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把数列{}的所有项按照从大到小,左大右小的原则写成如图所示的数表,第k行有2k-...
把数列{
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346714736/SYS201311031027473467147015_ST/0.png)
}的所有项按照从大到小,左大右小的原则写成如图所示的数表,第k行有2
k-1个数,第k行的第s个数(从左数起)记为(k,s),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346714736/SYS201311031027473467147015_ST/1.png)
可记为
.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346714736/SYS201311031027473467147015_ST/images2.png)
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346714736/SYS201311031027473467147011_ST/images1.png)
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