF1<0.令SKIPIF1<0,欲使SKIPIF1<0恒成立,只需滿足SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),恒成立,即SKIPIF1<0,設(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),等號(hào)成立,即SKIPIF1<0.故選:D11.若函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,則實(shí)數(shù)SKIPIF1<0的取值范圍為A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【解析】由函數(shù)SKIPIF1<0,且f(x)在區(qū)間SKIPIF1<0上單調(diào)遞減,∴在區(qū)間SKIPIF1<0上,f′(x)=?sin2x+3a(cosx?sinx)+2a?1≤0恒成立,∵設(shè)SKIPIF1<0,∴當(dāng)x∈SKIPIF1<0時(shí),SKIPIF1<0,t∈[?1,1],即?1≤cosx?sinx≤1,令t∈[?1,1],sin2x=1?t2∈[0,1],原式等價(jià)于t2+3at+2a?2≤0,當(dāng)t∈[?1,1]時(shí)恒成立,令g(t)=t2+3at+2a?2,只需滿足SKIPIF1<0或SKIPIF1<0或SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0或SKIPIF1<0,綜上,可得實(shí)數(shù)a的取值范圍是SKIPIF1<0,故選:A.二、多選題12.若函數(shù)SKIPIF1<0,在區(qū)間SKIPIF1<0上單調(diào),則實(shí)數(shù)m的取值范圍可以是(

)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【解析】定義域?yàn)镾KIPIF1<0,SKIPIF1<0;由SKIPIF1<0得函數(shù)SKIPIF1<0的增區(qū)間為SKIPIF1<0;由SKIPIF1<0得函數(shù)SKIPIF1<0的減區(qū)間為SKIPIF1<0;因?yàn)镾KIPIF1<0在區(qū)間SKIPIF1<0上單調(diào),所以SKIPIF1<0或SKIPIF1<0解得SKIPIF1<0或SKIPIF1<0;結(jié)合選項(xiàng)可得A,C正確.故選:AC.三、填空題13.若函數(shù)SKIPIF1<0有三個(gè)單調(diào)區(qū)間,則實(shí)數(shù)a的取值范圍是________.【解析】SKIPIF1<0,由于函數(shù)SKIPIF1<0有三個(gè)單調(diào)區(qū)間,所以SKIPIF1<0有兩個(gè)不相等的實(shí)數(shù)根,所以SKIPIF1<0.故答案為:SKIPIF1<014.已知函數(shù)SKIPIF1<0,若SKIPIF1<0的單調(diào)遞減區(qū)間是SKIPIF1<0,則實(shí)數(shù)SKIPIF1<0的值為________.【解析】由SKIPIF1<0,得SKIPIF1<0,因?yàn)镾KIPIF1<0的單調(diào)遞減區(qū)間是SKIPIF1<0,所以SKIPIF1<0的解集為SKIPIF1<0,所以SKIPIF1<0是方程SKIPIF1<0的一個(gè)根,所以SKIPIF1<0,解得SKIPIF1<015.若函數(shù)SKIPIF1<0在SKIPIF1<0單調(diào)遞增,則實(shí)數(shù)m的取值范圍為________.【解析】由SKIPIF1<0,得SKIPIF1<0,若函數(shù)SKIPIF1<0在SKIPIF1<0單調(diào)遞增,則SKIPIF1<0在SKIPIF1<0上恒成立,令SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,再令SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,因?yàn)镾KIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上恒成立,則SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,故SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),得SKIPIF1<0,此時(shí)SKIPIF1<0,則SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則SKIPIF1<0,此時(shí)符合SKIPIF1<0在SKIPIF1<0上恒成立;當(dāng)SKIPIF1<0時(shí),得SKIPIF1<0,SKIPIF1<0,使得SKIPIF1<0,故SKIPIF1<0時(shí),SKIPIF1<0,即SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0,即SKIPIF1<0,故SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,則當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,此時(shí)SKIPIF1<0,不合題意;綜上,實(shí)數(shù)m的取值范圍為SKIPIF1<0.16.已知函數(shù)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.對(duì)于任意SKIPIF1<0,且SKIPIF1<0,必有SKIPIF1<0,則SKIPIF1<0的取值范圍是___________.【解析】SKIPIF1<0定義城為SKIPIF1<0.SKIPIF1<0.故SKIPIF1<0在SKIPIF1<0內(nèi)單調(diào)遞增.對(duì)于任意SKIPIF1<0,不妨設(shè)SKIPIF1<0,則SKIPIF1<0.故SKIPIF1<0,SKIPIF1<0,SKIPIF1<0在SKIPIF1<0內(nèi)單調(diào)遞增.故SKIPIF1<0在SKIPIF1<0恒成立,即SKIPIF1<0恒成立,可知SKIPIF1<0.∴SKIPIF1<0的取值范圍為SKIPIF1<0.17.已知函數(shù)SKIPIF1<0在SKIPIF1<0上不單調(diào),則SKIPIF1<0的取值范圍是______.