定义:
(
)为
个正数
,
,…,
的“均倒数”.若数列
的前
项的“均倒数”为
,则数列
的通项公式为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a84188aad8aca6b9d0ebc335348387.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](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/6347c5d41a0ceb052eb8cacf8f9f8a77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
A.![]() | B.![]() | C.![]() | D.![]() |
22-23高二上·陕西西安·阶段练习 查看更多[3]
更新时间:2022-11-24 18:59:36
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解题方法
【推荐1】正项数列{an}的前n项和为Sn,且满足an2=2Sn-n,则a5=( )
A.8 | B.7 | C.6 | D.5 |
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【推荐2】数列
的前
项和
,若
,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/a74e7c0a00fbe9256c26039cbed0bb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7996f6baa91cb05f360af20062b58d17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb37ff31fab7b1e06e6e960cbcb1f73f.png)
A.2 | B.5 | C.![]() | D.10 |
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【推荐1】定义:若
(
为常数),则称
为“比等差数列”.已知在“比等差数列”
中,
,则
的末位数字是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a3871f856cd942afc1057a8e1e35ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0492549cf2a486a3a9fe875f2f68ec39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee7decc842785858be5763201c395b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b723b219150fe771dbca790f4709ff.png)
A.0 | B.2 | C.4 | D.6 |
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【推荐2】将正整数12分解成两个正整数的乘积有
三种,其中
是这三种分解中两数差的绝对值最小的,我们称
为12的最佳分解.当
是正整数n的最佳分解时,我们定义函数
,例如
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446ca8039ed3cc70424063ffbb54e2b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085a73c2b8fb60fa810642040b599a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085a73c2b8fb60fa810642040b599a5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4666ea1c73e335fb841ee0f8941a23cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0055badaede08dd18ac3018d6e42fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67fa4be9f4c5d7e0241be707819869e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134bd714040110500695515e3529663a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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