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專題19函數(shù)中的新定義問題一、單選題1.若一系列函數(shù)的解析式和值域相同,但定義域不相同,則稱這些函數(shù)為“同值函數(shù)”,例如函數(shù)SKIPIF1<0與函數(shù)SKIPIF1<0即為“同值函數(shù)”,給出下面四個函數(shù),其中能夠被用來構(gòu)造“同值函數(shù)”的是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【解析】對于A,函數(shù)SKIPIF1<0在定義域上單調(diào)遞減,所以值域確定時定義域也確定且唯一,所以不能構(gòu)造“同值函數(shù)”,故A錯誤;對于B,函數(shù)SKIPIF1<0在定義域上單調(diào)遞增,所以值域確定時定義域也確定且唯一,所以不能構(gòu)造“同值函數(shù)”,故B錯誤;對于C,函數(shù)SKIPIF1<0在定義域上單調(diào)遞增,所以值域確定時定義域也確定且唯一,所以不能構(gòu)造“同值函數(shù)”,故C錯誤;對于D,當(dāng)定義域分別為SKIPIF1<0時,值域都為SKIPIF1<0,故D正確.故選:D.2.高斯是德國著名的數(shù)學(xué)家,近代數(shù)學(xué)奠基者之一,享有“數(shù)學(xué)王子”的美譽,用其名字命名的“高斯函數(shù)":設(shè)SKIPIF1<0,用SKIPIF1<0表示不超過SKIPIF1<0的最大整數(shù),則SKIPIF1<0稱為高斯函數(shù),也稱取整函數(shù),例如:SKIPIF1<0,已知SKIPIF1<0,則函數(shù)SKIPIF1<0的值域為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【解析】因為SKIPIF1<0,所以SKIPIF1<0,則SKIPIF1<0,所以函數(shù)SKIPIF1<0的值域為SKIPIF1<0,故SKIPIF1<0的值域為-1或0.故選:B3.高斯是德國著名的數(shù)學(xué)家,近代數(shù)學(xué)奠基者之一,享有“數(shù)學(xué)王子”的稱號,設(shè)SKIPIF1<0,用SKIPIF1<0表示不超過SKIPIF1<0的最大整數(shù),SKIPIF1<0也被稱為“高斯函數(shù)”,例如SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,設(shè)SKIPIF1<0為函數(shù)SKIPIF1<0的零點,則SKIPIF1<0(
).A.2 B.3 C.4 D.5【解析】SKIPIF1<0,函數(shù)在SKIPIF1<0上單調(diào)遞增,SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0.故選:B4.若直角坐標(biāo)系內(nèi)兩點M、N滿足條件①M、N都在函數(shù)y的圖象上②M、N關(guān)于原點對稱,則稱點對SKIPIF1<0是函數(shù)y的一個“共生點對”(點對SKIPIF1<0與SKIPIF1<0看作同一個”共生點對”),已知函數(shù)SKIPIF1<0,則函數(shù)y的“共生點對”有(
)個A.0 B.1 C.2 D.3【解析】根據(jù)“共生點對”的概念知,作出函數(shù)SKIPIF1<0的圖象關(guān)于原點對稱的圖象與函數(shù)SKIPIF1<0SKIPIF1<0的圖象如下圖所示:
由圖可知它們的交點有兩個,所以函數(shù)y的“共生點對”有2對.故選:C.5.已知SKIPIF1<0,符號SKIPIF1<0表示不超過x的最大整數(shù),若函數(shù)SKIPIF1<0有且僅有2個零點,則實數(shù)a的取值范圍是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【解析】函數(shù)SKIPIF1<0有且僅有2個零點,則SKIPIF1<0有且僅有2個解,設(shè)SKIPIF1<0,根據(jù)符號SKIPIF1<0作出SKIPIF1<0的草圖如下:則SKIPIF1<0或SKIPIF1<0,故選:D.6.已知SKIPIF1<0,用SKIPIF1<0表示SKIPIF1<0,SKIPIF1<0中的最大者,記為:SKIPIF1<0.當(dāng)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0時,函數(shù)SKIPIF1<0的最小值為(
