解题方法
1 . 如图,在直三棱柱
中,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/a3acc036-e01d-48a6-8ef3-1a66c959410a.jpg?resizew=126)
(1)证明:
平面
;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cf3bff56a7f4ab6c0008e90823025d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289d7a880379d6060065c829b45b0ed6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/29/a3acc036-e01d-48a6-8ef3-1a66c959410a.jpg?resizew=126)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d85c8d87197c9ffad619eb3912e1b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6610370a5aefaf45fdb579521484e3b5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e937690538483bca282ff6831772b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3bdeec91171e6d0c5247f199ffd7c63.png)
您最近一年使用:0次
2018-03-26更新
|
802次组卷
|
4卷引用:2017届河南豫北名校联盟高三文上精英对抗赛数学试卷2
2 . 已知点
为双曲线
上任一点,
为双曲线的右焦点,过
作直线
的垂线,垂足为A,连接
并延长交y轴于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/6eb70376-cd94-4cc1-a517-ee193669a6df.png?resizew=238)
(1)求线段
的中点
的轨迹
的方程;
(2)已知
,过点
的直线l与轨迹E交于不同的两点M、N,设直线DM和直线DN的斜率分别为
和
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15be73296477fc390f8b438cfd52b452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c5fd9b17a0ed5508c11547ea3fbb3e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61d572ecf27dc02fcbd588f24647b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f1b40221f57567c67c1ba5ceb2f57b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfa8bf45e6d2d25a730a793d0cf5694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31889f8671f76ca924c9d86f6fdc929c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910ec9341909c0edd74ee755543c4c35.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/6eb70376-cd94-4cc1-a517-ee193669a6df.png?resizew=238)
(1)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10195cb8bc3cb0db5c76dd15d331a28b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252053b853152bd294a8315debd00b92.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85acf3c73db7fad56a34b1f86f5bdbf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb1b7b68a0fcb11f39395f57cba1c27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2562424a83aae7e4b3f8adf90307961a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b58edb637c5dfa03794f3952de9d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8869f1b1c62e8e88f528a38d6d71968a.png)
您最近一年使用:0次
2022-10-21更新
|
474次组卷
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3卷引用:河南省驻马店市确山县第一高级中学2022-2023学年高二上学期数学竞赛试题
名校
解题方法
3 . 若函数
在定义域内的某区间
上是严格增函数,而
在区间
上是严格减函数,则称函数
在区间
上是“弱增函数”.
(1)判断
,
在区间
上是否是“弱增函数”(不需证明)?
(2)若
(其中常数
,
)在区间
上是“弱增函数”,求
、
应满足的条件;
(3)已知
(
是常数且
),若存在区间
使得
在区间
上是“弱增函数”,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e82cc461b9607e08a8b31597f6d26df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315b1a62ec3efc43575c57a801ad6585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9df515c375a6cd512dafd680a2f8132e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154186900500104502219afe07839158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd9218a657b17654c5d757a6f7dee9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf87d9d48c3de0a5e9f1a70e51a0bef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a29f7f6294171b824722185447384b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2021-12-16更新
|
307次组卷
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3卷引用:河南省驻马店市确山县第一高级中学2022-2023学年高二上学期数学竞赛试题
4 . 2022年北京冬奥会标志性场馆——国家速滑馆的设计理念来源于一个冰和速度结合的创意,沿着外墙面由低到高盘旋而成的“冰丝带”,就像速度滑冰运动员高速滑动时留下的一圈圈风驰电掣的轨迹,冰上划痕成丝带,22条“冰丝带”又象征北京2022年冬奥会.其中“冰丝带”呈现出圆形平面、椭圆形平面、马鞍形双曲面三种造型,这种造型富有动感,体现了冰上运动的速度和激情这三种造型取自于球、椭球、椭圆柱等空间几何体,其设计参数包括曲率、挠率、面积体积等对几何图形的面积、体积计算方法的研究在中国数学史上有过辉煌的成就,如《九章算术》中记录了数学家刘徽提出利用牟合方盖的体积来推导球的体积公式,但由于不能计算牟合方盖的体积并没有得出球的体积计算公式直到200年以后数学家祖冲之、祖暅父子在《缀术》提出祖暅原理:“幂势既同,则积不容异”,才利用牟合方盖的体积推导出球的体积公式原理的意思是:两个等高的几何体若在所有等高处的水平截面的面积相等,则这两个几何体的体积相等.
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694905847365632/2694931074424832/STEM/0a6d9345-1c0e-47c4-bf90-27752a3f020b.png?resizew=342)
(Ⅰ)利用祖暅原理推导半径为
的球的体积公式时,可以构造如图②所示的几何体
,几何体
的底面半径和高都为
,其底面和半球体的底面同在平面
内.设与平面
平行且距离为
的平面
截两个几何体得到两个截面,请在图②中用阴影画出与图①中阴影截面面积相等的图形并给出证明;
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694905847365632/2694931074424832/STEM/b2e64255049a42a7958a1bd0f8f16485.png?resizew=454)
(Ⅱ)现将椭圆
所围成的椭圆面分别绕其长轴、短轴旋转一周后得两个不同的椭球
,
(如图),类比(Ⅰ)中的方法,探究椭球
的体积公式,并写出椭球
,
的体积之比.
