满分5 >
高中数学试题 >
函数f(x)=3x-log2(-x)的零点所在区间是( ) A. B.(-2,-...
函数f(x)=3
x-log
2(-x)的零点所在区间是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703369294700/SYS201311031017033692947009_ST/0.png)
B.(-2,-1)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703369294700/SYS201311031017033692947009_ST/1.png)
D.(1,2)
考点分析:
相关试题推荐
若方程a
x-x-a+1=0有两个实数解,则a的取值范围是( )
A.(0,2)
B.(0,1)
C.(2,+∞)
D.(0,+∞)
查看答案
设f(x)是定义在R上的一个函数,则函数F(x)=f(x)-f(-x)在R上一定是( )
A.奇函数
B.偶函数
C.既是奇函数又是偶函数
D.非奇非偶函数
查看答案
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703369294700/SYS201311031017033692947006_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703369294700/SYS201311031017033692947006_ST/1.png)
=( )
A.4
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703369294700/SYS201311031017033692947006_ST/2.png)
C.-4
D.-
查看答案
已知函数y=-x
2+4ax在[1,3]是单调递减的,则实数a的取值范围为( )
A.(-∞,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703369294700/SYS201311031017033692947005_ST/0.png)
]
B.(-∞,1)
C.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703369294700/SYS201311031017033692947005_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703369294700/SYS201311031017033692947005_ST/2.png)
]
D.[
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101703369294700/SYS201311031017033692947005_ST/3.png)
,+∞)
查看答案
设f(x)为定义在R上的奇函数,当x≥0时,f(x)=2
x+2x+b(b为常数),则f(-1)=( )
A.-3
B.-1
C.1
D.3
查看答案