已知数列
满足
.给出定义:使数列
的前
项和为正整数的
叫做“好数”,则在
内的所有“好数”的和为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea47008558f9b293f49c05517be9895.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55fe1f773ff9470897f2e5e25de016ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77707636638cd40540900577d89dc78.png)
更新时间:2022-03-16 16:02:18
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解题方法
【推荐1】已知函数
.若
,则实数
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2692cf3bd9fd995fc243c693fc1fc53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be65233277643e084c5b6a8651956e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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名校
【推荐2】下列命题中:
①
与
互为反函数,其图象关于
对称;
②函数
的单调递减区间是
;
③当
,且
时,函数
必过定点
;
④已知
,且
,则实数
.
上述命题中的所有正确命题的序号是______ .
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b161347f6a2fcfd9bf0acf1e8a03fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc5bbf1426b9fa7c4d49659797ef34ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a28068770a85b88b42321cd71ecd3c9.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c400a615a16a1662de98dfb4e49d58d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad1cad1a9380408888c394b78e89000.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d483dd3a65702ed0cd7df766300d03b3.png)
④已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b2d7c035bcad12ab78c0bb1b22d27e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650e1fbe70fe158d525e096ba2bef858.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb4071dc776c61b5631fb8f49ab01ebe.png)
上述命题中的所有正确命题的序号是
您最近一年使用:0次
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【推荐1】在直角坐标平面内,已知点到
,如果
为正偶数,则向量
的纵坐标(用
表示)为______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5753460667a9fce08a8071b560707ea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e8357aca66622b1a8f256e7beec82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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适中
(0.65)
【推荐2】已知正项数列{an}满足
,若a1=2,则数列{an}的前n项和为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/438dc027f82a29ea0f598e0a7d943c28.png)
您最近一年使用:0次
【推荐1】对于正整数
,设
,如
,对于正整数
和
,当
,
时,设
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1be20dc73b340fe207c48f118145a69.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2c1790b28108fe0298e5ebcca51397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded3f51ac7669fb37fa2483a4a507de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72ac49ab7c8001c209b8611b9ea40d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9ee00921ed3694b3e4d15a953503ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa1f761387af7c17e33ecd8b6f48e2bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1be20dc73b340fe207c48f118145a69.png)
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【推荐2】定义:若数列
满足
,则称该数列为“切线—零点数列”.已知函数
有两个零点1,2,数列
为“切线—零点数列”,设数列
满足
,
,数列
的前
项和为
,则
=_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e25bebdb87f5978d79eca798ca2d362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9b5fb7acdb0270a248f95e6239d2342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea2fdda67d2a98caafce60658a57c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db87ffceab6741bf496f69449cc728d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d92c23c6c2530f80f700d4ca2a8ed113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f422edb72f7e1d5529a5570feb77df.png)
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