1 . “让式子丢掉次数”:伯努利不等式
伯努利不等式(Bernoulli’sInequality),又称贝努利不等式,是高等数学的分析不等式中最常见的一种不等式,由瑞士数学家雅各布·伯努利提出:对实数
,在
时,有不等式
成立;在
时,有不等式
成立.
(1)猜想伯努利不等式等号成立的条件;
(2)当
时,对伯努利不等式进行证明;
(3)考虑对多个变量的不等式问题.已知
是大于
的实数(全部同号),证明
伯努利不等式(Bernoulli’sInequality),又称贝努利不等式,是高等数学的分析不等式中最常见的一种不等式,由瑞士数学家雅各布·伯努利提出:对实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6339f512d6f801fde040ae9677056d98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e62a78f2a44f317b65a4d05f0c76a927.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbb83894d7274b0c36842fa7c51cc466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb986bcbf5c3c17aefc7ac8a1a68b82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267a28b9f6d9e9f5b761a94ca2075bb4.png)
(1)猜想伯努利不等式等号成立的条件;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4360c1b4a506c12bbdce41e73fb74d8.png)
(3)考虑对多个变量的不等式问题.已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/206a6f31229c1b9905aca55c50369c4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c450723559c1574d3a557bfb7e943fd6.png)
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解题方法
2 . 已知函数
.
(1)若
对于任意
恒成立,求a的取值范围;
(2)若函数
的零点按照从大到小的顺序构成数列
,
,证明:
;
(3)对于任意正实数
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/707db95c67bd9bb4ff1f449903d40cbc.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d44ecf9a385b5f3a023a662b2e75a260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48350c9f896c18a64f27867ca81c9be2.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef26e8f565520685e2dc2dca27752db.png)
(3)对于任意正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b4256756f1416ad35f2227a616b7a7.png)
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解题方法
3 . 已知函数
.
(1)当
时,求证:
①当
时,
;
②函数
有唯一极值点;
(2)若曲线
与曲线
在某公共点处的切线重合,则称该切线为
和
的“优切线”.若曲线
与曲线
存在两条互相垂直的“优切线”,求
,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea7f41aa561904f6f2a8e6aaae348855.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f42342632cbd8e9cfbae17b76d94b033.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9e5ea144897b9b7db92726da39648f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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解题方法
4 . 若函数
在定义域内存在两个不同的数
,
,同时满足
,且
在点
,
处的切线斜率相同,则称
为“切合函数”.
(1)证明:
为“切合函数”;
(2)若
为“切合函数”(其中
为自然对数的底数),并设满足条件的两个数为
,
.
(ⅰ)求证:
;
(ⅱ)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf7c745cd02f4620a175cf00ec85e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24a2c53e3b0b1c08803e95419f909d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecaca8409b3f51d22667a14559c58ea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d275fbb3ee5cd1177ca5a2ceecbbef0f.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe0de54dfc96a2291e8d5e56676eabc.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fb46178ba0560d96bd3a05891505b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
(ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c20b8bd265b07dd90690ad4e349c6dc.png)
(ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84cde09c609543feedc2e0c11992b2bd.png)
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江西省赣州市南康中学2024届高三上学期新高考“七省联考”考前数学猜题卷(一)重庆市南开中学校2024届高三上学期第五次质量检测数学试题重庆市沙坪坝区南开中学校2024届高三上学期第五次质量检测数学试题(已下线)微考点2-5 新高考新试卷结构19题压轴题新定义导数试题分类汇编
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解题方法
5 . 设函数
,
.
(1)①当
时,证明:
;
②当
时,求
的值域;
(2)若数列
满足
,
,
,证明:
(
).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df075cd20f79486d88d80ee12fc897d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5883f63cdc68865d41cc935b7b39557d.png)
(1)①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd5cdde751120c6deab563a6f7f8cf05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e9c599e8d420006448905acec2b8234.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ffa28c7f519c1c85c0a3cad23b2e6cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ebb32ddcd84417fc992dad3ccba8894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9645bd4d2002993b90ec6d48f9c04f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adfbda63ad7cfeb044819141f1924598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930bc56406e69b785b37a83d48e36724.png)
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2023·全国·模拟预测
6 . 下列说法中,不正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
7 . 设
,
为实数,且
,函数
(
),直线
.
(1)若直线
与函数
(
)的图像相切,求证:当
取不同值时,切点在一条直线上;
(2)当
时,直线
与函数
有两个不同的交点,交点横坐标分别为
,
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d33da711e50e96568facb18cef27165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abdaac81540034cdd33d79e398776f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d4f20f4d98141613ff5dd7c37b55c3.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d4f20f4d98141613ff5dd7c37b55c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abdaac81540034cdd33d79e398776f23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0ffecb03c47be920254c4ccffa5b222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d4f20f4d98141613ff5dd7c37b55c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e833475230f8ac54eb4677ebbf434515.png)
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8 . 2022年北京冬奥会仪式火种台(如图①)以“承天载物”为设计理念,创意灵感来自中国传统青铜礼器——尊(如图②),造型风格与火炬、火种灯和谐一致.仪式火种台采用了尊的曲线造型,基座沉稳,象征“地载万物”.顶部舒展开阔,寓意着迎接纯洁的奥林匹克火种.祥云纹路由下而上渐化为雪花,象征了“双奥之城”的精神传承.红色丝带飘逸飞舞、环绕向上,与火炬设计和谐统一.红银交映的色彩,象征了传统与现代、科技与激情的融合.现建立如图③所示的平面直角坐标系,设图中仪式火种台外观抽象而来的曲线对应的函数表达式为
.
(1)求函数
的图象在点
处的切线方程;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ad93dc19938b18b0a9a7dcfe3a7bf1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/20/74fa53e3-3998-4d0f-8f9e-266b5d590b43.png?resizew=388)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab8a0cc6504aa4c3a38006f5394b4c2.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714621c52d929e662febee72b9d68351.png)
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9 . 已知函数
.
(1)证明:
;
(2)证明当
时,存在
使
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c939230910c174e4ad4fdee69385c201.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/182bd6466903617a8c512b085ada0934.png)
(2)证明当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6803e06223269e79138ac240d2d2f57f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a67379bd2dab146edcee3bbb90c6d4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac86301730cfbfe75ec0d72e55b9bb1.png)
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10 . 机械制图中经常用到渐开线函数
,其中
的单位为弧度,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee94f26313ed987bcffb2e405cfb308e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
A.![]() |
B.![]() ![]() ![]() ![]() |
C.![]() ![]() ![]() ![]() |
D.当![]() ![]() |
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