如图,正三棱柱
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/c33e53a3-8bf8-40b8-b536-bba45bb485ff.png?resizew=149)
(1)证明:
平面
;
(2)证明:平面
平面
;
(3)求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb8dadb0d22b74c0eb829093d7df2138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/c33e53a3-8bf8-40b8-b536-bba45bb485ff.png?resizew=149)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896e293411e2fd0da215ff20781cb36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b91c857bbe3c4f0f08dd2a4124a96e.png)
(2)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c5088536dad890222fe47df3de5efb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b91c857bbe3c4f0f08dd2a4124a96e.png)
更新时间:2021-12-06 10:33:46
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】如图,在四棱柱
中,侧面
底面
,
,底面
为直角梯形,其中
,
,
,O为
中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/f1d8ce05-c0f2-49c3-ab0c-b488c090a759.png?resizew=237)
(1)求证:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f67c2d29909f744a60448e409f0fbab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d540455054b9781297a1e871949be43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5acb763021bf166ca719d07223591d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04a93f5289c1483bc39b0125fdc8dd67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/29/f1d8ce05-c0f2-49c3-ab0c-b488c090a759.png?resizew=237)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80ade405849474f527af4d0d407066f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42e4d3ce220fd60e952c957fb71a6d1.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,已知四棱锥
的正视图和侧视图均是直角三角形,俯视图为矩形,N、F分别是SC、AB的中点,
,
.
(1)求证:SA⊥平面ABCD
(2)求证:NF∥平面SAD;
(3)求二面角A-BN-C的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f08faa7f1550cb3732de12b2be5fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d83f35df4c2f90bca3ce179450cf1d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/510cad489ea9604845d41a1795b2b7e3.png)
(1)求证:SA⊥平面ABCD
(2)求证:NF∥平面SAD;
(3)求二面角A-BN-C的余弦值.
![](https://img.xkw.com/dksih/QBM/2012/2/17/1570744529928192/1570744535457792/STEM/766dd15e4d03475ca1167b3f97b347a5.png?resizew=426)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐3】如图所示,在直三棱柱
中,
是边长为
的等边三角形,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600433800716288/2602915744079872/STEM/f1242c80deee409399ef6fdd1d3d8188.png?resizew=172)
(1)证明:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
(2)若
,求
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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d061c7a9c98768ead226c27bdfd2f0.png)
![](https://img.xkw.com/dksih/QBM/2020/11/25/2600433800716288/2602915744079872/STEM/f1242c80deee409399ef6fdd1d3d8188.png?resizew=172)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ae72f5e5891249caa10c43224da89c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42da806a6bd2472459f6c4ad1dab7b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
您最近一年使用:0次
【推荐1】如图,点
在以
为直径的圆
上,
垂直与圆
所在平面,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/e5f2456c-9d7d-4db4-9613-956a608d9d04.png?resizew=151)
(1)求证:平面
平面
;
(2)若
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/e5f2456c-9d7d-4db4-9613-956a608d9d04.png?resizew=151)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b2b7ac585f315b881360285a23fb83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,在四棱锥
中,底面
是矩形,
平面
,
、
与平面
所成的角依次是
和
,
,
,
依次是
,
上的点,其中
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/e9868b70-77e3-485e-be54-e29a45b898f9.png?resizew=159)
(1)求直线
与平面
所成的角(结果用反三角函数值表示);
(2)求三棱锥
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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71536440db7649d375d1b98c054d24d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab2742cfab7efc384743da22816afe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5928b9bea09600c0b8d5997e32e01e12.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/e9868b70-77e3-485e-be54-e29a45b898f9.png?resizew=159)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec66c1d36c6c2be3d3fc4519dfca195e.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图1,在
中,
,
,
,且
分别为BC,AD的中点,延长CE交AB于点F.现将△ACD沿AD翻折至△AC'D,使得
,如图2所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/8b25cad7-4f05-4702-a9c6-93257f85a5df.png?resizew=493)
(1)求证:
;
(2)点G为线段C'D的中点,求直线FG与平面BEC'所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178a27068cf5517ad64f211af10256ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c7f0d0987ee427b7efbbf889b9bf16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e1f4f255d191786f7d330d278868c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/794cd813dabab72619eb276f93c1769e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/19/8b25cad7-4f05-4702-a9c6-93257f85a5df.png?resizew=493)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed96a8bd80187c8ed5fdf272832ca8a4.png)
(2)点G为线段C'D的中点,求直线FG与平面BEC'所成角的正弦值.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
解题方法
【推荐1】在三棱锥
中,平面
平面
,
,
分别为
的中点.
(1)求证:
平面
;
(2)求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8704811c9c5dba854310ae0de2ba6b05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef19f98e86ae7504671413780b3b1a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd39a54ab147b56a0b6fd0fefe6d596d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eed6757a4ff7cd9042c4078bd910583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08452588675f76da2f8d31387b3a8224.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90cacdef2c5f2a4b00a1f4f3fe77bd9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f526e2fe627bb4ddebe708c07d0a22fc.png)
![](https://img.xkw.com/dksih/QBM/2018/2/3/1874572353593344/1876071999971328/STEM/4a1fc66a-c795-4b53-aac6-d16ed0002a6b.png)
您最近一年使用:0次
【推荐2】如图,长方体
中,
,
.
分别为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/e715e97f-e0dd-4d50-9caa-eb9e64da9ad4.png?resizew=181)
(1)求证:平面
平面
;
(2)在底面
上有一个靠近
的四等分点
,求证:
平面
;
(3)求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1f9660760804ff01bbc9319b7342191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b199a99e53d67ff4abf233930961a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a117ca2743a7e5ce9a1fb7af50bee4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/e715e97f-e0dd-4d50-9caa-eb9e64da9ad4.png?resizew=181)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004dd8ad9e5a200b3869ebfc59c2446d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8871ed81ab02b92dca23d036c56a947e.png)
(2)在底面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31d6cfd6485fc2a433918403f65b300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8e0a73e3a34d044a8ad10c9ebb2cd5.png)
(3)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b963bc39627ebf899434ec63d0d014.png)
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