1 . “工艺折纸”是一种把纸张折成各种不同形状物品的艺术活动,在我国源远流长.某些折纸活动蕴含丰富的数学知识,例如:如图用一张圆形纸片,按如下步骤折纸:
步骤1:设圆心是
,在圆内异于圆心处取一定点,记为
;
步骤2:把纸片折叠,使圆周正好通过点
(即折叠后图中的点
与点
重合);
步骤3:把纸片展开,并留下一道折痕,记折痕与
的交点为
;
步骤4:不停重复步骤2和3,就能得到越来越多的折痕.
现取半径为4的圆形纸片,设点
到圆心
的距离为
,按上述方法折纸.以线段
的中点为原点,线段
所在直线为
轴建立平面直角坐标系
,记动点
的轨迹为曲线
.
的方程;
(2)设轨迹
与
轴从左到右的交点为点
,
,
为直线
上的一动点(点
不在
轴上),连接
交椭圆于
点,连接
并延长交椭圆于
点.是否存在
,使得
成立?若存在,求出
的值;若不存在,说明理由.
步骤1:设圆心是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
步骤2:把纸片折叠,使圆周正好通过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
步骤3:把纸片展开,并留下一道折痕,记折痕与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
步骤4:不停重复步骤2和3,就能得到越来越多的折痕.
现取半径为4的圆形纸片,设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设轨迹
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495bb3e5a3a9d35f5c9f0cf1f5d51876.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf702adb116c1e46569eb7050d029f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e09d610afe0366d64f2f32a09da21f6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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名校
2 . 抛物线
与椭圆
有相同的焦点,
分别是椭圆的上、下焦点,P是椭圆上的任一点,I是
的内心,
交y轴于M,且
,点
是抛物线上在第一象限的点,且在该点处的切线与x轴的交点为
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16231e127f8a00b343c1986f65f0ab56.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8516f71467b419293fa27df70bdaed74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/332f0dc7afc21adbab48acae2eaf875b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d776753746914c2410a3946c357f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede935419d69a161bb22fd513647da06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3900190c901795456d20b1939916dafd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc675d3c35af2425ec134743250ceae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c153922d3e1fec7dcb99c1713459547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57aa9c9b0ab417c0b952809669f6161b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16231e127f8a00b343c1986f65f0ab56.png)
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2024-02-27更新
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5卷引用:重庆市开州中学2024届高三下学期高考模拟考试(二)数学试题
名校
解题方法
3 . 已知平面向量
,
,
,
,则
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/552355ddba8eef1ca3bf15eb53d79622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdd98836819f79b76830bf1491df66ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d01405df737543c3dc9aa12af68ef66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48f8ed9c671272a6ccf2a798f03d99a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/290a7d4f885a20899a76526b46dd439b.png)
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名校
解题方法
4 . 已知椭圆
的左、右焦点分别为
、
,经过
的直线交椭圆于
,
,
的内切圆的圆心为
,若
,则该椭圆的离心率是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5eb2485f90dbfd0dfd6e7d179a856f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b582ffa8c44cb9d41aec8b8cc7f7b5d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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26卷引用:陕西省西北工业大学附属中学2022届高三下学期第十三次适应性训练理科数学试题
陕西省西北工业大学附属中学2022届高三下学期第十三次适应性训练理科数学试题(已下线)考点8-2 椭圆及其性质(文理)(已下线)专题15 圆锥曲线焦点三角形 微点3 圆锥曲线焦点三角形内切圆问题湖南省长沙市长郡中学2022-2023学年高二上学期第一次月考数学试题(已下线)专题38 椭圆及其性质-4四川省树德中学(宁夏街校区)2022-2023学年高三上学期10月阶段性测试数学(文)试题(已下线)专题28 轻松搞定圆锥曲线离心率十九大模型-2(已下线)专题9-3 求椭圆双曲线离心率题型归类-2江西省上饶市第四中学2022-2023学年高二上学期第三次月考数学试题(已下线)第14讲 椭圆离心率6种常考题型-【同步题型讲义】2022-2023学年高二数学同步教学题型讲义(人教A版2019选择性必修第一册)四川省蓬溪中学校2022-2023学年高二下学期第二次质量检测数学(理)试题四川省蓬溪中学校2022-2023学年高二下学期第二次质量检测数学(文)试题黑龙江省哈尔滨市兆麟中学2023-2024学年高二上学期期中考试数学试题(已下线)四川省成都市第七中学2023-2024学年高二上学期12月月考数学试题广东省广州市广东实验中学2024届高三上学期第二次调研数学试题(已下线)圆锥 曲线2024届高三新改革适应性模拟训练数学试卷七(九省联考题型)辽宁省名校联盟2023-2024学年高二下学期4月联合考试数学试卷浙江省杭州第二中学2023-2024学年高二下学期期中考试数学试题浙江省名校协作体2022-2023学年高三上学期适应性联合考试数学试题江苏省盐城市第一中学2022-2023学年高二上学期第二次学情调研考试数学试题山东省枣庄市滕州市2022-2023学年高二上学期期末数学试题新疆维吾尔自治区阿克苏地库车市第二中学2023-2024学年高二上学期第二次月考(12月)数学山东省青岛第二中学2023-2024学年高二下学期3月月考数学试卷浙江省宁波市鄞州中学2023-2024学年高二上学期期中考试数学试题浙江省宁波市鄞州中学2023-2024学年高二上学期9月月考数学试题
