试题分析:令
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824021200721446.png)
,则
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/201408240212007531041.png)
,令
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824021200768365.png)
,
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824021200768410.png)
,又
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/201408240212007841257.png)
,所以
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824021200877591.png)
,所以
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824021200612338.png)
+
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824021200628534.png)
+
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824021200643532.png)
+…+
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824021200659629.png)
![](http://thumb.zyjl.cn/pic2/upload/papers/20140824/20140824021200940875.png)
.选D.
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