)A.0 B.1 C.2 D.4【解析】若SKIPIF1<0,則SKIPIF1<0;若SKIPIF1<0,則SKIPIF1<0或SKIPIF1<0.∵SKIPIF1<0在R上單調(diào)遞增,則有:當(dāng)SKIPIF1<0時,則SKIPIF1<0,即SKIPIF1<0;當(dāng)SKIPIF1<0或SKIPIF1<0時,則SKIPIF1<0,即SKIPIF1<0;綜上所述:SKIPIF1<0.對于SKIPIF1<0,則有:當(dāng)SKIPIF1<0時,則SKIPIF1<0在R上單調(diào)遞增,SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,∴SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,且SKIPIF1<0,則SKIPIF1<0;當(dāng)SKIPIF1<0時,則SKIPIF1<0在R上單調(diào)遞增,SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,∴SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,則SKIPIF1<0;當(dāng)SKIPIF1<0時,則SKIPIF1<0在R上單調(diào)遞增,SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,∴SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,且SKIPIF1<0,則SKIPIF1<0;綜上所述:當(dāng)SKIPIF1<0時,SKIPIF1<0有最小值SKIPIF1<0.故選:B.7.若函數(shù)SKIPIF1<0的定義域為SKIPIF1<0,若存在實數(shù)SKIPIF1<0,SKIPIF1<0,使得SKIPIF1<0,則稱SKIPIF1<0是“局部奇函數(shù)”.若函數(shù)SKIPIF1<0為SKIPIF1<0上的“局部奇函數(shù)”,則實數(shù)SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【解析】由題意知,方程SKIPIF1<0有解,則SKIPIF1<0,化簡得SKIPIF1<0,當(dāng)SKIPIF1<0時,不合題意;當(dāng)SKIPIF1<0時,可得SKIPIF1<0,因為SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時等號成立,所以SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0化簡得SKIPIF1<0,解得SKIPIF1<0;當(dāng)SKIPIF1<0時,SKIPIF1<0化簡得SKIPIF1<0,解得SKIPIF1<0,綜上所述SKIPIF1<0的取值范圍為SKIPIF1<0,故選:A8.對于定義在區(qū)間SKIPIF1<0上的函數(shù)SKIPIF1<0,若滿足:SKIPIF1<0且SKIPIF1<0,都有SKIPIF1<0,則稱函數(shù)SKIPIF1<0為區(qū)間SKIPIF1<0上的“非減函數(shù)”,若SKIPIF1<0為區(qū)間SKIPIF1<0上的“非減函數(shù)”,且SKIPIF1<0,又當(dāng)SKIPIF1<0時,SKIPIF1<0恒成立,下列命題中正確的有(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【解析】對于A中,由SKIPIF1<0,令SKIPIF1<0,則有SKIPIF1<0,可得SKIPIF1<0,故A不正確;對于B中,當(dāng)SKIPIF1<0時,SKIPIF1<0,又由SKIPIF1<0,所以SKIPIF1<0,因為SKIPIF1<0,故B不正確;對于C中,因為SKIPIF1<0,因為SKIPIF1<0且SKIPIF1<0,都有SKIPIF1<0,所以當(dāng)SKIPIF1<0時,SKIPIF1<0,故C不正確;對于D中,當(dāng)SKIPIF1<0時,SKIPIF1<0,可得SKIPIF1<0,又由SKIPIF1<0,所以SKIPIF1<0時,SKIPIF1<0,所以SKIPIF1<0,故D正確;故選:D.二、多選題9.設(shè)函數(shù)SKIPIF1<0的定義域為SKIPIF1<0,如果對任意的SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,總有SKIPIF1<0成立,則稱函數(shù)SKIPIF1<0在SKIPIF1<0上為線增函數(shù).下列函數(shù)中在其定義域上為線增函數(shù)的有(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0,SKIPIF1<0【解析】由SKIPIF1<0得:SKIPIF1<0;對于A,SKIPIF1<0的定義域為SKIPIF1<0,不妨設(shè)SKIPIF1<0,SKIPIF1<0SKIPIF1<0;當(dāng)SKIPIF1<0時,SKIPIF1<0,SKIPIF1<0不是線增函數(shù),A錯誤;對于B,SKIPIF1<0的定義域為SKIPIF1<0,不妨設(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是線增函數(shù),B正確;對于C,SKIPIF1<0的定義域為SKIPIF1<0,不妨設(shè)SKIPIF1<0,SKIPIF1<0SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是線增函數(shù),C正確;對于D,SKIPIF1<0,SKIPIF1<0,不妨設(shè)SKIPIF1<0,SKIPIF1<0SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是線增函數(shù),D正確.