如图在四棱锥
中,
,
,
,
,
.
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/4/26/2708333832388608/2786526973804544/STEM/881a9c07-9d3e-49ba-a041-50fb4069481e.png?resizew=209)
(1)求证:
平面
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de728cae820b49ee7164cdbe600bdc92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8216185daba3b3d58e4b6ee6c579f006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a6c501e8522d47051f0dd296e427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43951dba3f9f8548c47bf6f26d58f17e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2021/4/26/2708333832388608/2786526973804544/STEM/881a9c07-9d3e-49ba-a041-50fb4069481e.png?resizew=209)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e68cd41f4d22e9b05ab846af585a0e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
更新时间:2021-08-15 08:26:33
|
相似题推荐
解答题-证明题
|
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解题方法
【推荐1】如图,在四棱锥
中,
底面
,底面
是直角梯形,
,
,
是
上的一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/317ae1a1-a491-4317-84ab-065a82998917.png?resizew=240)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/018ec5bd-d0f2-4f57-b41a-5027fe0167b4.png?resizew=244)
(1)求证:平面
平面
;
(2)如图(1),若
,求证:
平面
;
(3)如图(2),若
是
的中点,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0465d52848d924b0576172c9b22a831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd3c2e2199cd4565c05b949bc21fc37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87827211113fd8f5d1afd793927222d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/317ae1a1-a491-4317-84ab-065a82998917.png?resizew=240)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/018ec5bd-d0f2-4f57-b41a-5027fe0167b4.png?resizew=244)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/677d1863ff4d8ac1604b18149d4f320f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)如图(1),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceca6155563238c77dee3fdc735637b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36222db36e348661eb5f616820e4e60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
(3)如图(2),若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5102c216393e133fa25dba98cd78535.png)
您最近一年使用:0次
解答题-问答题
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【推荐2】如图,直三棱柱
的底面为直角三角形,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/2022/3/3/2928234200891392/2933081666584576/STEM/ae97a022-0e35-485a-8b74-c4fac0031700.png?resizew=151)
(1)证明:
平面
;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56b66218bbfb24acee762d795831e42c.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/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/2022/3/3/2928234200891392/2933081666584576/STEM/ae97a022-0e35-485a-8b74-c4fac0031700.png?resizew=151)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fee653bfbb3ae72116221a28aa1dd64.png)
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名校
【推荐3】如图所示,在长方体
中,
,
,点
为线段
的中点,点
为线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/376fd173-4506-4112-8a25-c24144ddca7c.png?resizew=253)
(1)求
与平面
所成角的正弦值;
(2)求证:
平面
,并求直线
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d64fc81c857b124268609a8beb77b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/376fd173-4506-4112-8a25-c24144ddca7c.png?resizew=253)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111da2c687a67fd089c365090908eb00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3ef97d64e58d311019b70fe5e2cc0d.png)
您最近一年使用:0次
解答题-问答题
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【推荐1】如图,四棱锥
中,底面
为直角梯形,
,
,
平面
,
,
、
分别为
与
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/d3d1b26f-e588-4d10-911e-709693635edc.png?resizew=159)
(1)证明:
平面
;
(2)求直线
与平面
所成角的正切值.
![](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/9536a2be7b84612f45cc875a00c5a5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd8e727e4efc22b49649f71ae9c9d84.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/b879e4b8a2e0dc40fdd94932ea8e9bb6.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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/31/d3d1b26f-e588-4d10-911e-709693635edc.png?resizew=159)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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较易
(0.85)
【推荐2】如图,已知正方形
和矩形
所在的平面互相垂直,
,
,
是线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/64f61548-2ba0-4948-a859-335b48349790.png?resizew=238)
(1)求三棱锥
的体积;
(2)求
与平面
所成的角大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4b93d7abcfc4c3df48f03aa969c17f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea52361458ce2e49ed0fe99d8e6c02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/6/64f61548-2ba0-4948-a859-335b48349790.png?resizew=238)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b635e62c3b1f4a57feac8d22be84ee.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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