满分5 >
高中数学试题 >
已知f(x)是定义在R上的增函数,函数y=f(x-1)的图象关于点(1,0)对称...
已知f(x)是定义在R上的增函数,函数y=f(x-1)的图象关于点(1,0)对称.若对任意的x,y∈R,不等式f(x2-6x+21)+f(y2-8y)<0恒成立,则当x>3时,x2+y2的取值范围是( )
A.(3,7)
B.(9,25)
C.(13,49)
D.(9,49)
考点分析:
相关试题推荐
函数y=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321005_ST/0.png)
的图象大致为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321005_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321005_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321005_ST/images3.png)
D.
查看答案
方程log
3x=-x+3的解所在的区间是( )
A.(0,1)
B.(1,2)
C.(2,3)
D.(3,+∞)
查看答案
函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321003_ST/0.png)
在(-2,+∞)上为增函数,则a的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321003_ST/1.png)
B.a<-1或
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321003_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321003_ST/3.png)
D.a>-2
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
命题“2x
2-5x-3<0”的一个必要不充分条件是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321001_ST/0.png)
B.-3<x<3
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101006059432134/SYS201311031010060594321001_ST/1.png)
D.0<x<6
查看答案