故選:BCD.10.設(shè)函數(shù)SKIPIF1<0的定義域為A,若對于A內(nèi)任意兩個值SKIPIF1<0,SKIPIF1<0,都有SKIPIF1<0,則稱SKIPIF1<0具有T性質(zhì).下列函數(shù)中具有T性質(zhì)的是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【解析】由題意,T性質(zhì)滿足SKIPIF1<0,則函數(shù)為上凸或直線類的函數(shù),A為直線,滿足條件;B為下凹函數(shù)不滿足,CD均為上凸的函數(shù),滿足條件.故選:ACD.11.設(shè)函數(shù)SKIPIF1<0,SKIPIF1<0定義域交集為SKIPIF1<0,若存在SKIPIF1<0,使得對任意SKIPIF1<0都有SKIPIF1<0,則稱SKIPIF1<0構(gòu)成“相關(guān)函數(shù)對”.則下列所給兩個函數(shù)構(gòu)成“相關(guān)函數(shù)對”的有(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【解析】根據(jù)“相關(guān)函數(shù)對”的定義,可得兩個函數(shù)的圖象有且只有一個交點SKIPIF1<0,且在SKIPIF1<0的右側(cè)圖象中SKIPIF1<0的圖象高于SKIPIF1<0的圖象,在SKIPIF1<0的左側(cè)圖象中SKIPIF1<0的圖象低于SKIPIF1<0的圖象.對于A項,令SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,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,即SKIPIF1<0恒成立,所以不符合題意,故A項不成立;對于B項,令SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,又因為SKIPIF1<0,SKIPIF1<0,所以由零點存在性定理知,存在唯一SKIPIF1<0,使得SKIPIF1<0,則對任意SKIPIF1<0,不等式SKIPIF1<0恒成立,符合題意,故B項正確;對于C項,SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0在SKIPIF1<0單調(diào)遞增,又因為SKIPIF1<0,SKIPIF1<0,所以由零點存在性定理知,存在唯一SKIPIF1<0,使得SKIPIF1<0,則對任意SKIPIF1<0,不等式SKIPIF1<0恒成立,符合題意,故C項正確;對于D項,因為SKIPIF1<0,解得:SKIPIF1<0或SKIPIF1<0,所以SKIPIF1<0圖象與SKIPIF1<0圖象有兩個交點,不符合題意,故D項不成立.故選:BC.12.已知符號函數(shù)SKIPIF1<0,偶函數(shù)SKIPIF1<0滿足SKIPIF1<0,當(dāng)SKIPIF1<0時,SKIPIF1<0,則下列結(jié)論不正確的是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【解析】當(dāng)SKIPIF1<0時,SKIPIF1<0,而SKIPIF1<0是偶函數(shù),則當(dāng)SKIPIF1<0,SKIPIF1<0,因此當(dāng)SKIPIF1<0時,SKIPIF1<0,其取值集合為SKIPIF1<0,又SKIPIF1<0,即SKIPIF1<0是周期為2的函數(shù),于是函數(shù)SKIPIF1<0的值域為SKIPIF1<0,SKIPIF1<0的部分圖象,如圖,
當(dāng)SKIPIF1<0時,SKIPIF1<0,A錯誤;SKIPIF1<0,B錯誤;當(dāng)SKIPIF1<0時,SKIPIF1<0,C正確;當(dāng)SKIPIF1<0時,取SKIPIF1<0,則SKIPIF1<0,此時SKIPIF1<0,D錯誤.故選:ABD三、填空題13.對于函數(shù)SKIPIF1<0,若在其圖象上存在兩點關(guān)于原點對稱,則稱SKIPIF1<0為“倒戈函數(shù)”,設(shè)函數(shù)SKIPIF1<0是定義在SKIPIF1<0上的“倒戈函數(shù)”,則實數(shù)m的取值范圍是_______.【解析】因為函數(shù)SKIPIF1<0是定義在SKIPIF1<0上的“倒戈函數(shù)”,所以存在SKIPIF1<0,使SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,所以SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0,即SKIPIF1<0時取等號,解得SKIPIF1<0,當(dāng)SKIPIF1<0或SKIPIF1<0時,SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0.14.已知函數(shù)SKIPIF1<0,SKIPIF1<0,對任意的a,b,SKIPIF1<0,都存在以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為三邊的三角形,則稱該函數(shù)為三角形函數(shù).