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首项为-24的等差数列,从第10项起开始为正数,则公差的取值范围是( ) A. ...
首项为-24的等差数列,从第10项起开始为正数,则公差的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230505040699865/SYS201311012305050406998008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230505040699865/SYS201311012305050406998008_ST/1.png)
≤d≤3
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230505040699865/SYS201311012305050406998008_ST/2.png)
≤d<3
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230505040699865/SYS201311012305050406998008_ST/3.png)
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各项都是正数的等比数列{a
n}中,a
2,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230505040699865/SYS201311012305050406998004_ST/0.png)
a
3,a
1成等差数列,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230505040699865/SYS201311012305050406998004_ST/1.png)
的值是( )
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230505040699865/SYS201311012305050406998004_ST/3.png)
C.
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D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230505040699865/SYS201311012305050406998004_ST/5.png)
或
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数列{a
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n=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101230505040699865/SYS201311012305050406998003_ST/0.png)
,则该数列的前( )项之和等于9.
A.98
B.99
C.96
D.97
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