1 . 已知数列
的首项
,
是
与
的等差中项.
(1)求证:数列
是等比数列;
(2)证明:
.
![](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/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e2de706dc5f0439b989273a5367f63a.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fa65c121c7b361e141deaeee7a1d67.png)
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2023-10-30更新
|
1957次组卷
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9卷引用:甘肃省部分校2024届高三上学期10月质量检测数学试题
甘肃省部分校2024届高三上学期10月质量检测数学试题黑龙江省百师联盟2024届高三一轮复习联考(二)数学试题(已下线)模块四 专题6 大题分类练(数列)基础夯实练(人教A)四川省宜宾市南溪第一中学校2024届高三上学期一诊考试理科数学模拟试题(已下线)第二篇 “搞定”解答题前3个 专题2 数列解答题【练】高三逆袭之路突破90分黑龙江省佳木斯市三校联考2024届高三上学期第三次调研考试数学试题(已下线)专题10 数列不等式的放缩问题 (7大核心考点)(讲义)(已下线)黄金卷08(已下线)题型18 4类数列综合
2 . 设函数
,
.
(1)若函数
在点
处的切线方程为
,求实数
,
的值;
(2)在(1)的条件下,当
时,求证:
;
(3)证明:对于任意正整数
,不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129961679b50baca31d081dd6af51d34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cfdccf88b4dd13ddcf13373b71c5034.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9f8845aa2b51c460f2d798c9f62fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1a686b80b8f109a929f58c2de7201d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cc4136bd17997e11a7f8abcb19f9018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab42740d8f095b5f7825d14c4c312096.png)
(3)证明:对于任意正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4687ea0588433399fcba64ca5e4857.png)
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2020-12-15更新
|
666次组卷
|
5卷引用:甘肃省兰州市西北师范大学附属中学2021-2022学年高三上学期期中数学试题
名校
解题方法
3 . 设数列
的前n项和为
,且
,
.
(1)求数列
的通项公式:
(2)设数列
的前n项和为
,求证:
为定值;
(3)判断数列
中是否存在三项成等差数列,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8370a173854471a3eb27637993a3d5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/362832fa3d3c13c1eafd565349d66dce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b87635913b4f90a784edd6ef79f2aec.png)
(3)判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf6421b801b00bceab7547d9ed86874e.png)
您最近一年使用:0次
名校
解题方法
4 . 已知,图中直棱柱
的底面是菱形,其中
.又点
分别在棱
上运动,且满足:
,
.
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453970522234880/2453997798014976/STEM/4358c504-ca50-4dc5-b48b-a8ee2b0667d6.png)
(1)求证:
四点共面,并证明
∥平面
.
(2)是否存在点
使得二面角
的余弦值为
?如果存在,求出
的长;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffa102f519d541f2e4d10a8975a41c36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d6dc34b0b71d46a91eb8dd8db01f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360a93b9662f0ab8a69b131497520b53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/626db48efbecf4e318252ba13baff47d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1357d24d53b523a55b3eea7b21fa16f1.png)
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453970522234880/2453997798014976/STEM/4358c504-ca50-4dc5-b48b-a8ee2b0667d6.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d6dc34b0b71d46a91eb8dd8db01f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c51c4a1148587943fe9ba210f6141ee.png)
(2)是否存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e807172fa9eca2416f92f341adc06165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee14db57f0c762aad845cf5b4a243c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
您最近一年使用:0次
2020-05-02更新
|
1266次组卷
|
5卷引用:甘肃省兰州市第一中学2020届高三冲刺模拟考试(三)数学(理)试题
甘肃省兰州市第一中学2020届高三冲刺模拟考试(三)数学(理)试题2020届河南省高三第十次调研考试数学(理)试题江西省分宜中学、玉山一中等九校2019-2020学年高三联合考试数学理科试卷河北省衡水中学2019-2020学年高三下学期第十次调研数学(理)试题(已下线)1.4 空间向量的应用-2021-2022学年高二数学尖子生同步培优题典(人教A版2019选择性必修第一册)
名校
5 . (1)已知实数
,
满足
,
,证明:
.
(2)已知
,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/0b46b185d15ba613130babd63f65982d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53f02665eb63fb929c6593c1e33b82c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6089f1cc30620a274f76d1bf498f7cb.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21bd168df7c0ce6412d4b9909d9bffec.png)
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2019-05-10更新
|
481次组卷
|
2卷引用:【全国百强校】甘肃省天水市第一中学2019届高三下学期第五次模拟考试数学(文)试题
6 . 已知数列
满足
.
