如图,在一个7行8列的数表中,第
行第
列的元素为
,其中
,则该数表中所有无重复的元素之和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a0129115cf2fe6bec24b2e5ad73b0ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e21a2abecb477ad5ff15db0f3d7817f3.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-01-22 05:51:20
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【知识点】 求等比数列前n项和
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【推荐1】设等比数列
的前
项和为
,若
,且
、
、
成等差数列,则
=( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b32aee86109b777671cd62868db3b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e86e2e42b4aa93db9241103e7f61766c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eed39c7d611309b01476c15ab242308.png)
A.510 | B.255 | C.512 | D.256 |
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单选题
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较易
(0.85)
【推荐2】在流行病学中,基本传染数
是指在没有外力介入,同时所有人都没有免疫力的情况下,一个感染者平均传染的人数.假设某种传染病的基本传染数是
,那么感染人数由
个初始感染者经过
轮传染得到感染者(包括初始感染者)的总人数是多少? (初始感染者传染
个人为第一轮传染,这
个人每人再传染
个人为第二轮传染,…)( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9b4a83b9aebebf29de0c4406ebf894.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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