2011高一上·山东泰安·学业考试
1 . 已知等差数列
的公差
,它的第1、5、17项顺次成等比数列,则这个等比数列的公比是___________
![](https://img.xkw.com/dksih/QBM/2011/9/13/1570310888710144/1570310893617152/STEM/df68644c349c4051b4644b236ab9eec0.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2011/9/13/1570310888710144/1570310893617152/STEM/65a6f000ed594886b8bf1ba0bb04b8d3.png?resizew=40)
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2011高一上·山东泰安·学业考试
2 . 给出下列四个命题:
①若a>b>0,则
; ②若a>b>0,则
; ③若a>b>0,则
;
④若a>0,b>0,且a+b=1,则
的最小值为4
其中正确命题的序号是____ .(把你认为正确命题的序号都填上)
①若a>b>0,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8201ff29a2091d40eee10db6bbc1f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a730f248efcbff2abfd3229f00f355c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23e36a495d9347d7ef80a27331c2bf26.png)
④若a>0,b>0,且a+b=1,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f7266b2ef457b8ddeee3fa2cc24022e.png)
其中正确命题的序号是
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2011高一上·山东泰安·学业考试
3 .
中,若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23725094c363fd158166a8698971694c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d62e60396295cd74d03e38978405bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de08e9e977f8997b0a7d351bf338c1fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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