解题方法
5 . 如图,已知椭圆
的左焦点为
,点
是椭圆
上位于第一象限的点,M,N是
轴上的两个动点(点
位于
轴上方),满足
且
,线段PN交
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/783e5113-9c5d-4421-8ac8-e1e04ede1448.png?resizew=187)
(1)若
,求点
的坐标;
(2)若四边形
为矩形,求点
的坐标;
(3)求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279cefeb5c389a37a71e5fd3925f5954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3835e6398d18d162afebc92cd2ae9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce222d674159a5227460d34154d0c4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/783e5113-9c5d-4421-8ac8-e1e04ede1448.png?resizew=187)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d873050cd1473a6e8b92ff15da4dc031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51504dfdb80515cfaf47135c553f3ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99536bbe0ccc335b60ff89a0eeb7d5af.png)
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6 . 如图所示,在平面直角坐标系中,椭圆
:
的左、右焦点分别为
,
,设
是第一象限内
上一点,
,
的延长线分别交
于点
,
.
(1)求
的周长;
(2)设
,
分别为
,
的内切圆半径,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/271e595c257e4c0ade90a9bbbf0e6b0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0739793f234f8e86adc6177801ae7295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a86380a6d6501f6504dcb4aa5e3099f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae863e7a1f1fed09f1075de4a817c63.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/cce594db-9bbe-4a94-8d62-d6d6eb59b659.png?resizew=199)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7733784336d1592cfe38e6a629140ef0.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7733784336d1592cfe38e6a629140ef0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f01d20fc53563351369c9bcb1360c410.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37fd3d19b0c8b544d52b897ca30990b4.png)
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4卷引用:理科数学-2022年高考押题预测卷02(全国甲卷)
(已下线)理科数学-2022年高考押题预测卷02(全国甲卷)四川省资阳中学2021-2022学年高二下学期期中考试数学(理科)试题浙江省嘉兴一中2021-2022学年高二上学期期中数学试题浙江省浙南名校联盟2023-2024学年高二上学期10月联考数学试题
7 . 如图,在三棱锥
中,已知
,
,
,
,则三棱锥
的体积的最大值是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d72a007e3c4a134956b0e3fbde5f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81c92924196614f1ad82b92decd9003.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://img.xkw.com/dksih/QBM/2021/1/13/2635329940414464/2635929053708288/STEM/ea1c2c98-bef5-44a8-9796-f8573e6dfc3a.png)
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4卷引用:专题7-2 立体几何压轴小题:角度与动点、体积(讲+练)-2
(已下线)专题7-2 立体几何压轴小题:角度与动点、体积(讲+练)-2(已下线)第二章 立体几何中的计算 专题四 空间体积的计算 微点1 空间图形体积的计算方法【基础版】福建省莆田第十五中学2019-2020学年高一上学期期末考试数学试题江西省永新中学2021-2022学年高二上学期期中考试数学(理)试题
8 . 在三棱锥
中,已知
,
,
,
,则三棱锥ABCD体积的最大值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b81c92924196614f1ad82b92decd9003.png)
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2020-06-08更新
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4卷引用:四川省剑阁中学校2022-2023学年高二下学期第一次质量检测理科数学试题
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9 . 在棱长为2的正方体
中,点
是正方体棱上一点,
.
①若
,则满足条件的点
的个数为______ ;
②若满足
的点
的个数为6,则
的取值范围是______ .
![](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/b6f7aa9a95bb1dc23472b8132472670c.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4338dd5d6ac02dbb9d5069eb98f436d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
②若满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f7aa9a95bb1dc23472b8132472670c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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