若函數(shù)SKIPIF1<0是三角形函數(shù),則實數(shù)m的取值范圍是______.【解析】當(dāng)SKIPIF1<0時,SKIPIF1<0;當(dāng)SKIPIF1<0時,SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,由對勾函數(shù)性質(zhì)可知,SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,在SKIPIF1<0上單調(diào)遞增,又SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0.不妨設(shè)SKIPIF1<0,則對任意的a,b,SKIPIF1<0,都存在以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為三邊的三角形,等價于對任意的a,b,SKIPIF1<0,都有SKIPIF1<0,等價于SKIPIF1<0.當(dāng)SKIPIF1<0,即SKIPIF1<0時,SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0;當(dāng)SKIPIF1<0,即SKIPIF1<0時,SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0;當(dāng)SKIPIF1<0,即SKIPIF1<0時,SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0.綜上,實數(shù)m的取值范圍為SKIPIF1<0.15.對于函數(shù)SKIPIF1<0,如果存在區(qū)間SKIPIF1<0,同時滿足下列條件:①SKIPIF1<0在SKIPIF1<0上是單調(diào)的;②當(dāng)SKIPIF1<0的定義域是SKIPIF1<0時,SKIPIF1<0的值域是SKIPIF1<0,則稱SKIPIF1<0是該函數(shù)的“倍值區(qū)間”.若函數(shù)SKIPIF1<0存在“倍值區(qū)間”,則a的取值范圍是______.【解析】由函數(shù)SKIPIF1<0單調(diào)遞增,且函數(shù)SKIPIF1<0存在“倍值區(qū)間”,知存在SKIPIF1<0,使得SKIPIF1<0,設(shè)SKIPIF1<0則SKIPIF1<0,且SKIPIF1<0,所以SKIPIF1<0,因此二次函數(shù)SKIPIF1<0在SKIPIF1<0上有兩個零點SKIPIF1<0,SKIPIF1<0且SKIPIF1<0,則SKIPIF1<0,解得SKIPIF1<0,故答案為:SKIPIF1<0.16.對于三次函數(shù)SKIPIF1<0,給出定義:設(shè)SKIPIF1<0是SKIPIF1<0的導(dǎo)數(shù),SKIPIF1<0是SKIPIF1<0的導(dǎo)數(shù),若方程SKIPIF1<0有實數(shù)解SKIPIF1<0,則稱點SKIPIF1<0為曲線SKIPIF1<0的“拐點”,可以發(fā)現(xiàn),任何一個三次函數(shù)都有“拐點”.設(shè)函數(shù)SKIPIF1<0,則SKIPIF1<0SKIPIF1<0______.【解析】因為SKIPIF1<0,所以SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0,可得SKIPIF1<0,又SKIPIF1<0SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0.四、解答題17.對于實數(shù)a和b,定義運算“*”:SKIPIF1<0,設(shè)SKIPIF1<0.(1)求SKIPIF1<0的解析式;(2)關(guān)于x的方程SKIPIF1<0恰有三個互不相等的實數(shù)根,求m的取值范圍.【解析】(1)由SKIPIF1<0可得SKIPIF1<0,由SKIPIF1<0可得SKIPIF1<0,所以根據(jù)題意得SKIPIF1<0,即SKIPIF1<0.(2)作出函數(shù)SKIPIF1<0的圖象如圖,當(dāng)SKIPIF1<0時,SKIPIF1<0開口向下,對稱軸為SKIPIF1<0,所以當(dāng)SKIPIF1<0時,函數(shù)的最大值為SKIPIF1<0,因為方程SKIPIF1<0恰有三個互不相等的實數(shù)根,所以函數(shù)SKIPIF1<0的圖象和直線SKIPIF1<0有三個不同的交點,可得SKIPIF1<0的取值范圍是SKIPIF1<0.18.設(shè)函數(shù)的定義域為SKIPIF1<0,如果存在SKIPIF1<0,使得SKIPIF1<0在SKIPIF1<0上的值域也為SKIPIF1<0,則稱SKIPIF1<0為“A佳”函數(shù).已知冪函數(shù)SKIPIF1<0在SKIPIF1<0內(nèi)是單調(diào)增函數(shù).(1)求函數(shù)SKIPIF1<0的解析式.(2)函數(shù)SKIPIF1<0是否為“A佳”函數(shù).若是,請指出所在區(qū)間;若不是,請說明理由.