名校
1 . 如图,多面体ABCDE中,四边形ABED是直角梯形,∠BAD=90°,DE∥AB,△ACD是的正三角形,CD=AB=
DE=1,BC=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/d89e000f-a5b7-41ba-9631-e0638fd483ee.png?resizew=170)
(1)求证:△CDE是直角三角形
(2) F是CE的中点,证明:BF⊥平面CDE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/d89e000f-a5b7-41ba-9631-e0638fd483ee.png?resizew=170)
(1)求证:△CDE是直角三角形
(2) F是CE的中点,证明:BF⊥平面CDE
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2019-01-02更新
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234次组卷
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2卷引用:【全国百强校】湖南省衡阳市第一中学2018-2019学年高一上学期六科联赛数学试题
2 . 在四面体ABCD中,过棱AB的上一点E作平行于AD,BC的平面分别交四面体的棱BD,DC,CA于点F,G,H
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/0eac358e-d7aa-4e75-b4fd-cbe363f87349.png?resizew=152)
(1)求证:截面EFGH为平行四边形
(2)若P、Q在线段BD、AC上,
,且P、F不重合,证明:PQ∥截面EFGH
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/0eac358e-d7aa-4e75-b4fd-cbe363f87349.png?resizew=152)
(1)求证:截面EFGH为平行四边形
(2)若P、Q在线段BD、AC上,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7071b5ecb076a09f8d128c58f01220ee.png)
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3 . 如图,以
的两边
分别向外作等边
和等边
,
与
交于点P,已知
.
![](https://img.xkw.com/dksih/QBM/2024/1/22/3416677041340416/3419628471492608/STEM/2813bd9be9c047ab9beded363954ed75.png?resizew=156)
(1)求证:
;
(2)求
的度数及
的长;
(3)若点Q、R分别是等边
和等边
的重心(三边中线的交点),连接
,作出图象,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97898c0102c6bc620abb5ab7442550bf.png)
![](https://img.xkw.com/dksih/QBM/2024/1/22/3416677041340416/3419628471492608/STEM/2813bd9be9c047ab9beded363954ed75.png?resizew=156)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3ccd24d1cdb7db9844a4c20c62970a2.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add18fdf2049abff08a687b950f1cc1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)若点Q、R分别是等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1168cd6865542e2a2efe6f6f21caa214.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7b816eca15d4b7d060013df53edd53.png)
您最近一年使用:0次
名校
解题方法
4 . 各项不为0的数列
满足
,且
.
(1)求证:数列
为等差数列;
(2)若
对任意
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea57eca4b72f73d23c3fed1bc61b414a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/562bf10d55724c77204c6953c7fbf7e2.png)
(1)求证:数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41cf1da18d91f7c98086553d157d1a87.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8355941ad1ce719c3164c1c39bd5b448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a37a59558292ad6b3d0978bfd7484990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2023-03-03更新
|
1657次组卷
|
5卷引用:湖南省湘西州吉首市2023年第二届中小学生教师解题大赛数学试题
名校
5 . 如图,在长方体
中,点
是长方形
内一点,
是二面角
的平面角.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/dc1121ac-bf2b-4566-bfe4-e7b274bd0bfe.png?resizew=145)
(1)证明:点
在
上;
(2)若
,求直线
与平面
所成角的正弦的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faca02f63c357b509c20f0843ec9f021.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/12/dc1121ac-bf2b-4566-bfe4-e7b274bd0bfe.png?resizew=145)
(1)证明:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2023-04-10更新
|
969次组卷
|
6卷引用:湖南省湘西州吉首市2023年第二届中小学生教师解题大赛数学试题
湖南省湘西州吉首市2023年第二届中小学生教师解题大赛数学试题湖南省长沙市第一中学2023届高三下学期月考(八)数学试题吉林省白山市抚松县第一中学2023届高三第十次模拟预测数学试题(已下线)第08讲 拓展二:直线与平面所成角的传统法与向量法(含探索性问题)(6类热点题型讲练)(已下线)第5讲:立体几何中的动态问题【练】(已下线)重难点01 利用基本不等式求最值【八大题型】
名校
解题方法
6 . 设A,B是椭圆
上异于
的两点,且直线AB经过坐标原点,直线PA,PB分别交直线
于C,D两点.
