名校
解题方法
1 . 已知数列
中,
,其前
项的和为
,且满足
(
).
(1)求证:数列
是等差数列;
(2)证明:当
时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.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/a3b39498579d2e0678bd204d9e4afc6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad83668ff336589f82a2cd04db9f9947.png)
(2)证明:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c35fb3cd13fb42176132a19326959c82.png)
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2020-10-03更新
|
826次组卷
|
13卷引用:2015届湖北省襄阳市五中高三5月模拟考试一文科数学试卷
2015届湖北省襄阳市五中高三5月模拟考试一文科数学试卷2015届吉林省长春市普通高中高三质量监测三理科数学试卷2015-2016学年吉林省扶余市一中高二上学期期末考试理科数学试卷2016届陕西省西安市一中高三下学期第一次模拟文科数学试卷2016-2017学年辽宁庄河高中高二10月考文数试卷2018年高考数学(文科)二轮复习 精练:大题-每日一题规范练-第二周河南省六市2018届高三第一次联考(一模)数学(理)试题【全国百强校】宁夏回族自治区银川一中2018届高三第三次模拟考试数学(理)试题【全国百强校】四川省南充高级中学2018届高三考前模拟考试数学(理科)试题(已下线)专题32 数列大题解题模板-2021年高考一轮数学(文)单元复习一遍过(已下线)专题32 数列大题解题模板-2021年高考一轮数学单元复习一遍过(新高考地区专用)2023版 苏教版(2019) 选修第一册 名师精选卷 第十单元 等差数列 B卷湖南师范大学附属中学2022-2023学年高三上学期月考(六)数学试题
名校
2 . (1)设函数
,证明:
;
(2)若实数
满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c89aa6efb3462d15737b33fd18f905e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2608a57caffde627dbf140ca22a2ff8a.png)
(2)若实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a14c388e1e2e5a2ff1ccf6caffbee0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708a59609457ad6c3981aa22543bcc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f98660deced19afff1a713c79a7e84fc.png)
您最近一年使用:0次
2018-05-17更新
|
436次组卷
|
9卷引用:2016届湖北襄阳四中高三六月全真模拟一数学(文)试卷
2016届湖北襄阳四中高三六月全真模拟一数学(文)试卷2015届陕西省宝鸡市九校高三联合检测理科数学试卷2015届陕西省宝鸡市九校高三联合检测文科数学试卷2016届河北省武邑中学高三下3.20周考文科数学试卷2016届福建厦门外国语学校高三5月适应性数学(文)试卷(已下线)2018年5月13日 每周一测——《每日一题》2017-2018学年高二文科数学人教选修4-5【全国百强校】湖南省长沙市湖南师范大学附属中学2019届高三上学期月考(五)数学(文)试题(已下线)2019年4月28日 《每日一题》文数选修4-5-每周一测2020届宁夏六盘山高级中学高三下学期第二次模拟考试数学(理)试题
3 . 用反证法证明命题“已知
为非零实数,且
,
,求证
中至少有两个为正数”时,要做的假设是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e7ef804eeb23618fbf91ead47587f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e80376a90437a9ef6049bbd389a4ff2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2018-06-07更新
|
734次组卷
|
9卷引用:湖北省襄阳市2018-2019学年高二下学期期末数学(理)试题
湖北省襄阳市2018-2019学年高二下学期期末数学(理)试题【全国百强校】广东省中山市第一中学2017-2018学年高二下学期第二次段考数学(理)试题黑龙江省大庆市第十中学2017-2018学年高二下学期第二次月考数学(理)试卷【市级联考】湖南省张家界市2018-2019学年高二第一学期期末联考文科数学试题辽宁省沈阳市东北育才学校2018-2019学年高二下学期期中考试数学(文)试题辽宁省沈阳市重点高中协作校2018-2019学年高二下学期期中数学文科试题陕西省延安市吴起高级中学2019-2020学年高二下学期第一次质量检测数学(文)试题江西省上饶市横峰中学2019-2020学年高二下学期开学考试数学(文)试题广西浦北中学2020-2021学年高二3月月考数学(文)试题
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4 . (1)证明:当
时,
;
(2)若不等式
对任意的正实数
恒成立,求正实数
的取值范围;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7e5b12719915c134ab756cb09f75c1.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a264a7259b8956b59ef9ef37c9af8855.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01a0805acb0016f9851d5d1a49e2b553.png)
您最近一年使用:0次
2017-05-22更新
|
507次组卷
|
3卷引用:湖北省襄阳第四中学2017届高三下学期第一次模拟考试数学(文)试题
5 . 如图,在梯形
中,
∥
,
,
,平面
平面
,四边形
是矩形,
,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/c1ef9ef6d0d24be5acaf0fe6afcde188.png)
(Ⅰ)求证:
平面
;
(Ⅱ)当
为何值时,
∥平面
?证明你的结论;
(Ⅲ)求二面角
的平面角的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/68f5ef31f20a4c379bd10a3fb2b3b0c7.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/6d834b46b8ba429f9eed15cfd1eb8dbc.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/731e4b16edfe4950b4ba9640003d5d6b.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/e62eed1cbd894981acfdc2e5ceefb20c.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/499f825f40334c66981cab494efb74cd.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/d65c720a0c2b44dbb01f476c3d5de217.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/68f5ef31f20a4c379bd10a3fb2b3b0c7.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/28858d1fa3e74f6299c575df9a9b523e.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/6a772d000010479fb81c6d5f013b200d.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/1f4ed11a77fb421e989a852d3b3371ba.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/e1acdbac12c14748ac8bb416865a4eab.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/c1ef9ef6d0d24be5acaf0fe6afcde188.png)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/2641d41d490540b4bab05389115142dd.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/28858d1fa3e74f6299c575df9a9b523e.png)
