名校
1 . 如图,在多面体ABCDE中,平面
平面ABC,
平面ABC,
和
均为正三角形,
,点M为线段CD上一点.
(1)求证:
;
(2)若EM与平面ACD所成角为
,求平面AMB与平面ACD所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17580410bf63dba4fe164265afaac4cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662698361c6b3ddaf0c28a3c87be53e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/458457dbdb76a78f686dcc0d6b222185.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/b5cc4aa3-91ec-4eab-9863-28bbd4577360.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f6b5026f0d684bf35cc3237bcd3ae2f.png)
(2)若EM与平面ACD所成角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
您最近一年使用:0次
2023-05-27更新
|
749次组卷
|
4卷引用:湖北省恩施市第二中学2023届高三适应性考试数学试题
解题方法
2 . 已知椭圆
过点
,左焦点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/19/88986652-d5cc-461c-9ff7-28e38c89be79.png?resizew=169)
(1)求椭圆C的方程;
(2)设直线
与椭圆C交于A,B两点,点M为椭圆C外一点,直线
,
分别与椭圆C交于点C,D(异于点A,B),直线
,
交于点N,求证:直线
的斜率为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/480f004c98a0df86a35a48bc973f0472.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9bece414af7ecb2d796dc8a6f549e1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/19/88986652-d5cc-461c-9ff7-28e38c89be79.png?resizew=169)
(1)求椭圆C的方程;
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87609b100b8d39b52e25ef1bee9b772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解题方法
3 . 已知平行六面体(底面是平行四边形的四棱柱)
的各条棱长均为2,且有
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/aa077cfa-a8b6-41f4-ad0c-57cc7d00cd83.png?resizew=193)
(1)求证:平面
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c11d8367d24d75fd15c774e3ef6d37.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/aa077cfa-a8b6-41f4-ad0c-57cc7d00cd83.png?resizew=193)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0671b4776e142e17a79af5b3f0378ef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cdc08e1c4a04a18d5ecea03393e36d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
您最近一年使用:0次
名校
解题方法
4 . 如图,平行六面体
中,点P在对角线
上,
,平面
平面
.
三点共线;
(2)若四边形
是边长为2的菱形,
,
,求二面角
大小的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f2ff4c165222af48ba96a6014276b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a52848aff08399a36f217356007a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39b70c74a0f397e6e3e6d6f25429360a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d927585a17c2e98ef7d5a9589a26ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
您最近一年使用:0次
2023-04-16更新
|
3147次组卷
|
5卷引用:湖北省武汉市华中师范大学第一附属中学2023届高三高考前素养数学试题
名校
5 . 如图1,在
中,D,E分别为
的中点;O为
的中点,
,
,将
沿
折起到
的位置,使得平面
平面
,如图2,点F是线段
上的一点(不包含端点).
;
(2)若直线
和平面
所成角的正弦值为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0117046e7a37bebe0c7b987a00d2bcb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa2a83fed9bf4cb09d84a980452e346.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b3e7c7845a0ec3cbac709fda131764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e51c4114e94bceb198403c1858b9682.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610038cde1968e0a15792ce77dd0e99f.png)
您最近一年使用:0次
2023-11-27更新
|
1031次组卷
|
6卷引用:湖北省随州市曾都区第一中学2024届高三上学期12月月考数学试题
名校
解题方法
6 . 在平行四边形ABCD中,
,
,
,过D点作
于E,以DE为轴,将
向上翻折使平面
平面BCDE,连接CE,F点为线段CE的中点,Q为线段AC上一点.
