满分5 >
高中数学试题 >
设f(x)、g(x)是定义在R上的可导函数,且f′(x)g(x)+f(x)g′(...
设f(x)、g(x)是定义在R上的可导函数,且f′(x)g(x)+f(x)g′(x)<0,则当a<x<b时有( )
A.f(x)g(x)>f(b)g(b)
B.f(x)g(a(x)
C.f(x)g(b)>f(b)g(x)
D.f(x)g(x)>f(a)g(a)
考点分析:
相关试题推荐
函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947005_ST/0.png)
的单调递增区间为( )
A.[]0,1]
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947005_ST/2.png)
D.
查看答案
已知函数f(x)=2
x-2,则函数y=|f(x)|的图象可能是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947004_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947004_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947004_ST/images2.png)
D.
查看答案
在等差数列{a
n}中,a
1=-2008,其前n项和为S
n,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947003_ST/0.png)
,则S
2008的值等于( )
A.-2007
B.-2008
C.2007
D.2008
查看答案
“x(x-5)<0成立”是“|x-1|<4成立”的( )
A.充分而不必要条件
B.必要而不充分条件
C.充分必要条件
D.既不充分也不必要条件
查看答案
若函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947001_ST/0.png)
,则f(log
43)=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947001_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027194797/SYS201311012248570271947001_ST/2.png)
C.3
D.4
查看答案