(1)证明数列
是等比数列,并求数列
的通项公式;
(2)数列
满足
,
为数列
的前
项和,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56e9503b83ec3fa2939923ae5e4d6902.png)
(1)证明数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8da2e317b095db07efdfa8bea95e3b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2c71bf821df60553783704f41cd6c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d8dc623a9bac29298adee9a51208790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9928e46511e601913619a427ded84a3.png)
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2017-11-13更新
|
469次组卷
|
3卷引用:甘肃省兰州市永登县第一中学2020-2021学年高三上学期期末数学(文)试题
名校
7 . 设数列
的前
项和为
,且
.
(1)求证:数列
为等比数列;
(2)设数列
的前
项和为
,求证:
为定值;
(3)判断数列
中是否存在三项成等差数列,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.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/3ec5876debe2d19fc86125efcf9003d0.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
(2)设数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea49f8a2b98b542b1ebb2ac813346c90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b87635913b4f90a784edd6ef79f2aec.png)
(3)判断数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85849759030b70f4645bc3fdd2721e22.png)
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2017-09-14更新
|
1951次组卷
|
7卷引用:甘肃省兰州市第一中学2020届高三冲刺模拟考试(三)数学(文)试题
甘肃省兰州市第一中学2020届高三冲刺模拟考试(三)数学(文)试题江苏省海安县2018届高三上学期第一次学业质量测试数学试题江苏省徐州市第三中学2017~2018学年度高三第一学期月考(理科)数学试卷(已下线)《2018届优等生百日闯关系列》【江苏版】专题二 第六关 以新定义数列为背景的解答题2020届江苏省南通市如皋中学高三创新班下学期4月模拟考试数学试题江苏省盐城市第一中学2020届高三下学期第一次调研考试数学试题(已下线)第02章+章末复习课(重点练)-2020-2021学年高二数学十分钟同步课堂专练(人教A版必修5)
8 . 选修4-5:不等式选讲
(1)已知实数
满足
,证明:
;
(2)已知
,求证:
-
≥
+
-2.
(1)已知实数
![](https://img.xkw.com/dksih/QBM/2016/3/2/1572510233698304/1572510240079872/STEM/c42133797e144bd798b01c2bcdec893e.png)
![](https://img.xkw.com/dksih/QBM/2016/3/2/1572510233698304/1572510240079872/STEM/1a31445d95db400eb1b539cf279a670d.png)
![](https://img.xkw.com/dksih/QBM/2016/3/2/1572510233698304/1572510240079872/STEM/f22e36bb2d2441ae98abb36308569e68.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eda48853e8bdb7e266370b4e0d5a258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fccd1ef6cb6e28ae7ddc66b7e7bed1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c70fcaa661df4fbcad820b439accda.png)
您最近一年使用:0次
2016-12-04更新
|
726次组卷
|
2卷引用:2016届甘肃省天水市一中高三上学期期末理科数学试卷
2014·北京石景山·一模
名校
解题方法
9 . 给定椭圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5bbb709522dba9425a6b45ee671298.png)
,称圆心在原点
,半径为
的圆是椭圆
的“准圆”.若椭圆
的一个焦点为
,其短轴上的一个端点到
的距离为
.
的方程和其“准圆”方程;
(2)点
是椭圆
的“准圆”上的动点,过点
作椭圆的切线
交“准圆”于点
.
①当点
为“准圆”与
轴正半轴的交点时,求直线
的方程并证明
;
②求证:线段
的长为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5bbb709522dba9425a6b45ee671298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da001dad7941e6c9858637d7b62cec59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c86bc114a286413e3933352392080a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce08b357f11ef44c3e8207ac574422a.png)
②求证:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
2016-12-02更新
|
1800次组卷
|
8卷引用:2014届甘肃省兰州一中高考模拟四理科数学试卷
(已下线)2014届甘肃省兰州一中高考模拟四理科数学试卷(已下线)2014届甘肃省兰州一中高考模拟四文科数学试卷(已下线)2014届北京市石景山区高三一模理科数学试卷河北省衡水中学2017届高三高考猜题卷(一)数学(理)试题山西省大同市第一中学2019-2020学年高三下学期模拟(六)数学(理)试题北京一零一中学2023届高三下学期开学考数学试题(已下线)微专题07 直线与圆锥曲线的相切问题2015-2016学年河北省石家庄一中高二下期中文科数学试卷
名校
解题方法
10 . 已知
,
,
均为正数,且
.
(1)证明:
;
(2)若
,求
,
的值,并比较
,
,
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9d6b8819acd3255b5847b232b22a68.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621f48abde2109af335639d0bfb38560.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e03516bfa3479baee370ac5b4f55dee7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1d2e5599453f8d4c04369bc8f79962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43557b716fa38a8aeca410d7c8ba1909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d377db95a1606ee92ebfd986625fc5.png)
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