1 . 已知长方体
中,
,
,
,点
是棱
上的动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/762f7cd8-b226-4577-9c42-8045a61203f5.png?resizew=121)
(1)求三棱锥
的体积;
(2)当点
是棱
上的中点时,求直线
与平面
所成的角(结果用反三角函数值表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e55a2310cbba5e050488cd9296eb195d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/762f7cd8-b226-4577-9c42-8045a61203f5.png?resizew=121)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5841ecf3472c08cda2bc85ab7a601ea.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9857d5b03bcff4181502765995885383.png)
您最近一年使用:0次
2020-01-13更新
|
254次组卷
|
3卷引用:上海市第三女子中学2022届高三上学期期中数学试题
名校
2 . 如图,在三棱锥
中,平面
平面
,
和
均是等腰直角三角形,
,
,
、
分别为
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/88107e3f-fe40-4291-9413-ea576d7ceb4e.png?resizew=153)
(Ⅰ)求证:
平面
;
(Ⅱ)求证:
;
(Ⅲ)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11477bf45c2ad9d554d8f2dbacb5bb67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6677a7d5693deb7e41ed70ecca68f7de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2513bfc5f4c4cbc7c07725b9d59bda6.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/dd4fce8e923062b9779553d6f282895b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95226c64f0afdaa10b95ec097a0720ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/5/88107e3f-fe40-4291-9413-ea576d7ceb4e.png?resizew=153)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fdb2b9d6a4a54ed1328c5b3adcf7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99116c812715c5e15ee73d088da4c253.png)
(Ⅲ)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95226c64f0afdaa10b95ec097a0720ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70db40c42655327adee01caedfc9d50c.png)
您最近一年使用:0次
2020-01-10更新
|
1034次组卷
|
6卷引用:海南省2021届高三下学期体艺生模拟考试数学试题
名校
3 . 如图,矩形
和菱形
所在的平面相互垂直,
,
为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d0f39dc1-1f83-4b7b-99e8-046587ec604a.png?resizew=173)
求证:平面
平面
;
若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2573d44bd027ab2e2fc2472c7852af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d0f39dc1-1f83-4b7b-99e8-046587ec604a.png?resizew=173)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c46daeb77015e09c6044d89451fdba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f2125dfe51596f77b060572f706cbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1412cc57623de195f9da01e2e0d95c60.png)
您最近一年使用:0次
2020-04-30更新
|
415次组卷
|
3卷引用:安徽省六安一中、阜阳一中、合肥八中等校2021-2022学年高三上学期10月联考理科数学试题
名校
解题方法
4 . 如图的虚线网格纸上小正方形的边长为1,粗实线画出的是某几何体的三视图.在该几何体的直观图中,直线
与
所成角的余弦值为( )
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397569787617280/2398867649388544/STEM/44e3a3fb-c39d-4a59-8295-49617b96307e.png?resizew=260)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397569787617280/2398867649388544/STEM/44e3a3fb-c39d-4a59-8295-49617b96307e.png?resizew=260)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
5 . 如图,在正三棱柱
中,
,点Q,R分别为BC,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/46dd90d8-ce92-4e8f-9227-19f613e9e437.png?resizew=157)
(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/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4639a9dc0bc99101cbde59fef04b4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/46dd90d8-ce92-4e8f-9227-19f613e9e437.png?resizew=157)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b135f9912f129046fa3969fd243c0432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbc96c20ebba91031a1c54037fe651c.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbc96c20ebba91031a1c54037fe651c.png)
您最近一年使用:0次
2020-01-02更新
|
272次组卷
|
2卷引用:江西省宁冈中学2022届高三10月份段考数学(理)试题
6 . 已知四棱柱
的底面为菱形,
,
,
,
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/324a68eb-6832-4cc9-83ab-c08c392ff6ea.png?resizew=204)
(1)证明:
平面
;
(2)求钝二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb552b9e21dbaba74d11aa747790.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce03b310edce42191f9fa75a1c909ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd6edf5b50fea3628f602f397ceafcd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/324a68eb-6832-4cc9-83ab-c08c392ff6ea.png?resizew=204)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547a4b438e2e6687c7cd55ea08bbaae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求钝二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104bf24922707215be95a860cd533940.png)
