名校
解题方法
1 . 如图所示,在正方体ABCD-A1B1C1D1中,M、N分别为A1C、BC1的中点.求证:
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698985168470016/2807068634955776/STEM/9fee836c-841b-4430-8cfa-e5f0dd4b7d93.png?resizew=262)
(1)MN∥平面A1B1C1D1;
(2)A1C⊥平面BDC1.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698985168470016/2807068634955776/STEM/9fee836c-841b-4430-8cfa-e5f0dd4b7d93.png?resizew=262)
(1)MN∥平面A1B1C1D1;
(2)A1C⊥平面BDC1.
您最近一年使用:0次
2021-09-13更新
|
218次组卷
|
4卷引用:广西贵港市覃塘区覃塘高级中学2020-2021学年高二3月月考数学(文)试题
解题方法
2 .
是圆
的直径,点
是圆
上的动点(点
不与
、
重合),过动点
的直线
垂直于圆
所在的平面,
、
分别是
、
的中点,则下列结论错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/0a392d05d3cfcbb438569b1ea9980dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4fce8e923062b9779553d6f282895b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a392d05d3cfcbb438569b1ea9980dc2.png)
A.直线![]() ![]() | B.直线![]() ![]() |
C.![]() | D.![]() |
您最近一年使用:0次
解题方法
3 . 如图,直三棱柱
中,
,
、
分别为
、
的中点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
,二面角
的大小为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/3793dfdc-51f2-4c27-b6e2-1ccc3ecedc4a.png?resizew=168)
(Ⅰ)证明:
平面
;
(Ⅱ)求
与平面
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926d1308d5db144e31b4d0211c63ef52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/3793dfdc-51f2-4c27-b6e2-1ccc3ecedc4a.png?resizew=168)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78172568aac9805d2ea2d5f742bf80c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(Ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
您最近一年使用:0次
4 . 在如图所示的四棱锥
中,已知
平面
,
,
,
,
,
为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/4/20/2703939383148544/2794627584000000/STEM/332e1b6b109940e8a600bda0235f1cef.png?resizew=225)
(1)求证:
平面
;
(2)求证:平面
平面
;
(3)求直线
与平面
所成角的余弦值.
![](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/fcd8e727e4efc22b49649f71ae9c9d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de217862f189f14a9ffa0c40f5368f6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2021/4/20/2703939383148544/2794627584000000/STEM/332e1b6b109940e8a600bda0235f1cef.png?resizew=225)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a90c5466cb1f9810d2739a7634a4352.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
20-21高三下·四川·阶段练习
名校
解题方法
5 . 如图所示,在四棱锥
中,底面
为正方形,
为侧棱
的中点.
![](https://img.xkw.com/dksih/QBM/2021/2/28/2667634258550784/2667749402050560/STEM/e6ebbfe2-662a-4673-836c-6bb328025638.png)
(1)求证:经过
三点的截面平分侧棱
;
(2)若
底面
,且
,求四面体
的体积.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/2021/2/28/2667634258550784/2667749402050560/STEM/e6ebbfe2-662a-4673-836c-6bb328025638.png)
(1)求证:经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00045940432a531a8f07034032d9248d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(2)若
![](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/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd91fffd81d5ee507395f59eb9ddf59.png)
您最近一年使用:0次
2021-02-28更新
|
3821次组卷
|
6卷引用:广西南宁市第三中学2020-2021学年高二下学期月考(一)数学(文)试题
广西南宁市第三中学2020-2021学年高二下学期月考(一)数学(文)试题(已下线)四川省2021届高三下学期诊断性测试数学(文)试题(已下线)专题29 立体几何(解答题)-2021年高考数学(文)二轮复习热点题型精选精练(已下线)专题8.6 第八章《立体几何初步》单元测试(B卷提升篇)-2020-2021学年高一数学必修第二册同步单元AB卷(新教材人教A版,浙江专用)(已下线) 专题18 几何体的表面积与体积的求解 (测)-2021年高三数学二轮复习讲练测(新高考版)(已下线) 专题22 几何体的表面积与体积的求解 (测)-2021年高三数学二轮复习讲练测(文理通用)
6 . 如图,在三棱柱
中,平面
平面
,底面
是等边三角形,侧
是菱形,且
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/2/3/2650014762876928/2651627731943424/STEM/a7edef91-da79-4bc0-aadc-92521a6c6132.png)
(1)证明
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eff0db05826cbff651faf0144904b32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900e00a3609e6043af1034761d4d65f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/2/3/2650014762876928/2651627731943424/STEM/a7edef91-da79-4bc0-aadc-92521a6c6132.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41104641f3e2260d00aeadf8fb8a078a.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46340bfad3505ef24f4916a61dd1a5e.png)
您最近一年使用:0次
名校
解题方法
7 . 如图,正四棱锥
中,底面ABCD的边长为4,
,E为PA的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/31/2648172006858752/2650731563114496/STEM/42ae06088033449cb89444fd4ebb0660.png?resizew=227)
(1)求证:
平面EBD.