(Ⅱ)当
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/68636c28fc74406ca34c7967d12a83e7.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/f1aa6ef2b9444e198a0005c40221ec0f.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/7ad087e8e9894940880c88e036f41421.png)
(Ⅲ)求二面角
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/e2071501b19e4315af7a163d7a878aef.png)
您最近一年使用:0次
2016-12-04更新
|
453次组卷
|
2卷引用:2017届湖北襄阳四中高三七月周考二数学(理)试卷
6 . 用分析法证明:.若△ABC的三内角A、B、C成等差数列,求证:
+
=
.
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572795039039488/1572795045396480/STEM/813b892393fa4bedaed06529c133509c.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572795039039488/1572795045396480/STEM/25cd6ff8c078426e86d9e19933eca837.png)
![](https://img.xkw.com/dksih/QBM/2016/6/23/1572795039039488/1572795045396480/STEM/3b55b32cc4344aafb2ce19eb0776a0b7.png)
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名校
7 . 已知函数
.
(1)讨论
的单调性;
(2)当
时,
,数列
满足
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b1e230e2a639bd3906776b3a3a95b7.png)
①比较
,
,1的大小![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5bc2b05dc79b18ecb4ac3f9b5c492d4.png)
②证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72bff54bac5059c875545ce3e26c77f1.png)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b84f079a1b295b84283a6fff4db2d6f.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86723236cb3b3f72ebded27dbf2d3eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/272b44a71d0bec02b3c4f3f05304f942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f35acda33d5be11651364d468bf76e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b1e230e2a639bd3906776b3a3a95b7.png)
①比较
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca65005e00cce34bdb94cebcfe8a1984.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ade86d7c078be8810332c27e0a61ed7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5bc2b05dc79b18ecb4ac3f9b5c492d4.png)
②证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72bff54bac5059c875545ce3e26c77f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5bc2b05dc79b18ecb4ac3f9b5c492d4.png)
您最近一年使用:0次
名校
8 . 如图,在几何体
中,底面
为以AC为斜边的等腰直角三角形.已知平面
平面
,平面
平面
,
平面
,
,
,
为垂足,
,
为垂足.
平面
;
(2)若
,设
为棱
的中点,求当几何体
的体积取最大值时,
与
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78172568aac9805d2ea2d5f742bf80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1c122603b60b6f1a1334ddb56c3fb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba870ac7e456d8daa098c9d52aeccc2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179f83b6490ae006ae5a536bd8b63db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45593f8565f51193d4d7a9037281dbd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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名校
解题方法
9 . 如图,在平行六面体
中,四边形
与四边形
均为菱形,
.
平面
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7775df7ba0dc94c15e9e706194a463f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca60a3321a757633b9f76349ec16540d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191eca2270134573c8e7633c88b1316c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8233f4e1b00649a7a2d872b921dae99.png)
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2024-04-08更新
|
238次组卷
|
2卷引用:湖北省襄阳市第五中学2024届高三第三次适应性测试数学试题
名校
10 . 如图,在四棱锥
中,
,
,底面
是直角梯形,
.
(1)求证:
;
(2)求平面
与平面
的夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7fca40920c70c01c551e83d61e69b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1b638760d907efe836500581da1596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86756f44de592bdb3d29b96eb75c31d2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/67688748-00c3-4473-83dc-38da262af2e4.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4125524caac016727c80d2722c5ba3.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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