您最近一年使用:0次
2019-12-27更新
|
1450次组卷
|
9卷引用:专题15 运用空间向量研究立体几何问题-2021年高考数学二轮优化提升专题训练(新高考地区专用)【学科网名师堂】
(已下线)专题15 运用空间向量研究立体几何问题-2021年高考数学二轮优化提升专题训练(新高考地区专用)【学科网名师堂】浙江省2021届高三高考数学预测卷(一)山东省九校2019-2020学年高三上学期12月检测数学试题(已下线)卷07-备战2020年新高考数学自学检测黄金10卷-《2020年新高考政策解读与配套资源》新疆乌鲁木齐市第八中学2020-2021学年高二下学期第一阶段考试数学(理)试题(已下线)专题23 盘点空间面面角的问题——备战2022年高考数学二轮复习常考点专题突破福建省泉州第一中学2021-2022学年高二上学期期中考试数学试题山东省东营市第一中学2022-2023学年高三上学期期末数学试题重庆市荣昌中学2023-2024学年高二上学期第一次月考数学试题
7 . 如图,在直三棱柱
中,已知
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/dd9501f0-3e33-481e-b069-867ba8a1963d.png?resizew=134)
(1)求四棱锥
的体积;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee4a1fe46b2a6a98e7f6f9e2415c6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/dd9501f0-3e33-481e-b069-867ba8a1963d.png?resizew=134)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34f6658a6fa46b1597f382a3455ad04.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a824c242050a27d9da3bb3276ea99170.png)
您最近一年使用:0次
2019-11-08更新
|
1241次组卷
|
10卷引用:上海市2021届高三高考数学押题密卷试题07
上海市2021届高三高考数学押题密卷试题07上海市洋泾中学2018—2019学年高三下学期3月月考数学试题上海市复兴高中2017-2018学年高三下学期3月开学考数学试题2017届上海市复旦大学附中浦东分校高三上学期第二次月考数学试题上海市徐汇区南洋模范中学2016届高三上学期9月摸底数学试题重庆市缙云教育联盟2020-2021学年高一下学期期末数学试题浙江省杭州之江高级中学2020-2021学年高二上学期期末数学试题(已下线)考向24空间向量与立体几何-备战2022年高考数学一轮复习考点微专题(上海专用)人教A版(2019) 选修第一册 实战演练 第一章 易错疑难突破专练江苏省连云港市灌南高级中学2023-2024学年高三上学期假期检测(一)数学试题
名校
8 . 如图,四棱锥
中,
平面
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/d208db0a-405e-4e4a-806f-d980b8352a29.png?resizew=137)
(1)求异面直线
与
所成角的余弦值;
(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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4e70017618c1d1a247f09b48505f33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce50e47c6b487e72b6b59069971eb218.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/d208db0a-405e-4e4a-806f-d980b8352a29.png?resizew=137)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e867e5c7ef4da37d8985ce82022060e.png)
您最近一年使用:0次
2019-10-24更新
|
613次组卷
|
3卷引用:上海市延安中学2022届高三上学期期中数学试题
9 . 如图,矩形
所在的平面与直角梯形
所在的平面成
的二面角,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/394bafa5-9305-476e-9ed1-64a4b7785c2e.png?resizew=196)
(1)求证:
面
;
(2)在线段
上求一点
,使锐二面角
的余弦值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5519c1efed9b34725446c2ee488ab3c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb52f9b226b1db3f6f9f055948bd38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b5a218cbc833f26246ba6087a4cd7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56512504254ab7f574a717dd6830fb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f06b1f12937e6eff5e02881860a71b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/394bafa5-9305-476e-9ed1-64a4b7785c2e.png?resizew=196)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8ccd4181f956f6e0140bf0ab8f0716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0e726e470119882d11bad7301924fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/642a7dd471434c923f76809dfa5ee183.png)
您最近一年使用:0次
2019-09-13更新
|
833次组卷
|
3卷引用:理科数学-2021年高考考前20天终极冲刺攻略(三)(课标全国卷)(5月26日)
(已下线)理科数学-2021年高考考前20天终极冲刺攻略(三)(课标全国卷)(5月26日)辽宁省大连市庄河市高级中学2022-2023学年高三上学期12月月考数学试题【全国市级联考 】四川省内江市2018-2019学年高二下学期期末检测数学(理)试题
10 . 如图,在平行六面体
中,底面
是菱形,四边形
是矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/564ec4c1-c0f2-45b2-a491-407ba9001514.png?resizew=201)
(1)求证:
;
(2)若
点
在棱
上,且
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2bf9ef324f1289e205e29fed105c38e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/564ec4c1-c0f2-45b2-a491-407ba9001514.png?resizew=201)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417104247ce266ae42c3a9860f387272.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61d13039125858b5d0685740505bf166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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