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fc6a5e71fa379d613ac1ef1cdf1048.png)
![](https://img.xkw.com/dksih/QBM/2021/1/31/2648172006858752/2650731563114496/STEM/42ae06088033449cb89444fd4ebb0660.png?resizew=227)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb178784aa857d4d4683e650273f054.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52753d89bf58589e2e83b19bd3d140b8.png)
您最近一年使用:0次
名校
8 . 如图,在四棱锥
中,底面
是矩形,
平面
,
为
上的动点.
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644485862883328/2645412115054592/STEM/a9bfcc08-2dd9-4285-ba56-c379d89e954b.png?resizew=255)
(1)若
平面
,请确定点
的位置,并说明理由.
(2)设
,
,若
,求二面角
的正弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644485862883328/2645412115054592/STEM/a9bfcc08-2dd9-4285-ba56-c379d89e954b.png?resizew=255)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b5d2943803894bc5d204e75e2d172b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51471daa86588d2f24b364953a66e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5102c216393e133fa25dba98cd78535.png)
您最近一年使用:0次
2021-01-27更新
|
667次组卷
|
5卷引用:广西河池市2020-2021学年高二上学期期末数学(理)试题
名校
解题方法
9 . 如图,在直三棱柱
中,D,E分别为AB,AC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/566f1e95-5cfb-4b1c-8fca-3b7894a3d518.png?resizew=204)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd6ce72e6a632e4bfa772cae4e0eb46.png)
;
(2)若平面
平面
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/566f1e95-5cfb-4b1c-8fca-3b7894a3d518.png?resizew=204)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dd6ce72e6a632e4bfa772cae4e0eb46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/657dffbd3623b705f871878fbd9df57e.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b3e7c7845a0ec3cbac709fda131764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9874eca4abea481fa84eb772a920f9c7.png)
您最近一年使用:0次
2022-01-12更新
|
827次组卷
|
4卷引用:广西南宁市第三中学五象校区2021-2022学年高二下学期开学考试数学(文)试题
广西南宁市第三中学五象校区2021-2022学年高二下学期开学考试数学(文)试题江苏省扬州市2017-2018学年度第一学期期末调研测试高三数学试题江苏省无锡市天一中学2020-2021学年高一(平行班)下学期期末数学试题(已下线)专题18 立体几何中的平行与垂直问题——备战2022年高考数学二轮复习常考点专题突破
名校
10 . 如图,四棱锥
中,
是边长为2的正三角形,
为正方形,平面
平面
,
、
分别为
、
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/d601446f-d497-4f7d-ae9e-c08879dff65d.png?resizew=129)
(1)证明:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/d601446f-d497-4f7d-ae9e-c08879dff65d.png?resizew=129)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
2022-01-11更新
|
756次组卷
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15卷引用:广西平果市第二中学2020-2021学年高二下学期期中考试数学(理)试题
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