1 . 如图,在四棱锥
中,四边形
是菱形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/f3a6b22b-d1a0-40f1-9c9c-6ffb655cd8cd.png?resizew=170)
(1)证明:平面
平面
.
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/917059c4d68de6935b5b010edd3b2efb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/f3a6b22b-d1a0-40f1-9c9c-6ffb655cd8cd.png?resizew=170)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b31c44f920e6e09b02f03ec82ef843.png)
您最近一年使用:0次
2024-03-03更新
|
456次组卷
|
2卷引用:陕西省部分学校2023-2024学年高二下学期开学摸底考试数学试卷
解题方法
2 . 在
中,内角
、
、
的对边分别为
、
、
,已知
,
.
(1)证明:
;
(2)求当
面积取得最大值时,
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52a2150835cfbadcfd17893fe5068b3.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe29c42302504e7fd8577dbc7d130ac7.png)
(2)求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
3 . 如图,在棱长为2的正方体
中,点
是棱
上的动点.
;
(2)若点
是棱
的中点,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b30478b45ea023eb5d23805aadf709.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dee31a4af85968dc63bd86a779a77d34.png)
您最近一年使用:0次
2024-02-12更新
|
191次组卷
|
2卷引用:上海市新川中学2023-2024学年高二上学期期末数学试题
名校
4 . 如图,四边形
为梯形,
,四边形
为矩形,
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/9/e05d4ffe-b1ee-4b17-a069-da3f1b1954ae.png?resizew=147)
(1)求证:
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06c2146336a1f42a8fe638886c311023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/9/e05d4ffe-b1ee-4b17-a069-da3f1b1954ae.png?resizew=147)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9025d51ecc5739700eb73fc44a46a056.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
您最近一年使用:0次
名校
5 . 五面体
的底面
是一个边长为4的正方形,
,
,
,二面角
的大小为
.
![](https://img.xkw.com/dksih/QBM/2024/1/20/3415360016310272/3416420538122240/STEM/ddb8c8ba4e424aeca73622906be24bb2.png?resizew=272)
(1)求证:
;
(2)设点P为棱
上一点,若平面
与平面
的夹角的余弦值为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb64353c99068a7a1a8508a22f5b25b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b57b2a77d4f4465e909fe9c0b49a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd721393a3d94cd3560678a50731792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a6d5aaf764583992b9ec1e7dea8f5f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://img.xkw.com/dksih/QBM/2024/1/20/3415360016310272/3416420538122240/STEM/ddb8c8ba4e424aeca73622906be24bb2.png?resizew=272)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d216511526a5834a019505223197d45.png)
(2)设点P为棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c54d01623f09f23103f03ba1135fc6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09d9d486b7f91ba933210dd013a7f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa42621cd6793e7f3673fdb49bc3123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ad17d9b93decf5f49ef629fac4b80b4.png)
您最近一年使用:0次
解题方法
6 . 在
中,角
所对的边分别为
,向量
,向量
,且
.
(1)求证:
;
(2)延长
至点
,使得
.当
最大时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f39d1a40be53305cca203704adfb2e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65517ef81af62fc0a5b609b3020d4fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4d070c5939bb0ec4a9d40d7e3c7d3f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d1aee3d37a48c4e1beac17dde9416e.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699c7a3cc72d45becd25681a16004ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013c405b4ee65dde33b2ea95cd30dafd.png)
您最近一年使用:0次
2024-01-26更新
|
452次组卷
|
2卷引用:广东省深圳市深圳科学高中2023-2024学年高二下学期开学考试数学试题
7 . 如图1,在矩形ABCD中,
,
.将△BCD沿BD翻折至
,且
,如图2.
平面
;
(2)求平面
与平面ABD夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d021334737f555d75a65177f7ebebc81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1efb2224920c1769400e7222006347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/140088b0cb73812aa9d523c44559298a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a935b7d21a103a264b6e96ecf82dbe4a.png)
您最近一年使用:0次
名校
解题方法
8 . 直四棱柱
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/6b8905f2-6b5e-4918-b36a-5349aa3b1c90.png?resizew=157)
(1)求证:平面
平面
;
(2)若四棱柱
的体积为36,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49437f474e5805688dff21ded2d1fd7c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/6b8905f2-6b5e-4918-b36a-5349aa3b1c90.png?resizew=157)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
(2)若四棱柱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cab6ad3d3e3064fa417a02dba02dbf04.png)
您最近一年使用:0次
解题方法
9 . 在
中,角
所对的边分别为
,且
.
(1)求证:
;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1805bef114e6dca3cb833801cbe84f4f.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2264c134952d41fb9bcb90e6c72c83.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9adb9fd694606f1fb640f28acd3ecb4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6402f1010e94be78552ed4c45548b1b8.png)
您最近一年使用:0次
名校
10 . 如图,在四面体
中,
,
分别是线段
,
上的点且
,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/70aa87cb-07fe-4f4f-acf9-7c42596e488f.png?resizew=161)
(1)证明:
平面
;
(2)在线段
上是否存在点
,使得
与平面
所成角的正弦值为
?若存在,求
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b1dc432f4cc96c656fc72b191fcc0d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c74d6bbb593ac43cb5320f0e38ad26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b6d19fedaf8488f9637cd64efbca83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55dbc1e5ecdc9654113807695b14ea1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50ad919a6c21e599494997a6d0428b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/70aa87cb-07fe-4f4f-acf9-7c42596e488f.png?resizew=161)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac0b72906641ed13716cfbce50923282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6261790c66cc71ee3898afabad0c09f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7007bbab668d985a9313d9df989475a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3829aee2b469a14da422ebe555e16117.png)
您最近一年使用:0次