给出定义:若函数f(x)在D上可导,即f′(x)存在,且导函数f′(x)在D上

给出定义:若函数f(x)D上可导,即f′(x)存在,且导函数f′(x)D上也可导,则称函数f(x)D上存在二阶导函数,记f″(x)(f′(x))′.f″(x)<0D上恒成立,则称函数f(x)D上为凸函数,以下四个函数在上不是凸函数的是      (  )

Af(x)sin xcos x                   Bf(x)ln x2x

Cf(x)=-x32x1                Df(x)=-xex          

答案

D

相关题目

电视剧《宰相刘罗锅》里有个军机大臣和珅,号称“贪污之
电视剧《宰相刘罗锅》里有个军机大臣和珅,号称“贪污之王”,他一定给观众留下了深刻的印象。那么,清朝设置的军机处( )     A.发生在顺治
据说明太祖曾经写诗一首描述自己的辛劳:“百僚未起朕先
据说明太祖曾经写诗一首描述自己的辛劳:“百僚未起朕先起,百僚已睡朕未睡。不如江南富足翁,日高丈五犹拥被。”为解决上述问题,明太祖 (  
选用适当的介词填空 1. What do you do ___Sunday?2. I get up ___ 6:10 in
选用适当的介词填空 1. What do you do ___Sunday?2. I get up ___ 6:10 in the morning.3. I sit far ___Li Ming. His seat is not near mine.4. Mr. Black lives ___ my house. You can see his house
. 雍正年间,用兵西北......始设军需房于隆宗门内,选内阁中
. 雍正年间,用兵西北......始设军需房于隆宗门内,选内阁中书之谨密者入直缮写。这说明军机处设置的最初目的是 A.加强中央集权           
George, with _______ I played tennis on Sundays, was a warm-hearted person. A. t
George, with _______ I played tennis on Sundays, was a warm-hearted person. A. that                B. him            C. them                D. whom
已知函数f(x)=x3+3(k-1)x2-k2+1在(0,4)内单调递减, 则k的取值范围是
已知函数f(x)=x3+3(k-1)x2-k2+1在(0,4)内单调递减, 则k的取值范围是 A.(-∞,-1)                B. (-∞,-1]                 C.(1, +∞)      
设集合S={1,2,3,4,5,6,7,8,9},集合A={a1,a2,a3},A⊆S,a1,a2,
设集合S={1,2,3,4,5,6,7,8,9},集合A={a1,a2,a3},A⊆S,a1,a2,a3满足a1<a2<a3且a3-a2≤6,那么满足条件的集合A的个数为( ) A.84  B.83  C.78  D.76
下列化学肥料中属于复合肥的是( ) A.Ca3(PO4)2   B.KCl
下列化学肥料中属于复合肥的是( ) A.Ca3(PO4)2   B.KCl  C.NH4NCO3   D.KNO3

最新题目