解题方法
1 . 已知数列
的首项
,
.
(1)求证:一定存在实数
,使得数列
是等比数列.
(2)是否存在互不相等的正整数
使
成等差数列,且使
成等比数列?如果存在,请给以证明:如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc6545b8eca1c4223ed701a199a85683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b39bb2e4cf2e79372ee9a601bc5edf5.png)
(1)求证:一定存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5d274181bfe47ccdff807746de1eea.png)
(2)是否存在互不相等的正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1990f716ccde7382571f8ae67b5b265e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1990f716ccde7382571f8ae67b5b265e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f1e59d4195173e52ee877dbf17ac473.png)
您最近一年使用:0次
2022-11-05更新
|
469次组卷
|
5卷引用:第4章 数列 单元综合检测-2022-2023学年高二数学《基础·重点·难点 》全面题型高分突破(苏教版2019选择性必修第一册)
(已下线)第4章 数列 单元综合检测-2022-2023学年高二数学《基础·重点·难点 》全面题型高分突破(苏教版2019选择性必修第一册)(已下线)第4章 数列 单元综合检测(练习)-2022-2023学年高二数学同步精品课堂(人教A版2019选择性必修第二册)江苏省苏州市西交大附中高二2022-2023学年10月阶段检测数学试题(已下线)4.3.1 等比数列的概念(第2课时)(分层作业)-【上好课】2022-2023学年高二数学同步备课系列(人教A版2019选择性必修第二册)(已下线)第三节 等比数列 B素养提升卷
2 . 求解下列问题:
(1)证明:
.
(2)已知
,且
.
求证:
.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b2d4fde8bd60bc06204e611775cfeca.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a362d8aedb9d1f31c107157ffe5427e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf43bd907a0590831d324d5eff38ea54.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e730482274601b77dfce72e672b9a934.png)
您最近一年使用:0次
2022-08-15更新
|
323次组卷
|
6卷引用:第4章 指数与对数 单元综合检测-2022-2023学年高一数学《基础·重点·难点 》全面题型高分突破(苏教版2019必修第一册)
第4章 指数与对数 单元综合检测-2022-2023学年高一数学《基础·重点·难点 》全面题型高分突破(苏教版2019必修第一册)2023版 苏教版(2019) 必修第一册 名校名师卷 第五单元 指数与对数(已下线)突破4.3 对数(重难点突破)-【新教材优创】突破满分数学之2022-2023学年高一数学重难点突破+课时训练 (人教A版2019必修第一册)(已下线)专题4.6 对数-重难点题型检测-2022-2023学年高一数学举一反三系列(人教A版2019必修第一册)(已下线)第4章 指数与对数章末题型归纳总结 (1)-【帮课堂】(苏教版2019必修第一册)(已下线)第三章 幂、指数与对数(压轴题专练)-速记·巧练(沪教版2020必修第一册)
解题方法
3 . 如图:正方体ABCD-A1B1C1D1棱长为2,E,F分别为DD1,BB1的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/60878e38-b7e3-4e3a-9c9e-8bd906cfc333.png?resizew=160)
(1)求证:CF//平面A1EC1;
(2)过点D作正方体截面使其与平面A1EC1平行,请给以证明并求出该截面的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/60878e38-b7e3-4e3a-9c9e-8bd906cfc333.png?resizew=160)
(1)求证:CF//平面A1EC1;
(2)过点D作正方体截面使其与平面A1EC1平行,请给以证明并求出该截面的面积.
