满分5 >
高中数学试题 >
正方体ABCD-A1B1C1D1的棱长为2,MN是它的内切球的一条弦(我们把球面...
正方体ABCD-A
1B
1C
1D
1的棱长为2,MN是它的内切球的一条弦(我们把球面上任意两点之间的线段称为球的弦),P为正方体表面上的动点,当弦MN的长度最大时,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524015_ST/0.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524015_ST/1.png)
的取值范围是
.
考点分析:
相关试题推荐
已知等比数列{a
n}中,a
1=3,a
4=81,若数列{b
n}满足b
n=log
3a
n,则数列
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524014_ST/0.png)
的前n项和Sn=
.
查看答案
函数y=f(x)的导数记为f′(x),若f′(x)的导数记为f
(2)(x),f
(2)(x)的导数记为f
(3)(x),….若f(x)=sinx,则f
(2013)(x)=
.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524012_ST/images0.png)
某同学学业水平考试的9科成绩如茎叶图所示,则根据茎叶图可知该同学的平均分为
.
查看答案
已知椭圆C
1:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524011_ST/0.png)
和双曲线C
2:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524011_ST/1.png)
有相同的焦点F
1、F
2,2c是它们的共同焦距,且它们的离心率互为倒数,P是它们在第一象限的交点,当cos∠F
1PF
2=60°时,下列结论中正确的是( )
A.c
4+3a
4=4a
2c
2B.3c
4+a
4=4a
2c
2C.c
4+3a
4=6a
2c
2D.3c
4+a
4=6a
2c
2
查看答案
已知函数y=xf′(x)的图象如图所示(其中f′(x)是函数f(x)的导函数),下面四个图象中y=f(x)的图象大致是( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524010_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524010_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524010_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102439535852461/SYS201311031024395358524010_ST/images3.png)
D.
查看答案