(1)证明:
;
(2)若二面角
的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6834ac70927ae08d7d36a1922403c9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1ac2e11788860424508ea9e80cf89d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e13c772461aef1d9d715129636739748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d28c625d7ac6878957facc8274d459c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/28/cf5629b1-8541-4901-b46c-977acf226849.png?resizew=322)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edfe02a5d85618884803e98257922c4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79bbc95a59f754acf111bcba7cd14c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe5e47c1cfe0d419bacbba32851ed71.png)
您最近一年使用:0次
2023-05-26更新
|
925次组卷
|
3卷引用:湖北省武汉市华中师范大学第一附属中学2023届高三下学期5月压轴卷数学试题(一)
名校
解题方法
7 . 已知椭圆
的右顶点为A,左焦点为F,过点F作斜率不为零的直线l交椭圆于
两点,连接
,
分别交直线
于
两点,过点F且垂直于
的直线交直线
于点R.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/66d2811b-202b-4abb-b9e7-939080908ed3.png?resizew=216)
(1)求证:点R为线段
的中点;
(2)记
,
,
的面积分别为
,
,
,试探究:是否存在实数
使得
?若存在,请求出实数
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb4717d7fa6d522090c5e949f650bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051be09b4e835cf68f624541a843018d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/051be09b4e835cf68f624541a843018d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/66d2811b-202b-4abb-b9e7-939080908ed3.png?resizew=216)
(1)求证:点R为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d7bc44c23548b83970d3422817be1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a62d1f44c3ec83f280aa3b76d17b152b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dbdbc43aa8c6cc90d93a6d8010ef07f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9704598bcc28d88271fee9b2b354254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
您最近一年使用:0次
2023-03-09更新
|
2264次组卷
|
5卷引用:湖北省七市(州)2023届高三下学期3月联合统一调研测试数学试题
名校
8 . 如图,在三棱柱
中,
平面
,D,E分别为棱AB,
的中点,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/ce020f37-dca6-4b5f-84e4-c90d525860f5.png?resizew=152)
(1)证明:
平面
;
(2)若三棱锥
的体积为
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25e8fc3dda4f8b45491514b6e22a962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee631002406bf7468e534b647fc918a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/ce020f37-dca6-4b5f-84e4-c90d525860f5.png?resizew=152)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78172568aac9805d2ea2d5f742bf80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b7cd40c9d26ada55e07fa71a4b98be7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f83dbfddc6f98548699ed581e8c8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf462eaaad82d6bc3b460385fd9f0de.png)
您最近一年使用:0次
2023-05-13更新
|
1060次组卷
|
3卷引用:湖北省黄冈市浠水县第一中学2023届高三下学期5月高考仿真模拟数学试题
湖北省黄冈市浠水县第一中学2023届高三下学期5月高考仿真模拟数学试题黑龙江省齐齐哈尔市第八中学校2022-2023学年高一下学期6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【练】
名校
解题方法
9 . 如图,在三棱台
中,
,
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/f314c732-7e6b-4546-bdc8-503c0ebb3807.png?resizew=209)
(1)证明:平面
平面
;
(2)若
,
,
,求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c4340dcffb0783d118a587e5352a2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/f314c732-7e6b-4546-bdc8-503c0ebb3807.png?resizew=209)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a99ef32b30524326ce26f117cd7f5a91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff7cff6f0357c77698b5f915ce1833f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6ceca871d5d223f616d158c52ae1e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d2d2591aee7b818e41c93f58efc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef671ff46a372d5351b8c2f9eb26b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed8c10f56d59217c8c1a650224278b87.png)
您最近一年使用:0次
2023-05-12更新
|
590次组卷
|
2卷引用:湖北省鄂东南省级示范高中教育教学改革联盟学校2023届高三下学期5月模拟联考数学试题
名校
10 . 在三棱柱
中,四边形
是菱形,
,平面
平面
,平面
与平面
的交线为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/4507fe4b-337b-4808-b0ff-7e624d9cac18.png?resizew=152)
(1)证明:
;
(2)已知
上是否存在点
,使
与平面
所成角的正弦值为
?若存在,求
的长度;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce04b35c265cc9c48b60204bd2f718ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/5/4507fe4b-337b-4808-b0ff-7e624d9cac18.png?resizew=152)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3f35646cb29fafd1e1a214b69e4f22d.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cff9064850b9d7837de6e8ed30c092a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
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2023-05-04更新
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3卷引用:湖北省荆门市龙泉中学、荆州中学·、宜昌一中三校2023届高三下学期5月联考数学试题