您最近一年使用:0次
2022-07-14更新
|
1442次组卷
|
6卷引用:第八章 立体几何初步 讲核心 02
(已下线)第八章 立体几何初步 讲核心 02湖南省衡阳市衡南县2021-2022学年高一下学期期末数学试题(A卷)重庆市缙云教育联盟2023届高三上学期8月质量检测数学试题(已下线)第03讲 空间直线、平面的平行 (精讲)-2(已下线)专题08 空间直线与平面的平行问题(1)-期中期末考点大串讲福建省永春第二中学2022-2023学年高一下学期5月月考数学试题
21-22高一·全国·期中
解题方法
4 . 如图所示,在四棱锥
中,底面
是边长为
的正方形,侧面
底面
,且
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974332072411136/2983622606913536/STEM/bbac5408-2b22-47e0-9df9-28a0fa93eee8.png?resizew=181)
(1)求证:
平面
;
(2)在线段
上是否存在一点
,使得平面
平面
?若存在,请说明其位置,并加以证明;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974332072411136/2983622606913536/STEM/bbac5408-2b22-47e0-9df9-28a0fa93eee8.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5394d00a80a5900d7fd7d9961868bd22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
5 . 如图,在四棱锥
中,底面
是边长为
的菱形,
,
为正三角形,
为
的中点,且平面
平面
,
是线段
上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/4b308c9e-cc67-401c-9878-a0681e0cbc09.png?resizew=239)
(1)当点
为线段
的中点时,证明直线
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求证:
;
(3)点
在线段
上,且
,求直线
与平面
的夹角的正弦值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a58a622e2b1a239f2f96aa1501e9799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/4b308c9e-cc67-401c-9878-a0681e0cbc09.png?resizew=239)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280247d7df395bb9ea78c51e67b458d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a89efb10e95245a41f6c7a80189528.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03554a133b17b47a564671a60802d3df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
您最近一年使用:0次
21-22高一下·北京·期末
解题方法
6 . 如图, 在三棱锥
中,已知
是正三角形,
平面
,
,
为
的中点,
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/ab06d698-66d5-46fe-a2e4-642d5fabaf5e.png?resizew=212)
(1)求三棱锥
的体积;
(2)求证:
平面
;
(3)若
为
中点, 是否存在
在棱
上,
,且
平面
? 若存在,求
的值并说明理由;若不存在,给出证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d150134e5018f74fc4e8a016ced5f11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457eb716c608c6b4fb6e91c8fc2ed163.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/3/ab06d698-66d5-46fe-a2e4-642d5fabaf5e.png?resizew=212)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18da88f27cc36dbf1d01bcea7341bc37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf5909a2b109d048bd7c7a0377a769f.png)
您最近一年使用:0次
21-22高一·全国·单元测试
解题方法
7 . 如图所示,在四棱锥
中,底面
是正方形,
是正三角形,平面
平面
,
和
分别是
和
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974447173214208/2988554001809408/STEM/8bc4f736d94f4c14a40f8234fe29d803.png?resizew=205)
(1)求证:
;
(2)求证:平面
平面
;
(3)在
上是否存在点
,使得平面
平面
,若存在求出
点位置,并证明,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974447173214208/2988554001809408/STEM/8bc4f736d94f4c14a40f8234fe29d803.png?resizew=205)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c40dcf1793ca117a2171d93003df1c.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9ab73fd4ddacc0c1524f8d742c7dcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19bf13105c4e14f02053c25252432d9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次
名校
解题方法
8 . 已知数列
的前
项和为
,满足
·
(1)证明:数列
是等比数列,并求数列
的通项公式;
(2)若
,设
是数列
的前
项和,求证:
.
![](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/966f1f9a1f9d9fb19eb5735e1d53c576.png)
(1)证明:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a080c94bf1ffea8d5af10f9688978fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b106d3c1113b9217724bf99d90de3b9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de2746040b593c449081174b3b5e4920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6828a1cf75f19bb74a0e0490bd65c168.png)
您最近一年使用:0次
2022-03-07更新
|
807次组卷
|
3卷引用:人教B版(2019) 选修第三册 名师精选 第五章 数列 B卷
人教B版(2019) 选修第三册 名师精选 第五章 数列 B卷(已下线)卷12 数列章节测试·B卷·能力提升 -【重难点突破】2021-2022学年高二数学名校好题汇编同步测试卷(人教A版选择性必修第二册)黑龙江省牡丹江市第二高级中学2023-2024学年高三上学期第二次阶段性考试数学试题
9 . 用合适的方法证明:
(1)已知
,
都是正数,求证:
.
(2)已知
是整数,
是偶数,求证:
也是偶数.
(1)已知
![](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/2821108f150ed2564cd2d9b55359bfb3.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cc0b4997cae4d8aec791a1d3923314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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10 . 用基本不等式证明不等式
(1)已知a,b,c为不全相等的正实数,求证:
;
(2)已知a,b,c为正实数,且
,求证:
.
(1)已知a,b,c为不全相等的正实数,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f0514c4015765d1b12b76f4df81215.png)
(2)已知a,b,c为正实数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751e274e9107d780c39ba9c49d6daefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17f917a19a15bceb9a3769e59e25dd9c.png)
您最近一年使用:0次
2020-11-04更新
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529次组卷
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5卷引用:北师大版(2019) 必修第一册 名校名师卷 第三单元 不等式