满分5 >
高中数学试题 >
抛掷一枚骰子,当它每次落地时,向上的点数称为该次抛掷的点数,可随机出现1到6点中...
抛掷一枚骰子,当它每次落地时,向上的点数称为该次抛掷的点数,可随机出现1到6点中的任一个结果,连续抛掷三次,将第一次,第二次,第三次抛掷的点数分别记为a,b,c,求长度为a,b,c的三条线段能构成等腰三角形的概率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616011_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616011_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616011_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616011_ST/3.png)
考点分析:
相关试题推荐
已知A,B,P是双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616010_ST/0.png)
上不同的三点,且A,B连线经过坐标原点,若直线PA,PB的斜率乘积
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616010_ST/1.png)
,则该双曲线的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616010_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616010_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616010_ST/4.png)
D.
查看答案
定义在R上的函数f(x)满足:f(x)•f(-x)=1,f(1+x)•f(1-x)=4,当x∈[0,1]时,f(x)的值域为[1,2],a
k=f(x)
minx∈[2k,2k+2](k∈N),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616009_ST/0.png)
=( )
A.1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616009_ST/2.png)
D.
查看答案
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616008_ST/0.png)
(a,b为常数),在R上连续,则a的值是( )
A.2
B.1
C.3
D.4
查看答案
半径为1的球面上有A、B、C三点,其中点A与B、C两点间的球面距离均为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616007_ST/0.png)
,B、C两点间的球面距离均为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616007_ST/1.png)
,则球心到平面ABC的距离为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616007_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616007_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123758580261672/SYS201310251237585802616007_ST/4.png)
D.
查看答案
已知a,b,c,d是实数,且c>d.则“a>b”是“a•c+b•d>b•c+a•d”的( )
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分也不必要条件
查看答案