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在一个袋子中装有分别标注1,2,3,4,5的五个小球,这些小球除标注的数字外完全...
在一个袋子中装有分别标注1,2,3,4,5的五个小球,这些小球除标注的数字外完全相同,现从中随机取出2个小球,则取出小球标注的数字之差的绝对值为2或4的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012009_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012009_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012009_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012009_ST/3.png)
考点分析:
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A.可能发生
B.不可能发生
C.很可能发生
D.必然发生
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M,N是曲线y=πsinx与曲线y=πcosx的两个不同的交点,则|MN|的最小值为( )
A.π
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012007_ST/1.png)
D.2π
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方程为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012006_ST/0.png)
的椭圆左顶点为A,左、右焦点分别为F
1、F
2,D是它短轴上的一个顶点,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012006_ST/1.png)
,则该椭圆的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012006_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012006_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012006_ST/4.png)
D.
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一个骰子,六个面上的数字分别为1,2,3,4,5,6投掷一次,向上面的数字大于3的概率分别是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012005_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012005_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012005_ST/2.png)
D.
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阅读程序框图,其功能是计算数列a
n前n项和的最大值S,则( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023212110589001211/SYS201310232121105890012004_ST/images0.png)
A.a
n=29-2n,S=225
B.a
n=31-2n,S=225
C.a
n=29-2n,S=256
D.a
n=31-2n,S=256
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