解题方法
1 . 设
为函数
的导函数,若
为函数
的极值点,则
为曲线
的拐点,亦称函数
的拐点.已知函数
.
(1)当
时,求曲线
在点
处的切线方程;
(2)求函数
的极值;
(3)当
时,证明:函数
的两个极值和拐点纵坐标可构成等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85be63b7da7f1174c96176de8d1ecc9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544f91d4fb22c571db9f8481b72a0419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85be63b7da7f1174c96176de8d1ecc9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ce95d0450bc59111b516c56586cb78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661249bf6499017f9e5e03db3fcd93d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/544f91d4fb22c571db9f8481b72a0419.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77f881fc240da438a1c12f0f8f7bbb3d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d494dd08ea05abf7e99261b6f05efc47.png)
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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解题方法
2 . 设
为正整数,数列
是公差不为
的等差数列,若从中删去两项
和
后剩余的
项可被平均分为
组,且每组的
个数都能构成等差数列,则称数列
是
可分数列.从
中一次任取两个数
和
,记数列
是
可分数列的概率为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/388e370ba2902078d8d62a373663a0e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a272adba0f1120109824440f0e252c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0616dca5cf0229b9f801365cc2bcfff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/215422dec0e447b0a36d7e198538039c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/388e370ba2902078d8d62a373663a0e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa768d0bb9bcf827b3e7310e35ef0fbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9b41a874fe77c5bab86d8f03668d68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4879d8e0ea9a1eca0bfa2e1ea8b87e88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/388e370ba2902078d8d62a373663a0e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa768d0bb9bcf827b3e7310e35ef0fbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb9b392b1c516e66242727dd9c055f5.png)
A.数列![]() ![]() |
B.数列![]() ![]() |
C.![]() |
D.![]() |
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名校
解题方法
3 . 当
均为正数时,称
为
的“均倒数”.已知数列
的各项均为正数,且其前
项的“均倒数”为
.
(1)试求数列
的通项公式;
(2)设
,试判断并说明
的符号;
(3)已知
,记数列
的前
项和为
,试求
的值;
(4)设函数
,是否存在最大的实数
,使得当
时,对于一切正整数
,都有
恒成立?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d9cf284a6d151f05fc8fe80d36c4b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ed7720846d6a7b71965ee5e1e347513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d9cf284a6d151f05fc8fe80d36c4b1.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/c72975772820e2660bf223a088d80116.png)
(1)试求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f873ccb064468a69720f95a78e04dba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9898911cfd73ac9dcaa544cd82db3d.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2e5998f8375e3e2d3e1d9cf46b7f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.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/d31117a0c8996669b89bc99c4593ae28.png)
(4)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b0f3c580b877ef7bd43c0c12be9bc47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ae78e7e7193c62ea9a195e3af6eebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6acb0f1ac694dd177e99fc385f23318.png)
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4 . 已知数列
前
项和为
,
,则下列结论成立的有( )
![](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/c49dca485ba0c5d61aa77c3d6a14ff69.png)
A.数列![]() |
B.数列![]() |
C.若![]() ![]() |
D.若![]() ![]() |
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解题方法
5 . 已知数列
为等差数列,
,其前
项和为
,数列
满足:
.
(1)求证:数列
为等差数列;
(2)试探究数列
中是否存在三项构成等比数列?若存在,请求出这三项;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb0ffc3208c37f738dc95e020bf68d2.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/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c4867dfd2b1fa71e386275fe0fed234.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
(2)试探究数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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名校
解题方法
6 . 下列说法正确的是( )
A.已知等比数列![]() ![]() ![]() |
B.数列![]() ![]() ![]() ![]() |
C.设![]() ![]() ![]() |
D.设![]() ![]() |
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7 . 现有
枚游戏币
,游戏币
是有偏向的,向上抛出后,它落下时正面朝上的概率为
.甲、乙利用这
枚游戏币玩游戏.
(1)将
这3枚游戏币向上抛出,记落下时正面朝上的个数为
,求
的分布列;
(2)将这
枚游戏币向上抛出,规定若落下时正面朝上的个数为奇数,则甲获胜,否则乙获胜,请判断这个游戏规则是否公平,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d191b41fefb7d71baa0f3b61279414ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1062b6138144f79f9fc920bd87715048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f49dc354c1588ef3d1528c88a7559886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a809ca7fdd64561639655b464bdbc1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
(2)将这
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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8 . 已知等差数列
的公差
,其前n项和为
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812be9806122241c476ba1db516c4823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
A.![]() | B.若![]() ![]() |
C.![]() ![]() ![]() | D.若![]() ![]() ![]() |
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2024高三·全国·专题练习
解题方法
9 . 记数列
的前
项和为
,已知
.证明:
.
![](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/c437dc687ac4d6e319a4552e89f4806c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d716ccbf4313122355c270fe2e67b5.png)
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