數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204326508.png)
等比數(shù)列,
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204341443.png)
,
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204357486.png)
,則數(shù)列
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204373575.png)
的前
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204388297.png)
項的和為( )
試題分析:設(shè)等比數(shù)列的公比為q,因為
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204341443.png)
,
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204357486.png)
,所以
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204700571.png)
,所以
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204731468.png)
,所以
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/201408240232047471036.png)
,所以
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824023204763924.png)
,所以
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/201408240232047942397.png)
,所以選C.
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