1 . 已知函数
,设曲线
在点
处的切线与x轴的交点为
,其中
为正实数.
(1)用
表示
;
(2)求证:对一切正整数n,
的充要条件是
;
(3)若
,记
证明数列
成等比数列,并求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7b0deaff280ebbee0f91be5acd20d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641fec779880f75fa8ee6782f3350402.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edeb4aa8a3ca0261e0161fd7fa8bde97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3282e5fde4ae53fcb1bb072a685304c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3002f56900c2924bfd79fc3865b0a02e.png)
(2)求证:对一切正整数n,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b3c80e774501722f46f97800f1d400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3fd5fd833041ae95d8b7f8d2897e35.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4223bd6ee8f82d59d244371fbcddc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfe65f891c54780bcf1ed6a9f8a0f6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e976c0663fa749ca749f99842d21ca03.png)
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2022-11-23更新
|
1078次组卷
|
3卷引用:2007年普通高等学校招生考试数学(理)试题(四川卷)
名校
解题方法
2 . 设
均为正数,且
,证明:
(Ⅰ)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7613fb1c51504266f1fe0c960f53b812.png)
(Ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd24c686fbaaa68705d654b880481ffe.png)
(Ⅰ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7613fb1c51504266f1fe0c960f53b812.png)
(Ⅱ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df1f97b371ef077973ce6ec37fd25fd2.png)
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2020-08-06更新
|
610次组卷
|
8卷引用:四川省绵阳市江油中学2020-2021学年高三8月第二次考试文科数学试题
四川省绵阳市江油中学2020-2021学年高三8月第二次考试文科数学试题四川省成都市石室中学2023届高三高考冲刺卷(一) 理科数学试题四川省射洪中学校2023届高考适应性考试(一)理科数学试题安徽省淮北市第一中学2020届高三下学期最后一卷数学(文)试题安徽省淮北市第一中学2020届高三下学期最后一卷数学(理)试题(已下线)专题23 不等式选讲-2020年高考数学(文)母题题源解密(全国Ⅰ专版)(已下线)专题23 不等式选讲-2020年高考数学(理)母题题源解密(全国Ⅰ专版)内蒙古自治区呼和浩特市第二中学2022-2023学年高三上学期11月月考数学理科试题
名校
3 . 已知函数f(x)=xlnx-ax2,a∈R.
(1)证明:当1<x<3时,
;
(2)设函数F(x)=|f(x)|(x∈[1,e])有极小值,求a的取值范围.
(1)证明:当1<x<3时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7f197f4390616d2bfdee94fb2f15c4.png)
(2)设函数F(x)=|f(x)|(x∈[1,e])有极小值,求a的取值范围.
您最近一年使用:0次
2020-05-11更新
|
544次组卷
|
2卷引用:2019年全国高中数学联赛四川省预赛
2006高三·四川·竞赛
4 . 如图,在
内取一点P,使
,作
于点D,
于点E.求证:DE的垂直平分线必过BC的中点M.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b1f10e660e2f364038eb8aab17bc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/545e18836bc7fee22f8f813a6f525d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/28e313ee-08ff-418f-baee-493400a5fd0d.png?resizew=163)
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2006高三·四川·竞赛
5 . 已知数列
定义如下:
.
求证:(1)
;
(2)对任意的正整数 n ,都有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4546b288340a9393260ed532171518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56998b528841e7fac5fd0cf58120c606.png)
求证:(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f222fdef3c418af4d72932fad183e9ef.png)
(2)对任意的正整数 n ,都有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45125fec7c0c318eedf331faff786c1b.png)
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6 . 设
是
的
边外的旁切圆,
,
,
分别是
与
,
和
的切点(如图).
![](https://img.xkw.com/dksih/QBM/2018/12/5/2090236281135104/2091849065775104/STEM/8fc982e59fe64cf3903456244c2d56c9.png?resizew=110)
(1)若
与
相交于
,求证:
平分
.
(2)已知
,
,
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2018/12/5/2090236281135104/2091849065775104/STEM/8fc982e59fe64cf3903456244c2d56c9.png?resizew=110)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df81cda12d7601d58b1d9c7c180c4d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46196aec06c25d5c8f9b1d3a8f50a889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404805afe92b11e5e6125f88ec1de580.png)
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7 . 已知:
.求证:
(1)若
,且
,则 ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8f6bf5c2f04c84550957271c5cb115.png)
(2)当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d17e3231e8d07e6f17cca273949d2bbc.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb7961cbe98aac6a5fdee94582c341b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f364bd19eda02fa19a278441b2aa401b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b8f6bf5c2f04c84550957271c5cb115.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e468312d09c6563c9094b710a35a65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eadd42e1f5910bcf2080d46d60db4f91.png)
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8 . 已知双曲线
,设其实轴端点为
,点
是双曲线上不同于
的一个动点,直线
分别与直线
交于
两点.证明:以线段
为直径的圆必经过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c465114dc2665d74246240b1d4d26ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663368000ac90f582d12675aa2d1e832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663368000ac90f582d12675aa2d1e832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606157f8fed8bf59811ce77ba979ed56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfc9cfb1d1c8578ac3566490132bc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bfc9cfb1d1c8578ac3566490132bc7c.png)
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2005高三·四川·竞赛
9 . 某班有20人参加语文、数学考试各一次,考试按10分制评分,即成绩是0到10的整数.考试结果是:(1)没有0分;(2)没有两个同学的语文、数学成绩都相同.我们说“同学
比
的成绩好”是指“同学
的语文、数学成绩都不低于
”.证明:存在三个同学
、
、
,使得同学
比
的成绩好,同学
比
的成绩好.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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