【解析】SKIPIF1<0,因?yàn)楹瘮?shù)SKIPIF1<0在SKIPIF1<0上不單調(diào),所以SKIPIF1<0必有解,當(dāng)SKIPIF1<0只有一個(gè)解時(shí),SKIPIF1<0得出函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,與題干矛盾,故SKIPIF1<0必有兩個(gè)不等實(shí)根則SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<018.若實(shí)數(shù)SKIPIF1<0,SKIPIF1<0,則函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0單調(diào)遞增的概率為___________.【解析】由題意SKIPIF1<0在SKIPIF1<0上恒成立,二次函數(shù)的對(duì)稱軸是SKIPIF1<0,因此SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0,易知滿足SKIPIF1<0的點(diǎn)SKIPIF1<0據(jù)區(qū)域?yàn)閳D中正方形SKIPIF1<0,面積為SKIPIF1<0,又滿足SKIPIF1<0的SKIPIF1<0在正方形SKIPIF1<0在圓SKIPIF1<0外部的部分,面積為SKIPIF1<0,所以概率為SKIPIF1<0.19.若函數(shù)SKIPIF1<0在區(qū)間(1,4)上不單調(diào),則實(shí)數(shù)a的取值范圍是___________.【解析】SKIPIF1<0函數(shù)SKIPIF1<0,SKIPIF1<0,若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上不單調(diào),則SKIPIF1<0在SKIPIF1<0上存在變號(hào)零點(diǎn),由SKIPIF1<0得SKIPIF1<0,令SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0在SKIPIF1<0遞減,在SKIPIF1<0遞增,而SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.故答案為:SKIPIF1<0.四、解答題20.已知函數(shù)SKIPIF1<0.(1)若SKIPIF1<0在區(qū)間SKIPIF1<0上為增函數(shù),求a的取值范圍.(2)若SKIPIF1<0的單調(diào)遞減區(qū)間為SKIPIF1<0,求a的值.【解析】(1)因?yàn)镾KIPIF1<0,且SKIPIF1<0在區(qū)間SKIPIF1<0上為增函數(shù),所以SKIPIF1<0在SKIPIF1<0上恒成立,即SKIPIF1<0在(1,+∞)上恒成立,所以SKIPIF1<0在SKIPIF1<0上恒成立,所以SKIPIF1<0,即a的取值范圍是SKIPIF1<0(2)由題意知SKIPIF1<0.因?yàn)镾KIPIF1<0,所以SKIPIF1<0.由SKIPIF1<0,得SKIPIF1<0,所以SKIPIF1<0的單調(diào)遞減區(qū)間為SKIPIF1<0,又已知SKIPIF1<0的單調(diào)遞減區(qū)間為SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0.21.已知函數(shù)SKIPIF1<0.(1)若SKIPIF1<0,求函數(shù)SKIPIF1<0的極值;(2)若函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,求a的取值范圍.【解析】(1)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0,得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0和SKIPIF1<0的變化情況如下表SKIPIF1<0SKIPIF1<03SKIPIF1<0SKIPIF1<0SKIPIF1<00SKIPIF1<0SKIPIF1<0遞減極小值遞增所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0取得極小值SKIPIF1<0,無(wú)極大值(2)由SKIPIF1<0(SKIPIF1<0),得SKIPIF1<0(SKIPIF1<0),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,當(dāng)SKIPIF1<0時(shí),由SKIPIF1<0,得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0和SKIPIF1<0的變化情況如下表SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<00SKIPIF1<0SKIPIF1<0遞減極小值遞增因?yàn)镾KIPIF1<0在SKIPIF1<0上單調(diào)遞增,所以SKIPIF1<0,得SKIPIF1<0,綜上,a的取值范圍為SKIPIF1<022.已知SKIPIF1<0,函數(shù)SKIPIF1<0,SKIPIF1<0為自然對(duì)數(shù)的底數(shù)).(1)當(dāng)SKIPIF1<0時(shí),求函數(shù)SKIPIF1<0的單調(diào)遞增區(qū)間;(2)若函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,求SKIPIF1<0的取值范圍;【解析】(1)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0令SKIPIF1<0,得SKIPIF1<0,SKIPIF1<0SKIPIF1<0SKIPIF1<0的單調(diào)遞增區(qū)間是SKIPIF1<0;(2)SKIPIF1<0,若SKIPIF1<0在SKIPIF1<0內(nèi)單調(diào)遞增,即當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,即SKIPIF1<0對(duì)SKIPIF1<0恒成立,即SKIPIF1<0對(duì)SKIPIF1<0恒成立,令SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,SKIPIF1<0,SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),當(dāng)且僅當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,SKIPIF1<0的取值范圍是SKIPIF1<0.23.