【解析】(1)因為冪函數(shù)SKIPIF1<0在SKIPIF1<0內(nèi)是單調(diào)增函數(shù),所以SKIPIF1<0,解得SKIPIF1<0,所以函數(shù)SKIPIF1<0的解析式為SKIPIF1<0.(2)由(1)知,SKIPIF1<0,函數(shù)的定義域為SKIPIF1<0,又SKIPIF1<0,所以函數(shù)SKIPIF1<0的值域為SKIPIF1<0,因為SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,若存在SKIPIF1<0,使得SKIPIF1<0在SKIPIF1<0上的值域為SKIPIF1<0,則函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,有SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,SKIPIF1<0或SKIPIF1<0,顯然SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,即存在SKIPIF1<0,使得SKIPIF1<0在SKIPIF1<0上的值域為SKIPIF1<0,故函數(shù)SKIPIF1<0為“SKIPIF1<0佳”函數(shù).“SKIPIF1<0佳”函數(shù)SKIPIF1<0的區(qū)間為SKIPIF1<0;19.已知函數(shù)SKIPIF1<0,若點SKIPIF1<0在函數(shù)SKIPIF1<0圖像上運動時,對應(yīng)的點SKIPIF1<0在函數(shù)SKIPIF1<0圖像上運動,則稱函數(shù)SKIPIF1<0是函數(shù)SKIPIF1<0的相關(guān)函數(shù).(1)求函數(shù)SKIPIF1<0的解析式;(2)對任意的SKIPIF1<0的圖像總在其相關(guān)函數(shù)圖像的上方,求實數(shù)SKIPIF1<0的取值范圍.【解析】(1)因為函數(shù)SKIPIF1<0,且點SKIPIF1<0在函數(shù)SKIPIF1<0圖像上運動,所以SKIPIF1<0,即SKIPIF1<0,所以函數(shù)SKIPIF1<0的解析式為:SKIPIF1<0.(2)因為對任意的SKIPIF1<0,SKIPIF1<0的圖像總在其相關(guān)函數(shù)圖像的上方,所以當(dāng)SKIPIF1<0時,SKIPIF1<0恒成立,即SKIPIF1<0恒成立,由SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,得SKIPIF1<0,所以在此條件下,即SKIPIF1<0時,SKIPIF1<0恒成立,即SKIPIF1<0恒成立,即SKIPIF1<0恒成立,∴SKIPIF1<0,解得SKIPIF1<0,故實數(shù)SKIPIF1<0的取值范圍為SKIPIF1<0.20.若在定義域內(nèi)存在實數(shù)SKIPIF1<0,使得SKIPIF1<0成立,則稱函數(shù)有“飄移點”SKIPIF1<0.(1)函數(shù)SKIPIF1<0是否有“飄移點”?請說明理由;(2)證明函數(shù)SKIPIF1<0在SKIPIF1<0上有“飄移點”;(3)若函數(shù)SKIPIF1<0在SKIPIF1<0上有“飄移點”,求實數(shù)a的取值范圍.【解析】(1)不存在,理由如下:對于SKIPIF1<0,則SKIPIF1<0,整理得SKIPIF1<0,∵SKIPIF1<0,則該方程無解,∴函數(shù)SKIPIF1<0不存在“飄移點”.(2)對于SKIPIF1<0,則SKIPIF1<0,整理得SKIPIF1<0,∵SKIPIF1<0在SKIPIF1<0內(nèi)連續(xù)不斷,且SKIPIF1<0,∴SKIPIF1<0在SKIPIF1<0內(nèi)存在零點,則方程SKIPIF1<0在SKIPIF1<0內(nèi)存在實根,故函數(shù)SKIPIF1<0在SKIPIF1<0上有“飄移點”.(3)對于SKIPIF1<0,則SKIPIF1<0,即SKIPIF1<0,∵SKIPIF1<0,則SKIPIF1<0,令SKIPIF1<0,則SKIPIF1<0,∴SKIPIF1<0,又∵SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0,即SKIPIF1<0時等號成立,則SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,即SKIPIF1<0,故實數(shù)a的取值范圍為SKIPIF1<0.21.設(shè)的數(shù)的定義域為SKIPIF1<0,若存在正實數(shù)SKIPIF1<0,使得對于任意SKIPIF1<0,總有SKIPIF1<0,且SKIPIF1<0,則稱SKIPIF1<0是SKIPIF1<0上的“SKIPIF1<0距增函數(shù)”.(1)判斷函數(shù)SKIPIF1<0是否為SKIPIF1<0上的“1距增函數(shù)”并說明理由;(2)已知SKIPIF1<0是定義在R上的奇函數(shù),且當(dāng)x>0時,SKIPIF1<0.若SKIPIF1<0為R上的“2022距增函數(shù)”,求SKIPIF1<0的取值范圍.【解析】(1)對任意SKIPIF1<0,都有S
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