如图,在三棱柱
中,平面
平面
,
边长为8的正方形,
.
(1)求证:
平面
;
(2)求二面角
的余弦值;
(3)证明:在线段
上存在点
,使得
,并求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9fe42fb1a9602d9881331f705217eca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/10/55df57a7-4449-4f47-9d6f-53c336209693.png?resizew=131)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95183b555d54b3a09ac20e9dcacb02ec.png)
(3)证明:在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c84a436704964dc76f16c2c23665ab3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c04c68f1ef1e37534b5bbc7a1f592ef7.png)
23-24高二上·上海·阶段练习 查看更多[2]
更新时间:2023-12-25 13:54:42
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相似题推荐
解答题-问答题
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【推荐1】在三棱锥P−ABC中,AB=BC,BC⊥平面PAB,平面PAC⊥平面ABC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/832db05e-64c8-439f-a97b-63a7229a16cc.png?resizew=149)
(1)证明:PA⊥平面ABC;
(2)若D为PC的中点,且
,求平面DAB与平面ABC所成二面角的余弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/28/832db05e-64c8-439f-a97b-63a7229a16cc.png?resizew=149)
(1)证明:PA⊥平面ABC;
(2)若D为PC的中点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d827c3694aaa02490e0a9c01b45ddc5.png)
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解题方法
【推荐2】如图所示,
平面ABC,
平面ABC,
,
,
,F为BC的中点.
(1)求证:
平面BDE;
(2)求凸多面体ABCED的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5359ad5437bb4605bea0dc58da9b94b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/3/32ae021c-b747-4a26-8d18-363ea0c5fa31.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dcafa398cc6b6079883e7ad153eb62d.png)
(2)求凸多面体ABCED的体积.
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【推荐3】如图1,在
中,
,D为
的中点,将
沿
折起,得到如图2所示的三棱锥
,二面角
为直二面角.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/a222f59a-e6d3-4565-8a9d-92e6ce9e501a.png?resizew=354)
(1)求证:
平面
;
(2)设
为
的中点,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d69f4a5fb68fb0170e394a78ea233f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a9ec3b527947cad9caa4537e0cb7e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02a7ba7cd0c654714c967a900513ba16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/a222f59a-e6d3-4565-8a9d-92e6ce9e501a.png?resizew=354)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75391dc7a2d0ca96f731e0ca2d6dd575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c539709f3b8449ef9cd00a86e194c099.png)
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【推荐1】如图,球O是正三棱锥
和
的外接球,M为
的外心,直线AM与线段BC交于点D,D为BC的中点,两三棱锥的高之比为
,E为PA上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/6b6f5eb2-db3b-46ee-b7d2-562daea12a75.png?resizew=163)
(1)证明:
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edc2e23df190c35aafad93410a05b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db26d5fde5cc9ec365d155a13d8c725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a17ed1752f3221f1e9a10323c555a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/23/6b6f5eb2-db3b-46ee-b7d2-562daea12a75.png?resizew=163)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f22f74a1995a5b5fa2a0536606ce1df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2492f61e8b8a5699f2ad48ffb93082.png)
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【推荐2】四棱锥
中,底面
是菱形且
,点
是棱
的中点,平面
与棱
交于点
.
![](https://img.xkw.com/dksih/QBM/2020/7/27/2514929857478656/2515606866288640/STEM/67926d7b-47ae-4ecb-8463-76c5a96af24b.png)
(1)求证:
;
(2)若
为等边三角形,
,平面
平面
,求锐二面角
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/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/7/27/2514929857478656/2515606866288640/STEM/67926d7b-47ae-4ecb-8463-76c5a96af24b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c91baecb97fadd4f8ab49e6effcbc04.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b6383ebd3154b07853d18959c5c8495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590fd474cea16e23415f0e277f8f51f3.png)
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【推荐1】如图,在正方体
中,点
在线段
上,
,点
为线段
上的动点.
![](https://img.xkw.com/dksih/QBM/2022/5/30/2990814569807872/2991817146638336/STEM/0f901b30-8600-4771-8371-3cc7e93b06ff.png?resizew=164)
(1)若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
,求
的值;
(2)当
为
中点时,求二面角
的正切值.
![](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/e539f26ed5e0b20ff7220559324869a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d120e541a1690d9a9db9db9fc5ca54a2.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/2022/5/30/2990814569807872/2991817146638336/STEM/0f901b30-8600-4771-8371-3cc7e93b06ff.png?resizew=164)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ebb05874eb3353d754af24c9974273e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ddb339df743a4f0347823beee5516b6.png)
(2)当
![](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/e685dde92d0192739da59f6e43b808e3.png)
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【推荐2】如图,在四棱锥
中,平面
平面ABCD,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/751c8b95-019e-4e92-ba60-067b6284f69f.png?resizew=160)
(1)证明:
;
(2)若直线
与平面PAD所成角的正切值等于
,求平面PAD与平面PBC所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa1162d5481e2441fe5bc0d49a576b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129ab17dfccbe0c7774f51f3e3fe2623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/751c8b95-019e-4e92-ba60-067b6284f69f.png?resizew=160)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b07e317ffe7859e81b42ef4970e344a.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
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【推荐3】如图,在四棱锥
中,底面
是正方形,侧棱
底面
,E、F分别是PC、AD中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/6d77f84e-71b0-41fd-8cc6-c2a7e4c06044.png?resizew=126)
(1)判断直线DE与平面
的位置关系;
(2)若PB与平面
所成角为
,求平面
与平面
所成二面角大小的正弦值.
![](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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/6d77f84e-71b0-41fd-8cc6-c2a7e4c06044.png?resizew=126)
(1)判断直线DE与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e7d8c07bb0876c1e3eec161968f3d88.png)
(2)若PB与平面
![](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/2e7d8c07bb0876c1e3eec161968f3d88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/466fabcaac59132fea648ff35342ec9d.png)
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