已知函數(shù)SKIPIF1<0.(1)若曲線SKIPIF1<0在點(diǎn)SKIPIF1<0處的切線方程為SKIPIF1<0,求實(shí)數(shù)a,b的值;(2)若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上存在單調(diào)增區(qū)間,求實(shí)數(shù)a的取值范圍;(3)若SKIPIF1<0在區(qū)間SKIPIF1<0上存在極大值,求實(shí)數(shù)a的取值范圍(直接寫出結(jié)果).【解析】(1)因?yàn)镾KIPIF1<0,所以SKIPIF1<0,因?yàn)榍€SKIPIF1<0在點(diǎn)SKIPIF1<0處的切線方程為SKIPIF1<0,所以切線斜率為1,即SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.(2)因?yàn)楹瘮?shù)SKIPIF1<0在區(qū)間SKIPIF1<0上存在單調(diào)增區(qū)間,所以SKIPIF1<0在SKIPIF1<0上有解,即只需SKIPIF1<0在SKIPIF1<0上的最大值大于0即可.令SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0為增函數(shù),當(dāng)SKIPIF1<0時(shí),SKIPIF1<0為減函數(shù),所以,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0取最大值SKIPIF1<0,故只需SKIPIF1<0,即SKIPIF1<0.所以實(shí)數(shù)a的取值范圍是SKIPIF1<0.(3)SKIPIF1<024.1.已知函數(shù)SKIPIF1<0.(1)若函數(shù)SKIPIF1<0在R上單調(diào)遞增,求實(shí)數(shù)a的取值范圍;(2)若函數(shù)SKIPIF1<0的單調(diào)遞減區(qū)間是SKIPIF1<0,求實(shí)數(shù)a的值;(3)若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,求實(shí)數(shù)a的取值范圍.【解析】(1)易知SKIPIF1<0.因?yàn)镾KIPIF1<0在R上單調(diào)遞增,所以SKIPIF1<0恒成立,即SKIPIF1<0恒成立,故SKIPIF1<0.經(jīng)檢驗(yàn),當(dāng)SKIPIF1<0時(shí),符合題意,故實(shí)數(shù)a的取值范圍是SKIPIF1<0.(2)由(1),得SKIPIF1<0.因?yàn)镾KIPIF1<0的單調(diào)遞減區(qū)間是SKIPIF1<0,所以不等式SKIPIF1<0的解集為SKIPIF1<0,所以-1和1是方程SKIPIF1<0的兩個(gè)實(shí)根,所以SKIPIF1<0.(3)由(1),得SKIPIF1<0.因?yàn)楹瘮?shù)SKIPIF1<0在區(qū)間SKIPIF1<0上單調(diào)遞減,所以SKIPIF1<0在SKIPIF1<0上恒成立,即SKIPIF1<0在SKIPIF1<0上恒成立.又函數(shù)SKIPIF1<0在SKIPIF1<0上的值域?yàn)镾KIPIF1<0,所以SKIPIF1<0.故實(shí)數(shù)a的取值范圍是SKIPIF1<0.25.已知函數(shù)SKIPIF1<0.(1)當(dāng)SKIPIF1<0時(shí),求函數(shù)SKIPIF1<0的最值(2)若函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是減函數(shù),求實(shí)數(shù)a的取值范圍.【解析】(1)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0有最大值0,無(wú)最小值;(2)SKIPIF1<0,因?yàn)楹瘮?shù)SKIPIF1<0在區(qū)間SKIPIF1<0上是減函數(shù),所以SKIPIF1<0在區(qū)間SKIPIF1<0上恒成立,令SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在區(qū)間SKIPIF1<0上遞減,所以SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,所以實(shí)數(shù)a的取值范圍SKIPIF1<0.26.已知函數(shù)SKIPIF1<0.(1)當(dāng)SKIPIF1<0時(shí),求曲線SKIPIF1<0在點(diǎn)SKIPIF1<0處的切線方程;(2)若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.【解析】(1)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,所以,所求切線方程為SKIPIF1<0,即SKIPIF1<0.

(2)設(shè)SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,從而SKIPIF1<0,即SKIPIF1<0.

(i)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,若SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則SKIPIF1<0對(duì)于任意的SKIPIF1<0恒成立,即SKIPIF1<0.因?yàn)镾KIPIF1<0,所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0,又SKIPIF1<0,此時(shí)SKIPIF1<0的取值范圍為SKIPIF1<0(ii)當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則SKIPIF1<0,則SKIPIF1<0,若SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則SKIPIF1<0對(duì)于任意的SKIPIF1<0恒成立,即SKIPIF1<0.因?yàn)镾KIPIF1<0,所以當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0,此時(shí)SKIPIF1<0的取值范圍為SKIPIF1<

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