(1)求证:直线PA,AB,PB的斜率成等差数列;
(2)求
面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271e595c257e4c0ade90a9bbbf0e6b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1b6f209d1a805437046ca6ef79dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/501a6d50c937729c8d0f02b2b62a0ee4.png)
(1)求证:直线PA,AB,PB的斜率成等差数列;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
您最近一年使用:0次
2023-01-10更新
|
2310次组卷
|
9卷引用:湖南省湘西州吉首市2023年第二届中小学生教师解题大赛数学试题
湖南省湘西州吉首市2023年第二届中小学生教师解题大赛数学试题湖南省长沙市2023届高三上学期新高考适应性考试数学试题(已下线)模块十二 解析几何-2江西省鹰潭市贵溪市第一中学2022-2023学年高二下学期3月第二次月考数学试题专题20平面解析几何(解答题)2023届四川省名校联考高考仿真测试(三)文科数学试题2023届四川省名校联考高考仿真测试(三)理科数学试题(已下线)第6讲:最值范围问题【练】(已下线)第5讲:定点、定值、定直线问题【练】
名校
解题方法
7 . 已知函数
,
,其中
是自然对数的底数.
(1)当
,
,求
的取值范围;
(2)当
时,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90174f293458307a9614c6b48e703d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041a7c8fc017f596542c5e6ec7d1c40b.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c73a98c1b3504e09bfbe0db849b0d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882d6bd0e780aa28e2dbeca537dd3e68.png)
您最近一年使用:0次
2022-02-08更新
|
1590次组卷
|
4卷引用:湖南省湘西州吉首市2023年第二届中小学生教师解题大赛数学试题
名校
8 . 已知函数
的定义域为区间D,若对于给定的非零实数m,存在
,使得
,则称函数
在区间D上具有性质
.
(1)判断函数
在区间
上是否具有性质
,并说明理由;
(2)若函数
在区间
上具有性质
,求n的取值范围;
(3)已知函数
的图像是连续不断的曲线,且
,求证:函数
在区间
上具有性质
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca2452e9315b65152f13e0b85edab77a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/834925e383a1e904951eea76b55bcb4f.png)
(1)判断函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b1c079afd1b058adc67a50f48f3d466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d9459134e886dc7fb76a0221dbadb1.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7f9b35017daa8b524c5717a355834a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ab9894fcb4fc5e7834839cb05f12d14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9e245dc2e7774139376973a60f97f6.png)
(3)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9c518d889fe12a5d73ad829bb36e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb87c830a03204a5b783ad4c2ba49c4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf5f2b93641d1f16b86d3c1fd398ab7f.png)
您最近一年使用:0次
2021-12-25更新
|
1948次组卷
|
6卷引用:湖南省株洲市第二中学2024年第四届“同济大学”杯数理化联赛高一数学试题
湖南省株洲市第二中学2024年第四届“同济大学”杯数理化联赛高一数学试题上海市嘉定区2022届高三一模数学试题(已下线)热点13 函数的图象与性质-2022年高考数学【热点·重点·难点】专练(全国通用)(已下线)专题06 三角函数(模拟练)-2上海市洋泾中学2022-2023学年高一下学期期中数学试题北京市西城区北京师范大学附属实验中学2022-2023学年高一下学期期中考试数学试题
名校
解题方法
9 . 如图,圆台上底面圆
半径为1,下底面圆
半径为
为圆台下底面的一条直径,圆
上点
满足
是圆台上底面的一条半径,点
在平面
的同侧,且
.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966573292437504/2968469579579392/STEM/259d8c83-f08f-4c4b-9aef-f05e35c1d544.png?resizew=163)
(1)证明:平面
平面
;
(2)若圆台的高为2,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/838a424964c2e96bb8e8dfc27a062b1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46827c30d924e9a7fc8d627515e4c5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfaa712e64750e3e2843bae68ebad6d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3da630440d6d416f19ee22c8431c882.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b658c6aaa010f64b703a97b3fc7db187.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966573292437504/2968469579579392/STEM/259d8c83-f08f-4c4b-9aef-f05e35c1d544.png?resizew=163)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)若圆台的高为2,求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cee51552e3c12bc27cf8ab1777bf191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
您最近一年使用:0次
2022-04-29更新
|
2924次组卷
|
9卷引用:湖南省湘西州吉首市2022年第一届中小学生教师解题大赛数学试题
2001高三·湖南·竞赛
10 . 边长为1的菱形
的两对角线交于
,过
作A2B2∥A1B1交
于
连结
交
于
,过
作A3B3∥A1B1交
于
,…,这样作下去得
以
为原点,
所在直线为
轴,建立平面直角坐标系,设以
为半径,圆心在
,轴上的一列圆
依次相外切(即
与
外切,
),若圆T1与抛物线
相切.求证:所有的圆
都与抛物线
相切.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb04914c4e8fb3483da44c67fe1809f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e1bca493e452800f697c5c640b4aa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2857fac4963b129d99e79dcb3e13d295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374cb268ffa23fc0bf12c6e6dc873c4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd95334c0f28db6ab76e6e6a3df88bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1297f1f7cbc86fe8ce78115bbce249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a996c4e29bcc381353e072eb04c11b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9714efed34e3ccc08351e915b64df80e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd310f7760a862ab1938e5d97eeac97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344ccbf79da6ad7e3709d6fa72efb756.png)
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