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694905847365632/2694931074424832/STEM/0a6d9345-1c0e-47c4-bf90-27752a3f020b.png?resizew=342)
(Ⅰ)利用祖暅原理推导半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69adf40d4d5fd6eb1cab1bbf0a251afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a28be4d5a16cf245f6fa7c4088fee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69adf40d4d5fd6eb1cab1bbf0a251afc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac5e50bf09ceadd1715cd1265b5477a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac5e50bf09ceadd1715cd1265b5477a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcf9f33389b83d32baf2f784435e80f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31f2b4b366c8952e0794f0a627faef3c.png)
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694905847365632/2694931074424832/STEM/b2e64255049a42a7958a1bd0f8f16485.png?resizew=454)
(Ⅱ)现将椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590c1942b83041180e5d96581a024894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671b087abb1d2692c8be5b16846c4690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671b087abb1d2692c8be5b16846c4690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671b087abb1d2692c8be5b16846c4690.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da9dcf6c319174c9ea2b1ceaed1649a.png)
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694905847365632/2694931074424832/STEM/f69f05fe2751439ca0a6b17212b5e3a1.png?resizew=227)
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2021-04-07更新
|
2759次组卷
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12卷引用:河南省驻马店市确山县第一高级中学2022-2023学年高二上学期数学竞赛试题
河南省驻马店市确山县第一高级中学2022-2023学年高二上学期数学竞赛试题河北省石家庄市2021届高三下学期质检一数学试题(已下线)押第19题 立体几何-备战2021年高考数学(文)临考题号押题(全国卷2)(已下线)押第19题 立体几何-备战2021年高考数学(理)临考题号押题(全国卷2)(已下线)专题3.7 椭圆的综合问题-2021年高考数学解答题挑战满分专项训练(新高考地区专用)(已下线)热点01 数学传统文化和实际民生为载体的创新题-2022年高考数学【热点·重点·难点】专练(新高考专用)北京市一零一中学怀柔分校2022届高三高考数学模拟试题(已下线)专题2 立体几何与解析几何(已下线)压轴题立体几何新定义题(九省联考第19题模式)练(已下线)第二章 立体几何中的计算 专题三 空间体积的计算 微点2 祖暅原理及球体积辅助体综合训练【培优版】(已下线)【一题多变】祖暅原理 曲面化直(已下线)第六章 突破立体几何创新问题 专题一 交汇中国古代文化 微点2 与中国古代文化遗产有关的立体几何问题(二)【基础版】
5 . 锐角三角形ABC中,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1753d72942b116096579b05decd2b378.png)
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名校
6 . 如图所示,正三棱柱
的所有棱长都为
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/5d24f6c0-de6b-4d38-ba2e-714aaeec7731.png?resizew=171)
(1)求证:
⊥平面
;
(2)求锐二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/5d24f6c0-de6b-4d38-ba2e-714aaeec7731.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求锐二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f97babc2abb18c1540d3a5504f7cf3fe.png)
您最近一年使用:0次
2019-05-09更新
|
548次组卷
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14卷引用:河南省河大附中09-10高二年级校内竞赛数学试题
河南省河大附中09-10高二年级校内竞赛数学试题(已下线)2011届云南省蒙自高中高三1月月考数学理卷(已下线)2012届辽宁省铁岭高级中学高三上学期第三次月考理科数学试卷(已下线)2012届江苏省扬州市宝应县高三下学期期初测试数学试卷(已下线)2013-2014学年湖南张家界市高二上学期期末联考理科数学试卷【全国市级联考】福建省福州市八县(市)协作校2017-2018学年高二上学期期末联考数学(理)试题【全国校级联考】安徽省皖中地区2019届高三入学摸底考试数学(理科)试题2018-2019人教A版高中数学选修2-1第三章 空间向量与立体几何 模块综合评价【市级联考】浙江省嘉兴市2018-2019学年高二第一学期期末检测数学试题【全国百强校】安徽省铜陵市第一中学2018-2019学年高二下学期期中考试数学(理)试题新疆乌苏市第一中学2021-2022学年高二下学期期中考试数学(理)试题(已下线)广东省广州市第二中学2023届高三综合测试(一)数学试题北京市日坛中学2023-2024学年高二上学期10月月考数学试题(已下线)艺体生一轮复习 第七章 立体几何 第36讲 空间向量在立体几何中的应用【讲】
2004高三·河南·竞赛
7 . 已知在长方体
中,棱长
,
.联结
过点
作
的垂线交
于点
、交
于点
.
(1)求证:
平面
;
(2)设
平面
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa1c07becd03537beeb09a31745cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc416a5b8dc234628e7475387888d82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d2e0f281222a5f289ea4008370aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce3613af55adaa0894a54270d5708e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4c69f05eb698e1f8406ba9a778f67a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dbc6873d8755da83f17db19bf0bc32e.png)
您最近一年使用:0次
8 .
为
内接三角形,
.点
在劣弧
上,从点
分别作
、
的垂线交
于点
、
,射线
、
交于点
.若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4ffc5fb090753d992c22368d8fb318a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8f24da3b1f60754db6f6c33b1a31d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
您最近一年使用:0次
9 . 直线
与双曲线
及其渐近线交于A、B、C、D四点.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b256345d7109e081b7c895591e995d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd1af14f9a53cb0f07d5d28dceba30aa.png)
您最近一年使用:0次
10 . 如图 ,四棱锥
的底面是正方形,
,
, 点
、
分别在棱
、
上,且
.
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096449728692224/2097424263831552/STEM/18707ad889514f18a0c85e54aedf3769.png?resizew=141)
(1)求证 :
;
(2)求二面角
的大小;
(3)求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50569f012f6c1f3cfe0613972328ff0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc516d03b9c1301e38c166cad89e9009.png)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096449728692224/2097424263831552/STEM/18707ad889514f18a0c85e54aedf3769.png?resizew=141)
(1)求证 :
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9110da5b5551c93e312b5ba97cb682cd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8126878fd2a06f3a0dd13decb07e60f8.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1885efcff0b903e314057dd153578600.png)
您最近一年使用:0次