解题方法
1 . 如图,在四棱锥中
中,
,
,
,
,
是正三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/fefe71de-e744-4ee3-9525-7dd09fcaaee8.png?resizew=142)
(1)求证:
;
(2)求
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/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c9d5c0b9d7b7cf3e14f56bc3b4ac2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6914d401b0e7099dbea8ebdd5052ee7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/fefe71de-e744-4ee3-9525-7dd09fcaaee8.png?resizew=142)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0530f462e5ec1e58c46e1f7644d0cc21.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
您最近一年使用:0次
2020-02-27更新
|
1407次组卷
|
3卷引用:四川省内江市2019-2020学年高二上学期期末数学(理)试题
2 . 如图1,ABCD为菱形,∠ABC=60°,△PAB是边长为2的等边三角形,点M为AB的中点,将△PAB沿AB边折起,使平面PAB⊥平面ABCD,连接PC、PD,如图2,
![](https://img.xkw.com/dksih/QBM/2020/1/10/2374139253850112/2374934092824576/STEM/bb68959d-48fa-4e96-9181-d77cd8f8fa48.png)
(1)证明:AB⊥PC;
(2)求PD与平面ABCD所成角的正弦值
(3)在线段PD上是否存在点N,使得PB∥平面MNC?若存在,请找出N点的位置;若不存在,请说明理由
![](https://img.xkw.com/dksih/QBM/2020/1/10/2374139253850112/2374934092824576/STEM/bb68959d-48fa-4e96-9181-d77cd8f8fa48.png)
(1)证明:AB⊥PC;
(2)求PD与平面ABCD所成角的正弦值
(3)在线段PD上是否存在点N,使得PB∥平面MNC?若存在,请找出N点的位置;若不存在,请说明理由
您最近一年使用:0次
2020-01-11更新
|
1026次组卷
|
8卷引用:四川省成都市温江区2018-2019学年高一下学期期末数学试题
3 . 如图,已知
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852d9e14fa82e578158cbf961d079d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d954a105c21f72c615d67e3ef80fda78.png)
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/4f20edb3-037b-427f-a334-ab1612c26d73.png?resizew=139)
(1)求证:平面
平面
;
(2)求直线
与平面
所成角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852d9e14fa82e578158cbf961d079d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d954a105c21f72c615d67e3ef80fda78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d31958388143741b9cb32dba9af11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/4f20edb3-037b-427f-a334-ab1612c26d73.png?resizew=139)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/286fa8a5d88da060a6d6bea468996283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7f072f0834ebdf155abc5dcc9c8d99.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7f072f0834ebdf155abc5dcc9c8d99.png)
您最近一年使用:0次
2019-12-03更新
|
614次组卷
|
2卷引用:四川省雅安市2019-2020学年高一下学期期末考试数学试题
4 . 在四棱锥
中,底面
是平行四边形,
平面
,点
,
分别为
,
的中点,且
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/8ea93558-85f5-4ccf-9a6b-55f5e01f40c2.png?resizew=167)
(1)证明:
平面
;
(2)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/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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3b10835116b9b777a666b438c907b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/8ea93558-85f5-4ccf-9a6b-55f5e01f40c2.png?resizew=167)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02438f0423acd0ff2dfa5ffb6abf143f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
您最近一年使用:0次
5 . 在三棱柱
中,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce3cec96c4e1314eca67595920d726e.png)
,
,
是线段
上的中点.
![](https://img.xkw.com/dksih/QBM/2018/8/14/2010129394106368/2012968273346560/STEM/f5eadc7aad114e2e9016231639e84a4a.png?resizew=163)
(1)求证:
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
(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/cc61a2aa5d8aebe6773d235f31ed81f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce3cec96c4e1314eca67595920d726e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2018/8/14/2010129394106368/2012968273346560/STEM/f5eadc7aad114e2e9016231639e84a4a.png?resizew=163)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4557a368725226f2c8ea2efb7d30e478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62fd0b510920be6bc60d170c3ff3da3.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd4c85bb98a2a0afddd7ed92578ad2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
您最近一年使用:0次
6 . 如图,四面体
中,
分别是
的中点,![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040089600000/1869535616679936/STEM/aecf51cb0ff24a209667b5996be7d108.png?resizew=203)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040089600000/1869535616679936/STEM/4b57e338e4b342c3bd3a4d91ca7f730e.png?resizew=144)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040089600000/1869535616679936/STEM/81bcf23aaf4d4ebfae24e5a584c60790.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040089600000/1869535616679936/STEM/08529a3567294ac298595b590fc3c41c.png?resizew=43)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040089600000/1869535616679936/STEM/2fd23893557e445eb99bd77b466b457a.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040089600000/1869535616679936/STEM/aecf51cb0ff24a209667b5996be7d108.png?resizew=203)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040089600000/1869535616679936/STEM/4b57e338e4b342c3bd3a4d91ca7f730e.png?resizew=144)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040089600000/1869535616679936/STEM/5f12ce66f7e6435eaf2902ad169ba390.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040089600000/1869535616679936/STEM/c601a74b56174290946561878a458afe.png?resizew=39)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
您最近一年使用:0次
7 . 如图,四面体
中,
分别是
的中点,![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/940f3b1349f242c6b0920c61e21e6fc3.png?resizew=229)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/34c436ee940b42629800cdc93f932137.png?resizew=144)
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/d401d3bc90a54f369af75f4cd53d2112.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/07eb632669dc4cde8faea1f75b4feb0e.png?resizew=43)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/5689b0eef29e4ca7862381e4965e2702.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/940f3b1349f242c6b0920c61e21e6fc3.png?resizew=229)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/34c436ee940b42629800cdc93f932137.png?resizew=144)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/97f07fe9481845a5b57023cb8d29c939.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/1dccb4a118b743d29748a02c0db59637.png?resizew=39)
(2)求直线
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/222cecc00c924b1e8bd03c0f4bf04e1b.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2018/1/25/1868040102723584/1868950830022656/STEM/019d101daf1a46ad844e2dc1ec267b08.png?resizew=39)
您最近一年使用:0次
名校
8 . 如图所示,在直三棱柱
中,
,
,
分别是
,
的中点.
(1)求证:
平面
;
(2)求直线
和平面
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836454922ab97fd8e2603eb05d19eed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/b023581f-06e2-4b58-95c7-1fed0362b052.png?resizew=151)
您最近一年使用:0次
2018-01-17更新
|
1621次组卷
|
5卷引用:四川省眉山市眉山中学校2022-2023学年高二上学期期末数学文科试题
9 . 如图,梯形
中,
,
,且
,沿
将梯形
折起,使得平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/0edd67c0-4f8c-41c0-ab01-f3b46ae9fe31.png?resizew=248)
(1)证明:
平面
;
(2)求三棱锥
的体积;
(3)求直线
与平面
所求的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd3e927b7b2383ccded03838ae8b30b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eed15d0ed75bf936f224f931da5d950.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439989e16005cdeaf40fd60437bfef54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d5a164bf56f8fb92527ad78bc10ccf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5470335edde48868aa7243ed2b67170b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/21/0edd67c0-4f8c-41c0-ab01-f3b46ae9fe31.png?resizew=248)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8197bf06d017950c85c3ba6a291c095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8379ddbd4f02ccfa502592cc4eeae4f1.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
您最近一年使用:0次
2017-07-07更新
|
1042次组卷
|
2卷引用:四川省简阳市2016-2017学年高一下学期期末考试数学(文)试题
10 . 已知
为正方体,
,
分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/2016/4/22/1572601430384640/1572601436479488/STEM/0886319f-67ec-4bf2-b289-9f61764afba8.png?resizew=206)
(1)求证:直线
平面
;
(2)求直线
与平面
所成角的余弦值.
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/2016/4/22/1572601430384640/1572601436479488/STEM/0886319f-67ec-4bf2-b289-9f61764afba8.png?resizew=206)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
您最近一年使用:0次
2016-12-04更新
|
541次组卷
|
2卷引用:2015-2016学年四川省遂宁市高二上学期期末考试理科数学试卷