如图,在直四棱柱
中,底面四边形
是直角梯形,其中
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/20036beb-06de-45f2-a6df-42441a4d94c5.png?resizew=229)
(1)求证:直线
平面
;
(2)试求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8bbc9f369f0eb01aa216d8e728d985b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/20036beb-06de-45f2-a6df-42441a4d94c5.png?resizew=229)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762b8cac66d86a013ba839266b023e54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
(2)试求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658c43c2ff8aa0beb27938926a386695.png)
更新时间:2017-04-01 22:15:15
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相似题推荐
解答题-证明题
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【推荐1】如图,在多面体
中,
和
交于一点,除
以外的其余各棱长均为2.
![](https://img.xkw.com/dksih/QBM/2018/12/15/2097563263049728/2099437580378112/STEM/8ed809e06db141fca28bd8ccb23ff280.png?resizew=183)
作平面
与平面
的交线
,并写出作法及理由;
求证:
;
若平面
平面
,求多面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6723f8b9d907981aa735cd96386bee36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
![](https://img.xkw.com/dksih/QBM/2018/12/15/2097563263049728/2099437580378112/STEM/8ed809e06db141fca28bd8ccb23ff280.png?resizew=183)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d151723aa1a6a8a52d8c5327011e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68251f6ce06168cfb89fe164ecf104ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d09072f5be97caf5e942ae8fc16b0bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09446528b12dd384c6828e1ef1c70e90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e51078cf2c797ace8a312405adb753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5820225ca91e956f5c41b8ef0e213abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2980b0d9e5daae1f60b4a67e9b87fff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d09072f5be97caf5e942ae8fc16b0bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6723f8b9d907981aa735cd96386bee36.png)
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【推荐2】如图,在多面体ABCDEFG中,已知ADGC是正方形,
,
,
平面ADGC,M,N分别是AC,BF的中点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9741e43512323d96f36317543793ddf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/d7733fd4-8d0e-400b-b79f-db1d12009e03.png?resizew=162)
(1)求证:
平面AFG;
(2)已知
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b86f75a1d0f9f52a0d0254ece9bf3f94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f2ec1b138f1de58f70301c0e281b410.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d88d863bbe0a300e8c2f464574c4f5e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9741e43512323d96f36317543793ddf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/d7733fd4-8d0e-400b-b79f-db1d12009e03.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7dfd1eec25cda01e9af2f6a88608bd.png)
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【推荐1】如图,在四棱锥
中,底面
是等腰梯形,
,
为
的中点,
平面
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/7/5/2757525327659008/2780140494118912/STEM/47b173ed5f454c2198b8a5f526e88f17.png?resizew=377)
(1)求证:
平面
;
(2)求点
到平面
的距离.
![](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/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcc3c35ffa4d121697f59b044b43d064.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/2021/7/5/2757525327659008/2780140494118912/STEM/47b173ed5f454c2198b8a5f526e88f17.png?resizew=377)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0457394ce4f2dc8d940c565c94dcf557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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【推荐2】如图所示,在正四棱锥
中,底面
的中心为
,
于
,
与
交点为
,
.
平面
.
(2)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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03d3b1a7b201f380f960db4b6ff2943.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4060489388a45c7f697de96a69e13aa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4406e13f81cb4fecb12ec3cc05ccc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bde9b5f82a926bc5cc035023d98f3bb0.png)
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【推荐3】如图,三棱柱
中,
平面
,
,
,
,
,
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2021/8/15/2786941792919552/2793333053390848/STEM/8a541356-a1e1-4103-86fe-661471be21aa.png?resizew=275)
(1)证明:
平面
:
(2)
是线段
上一点,且直线
与平面
所成角的正弦值为
,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a9ad711b25c36dae0c2a2cedff9954.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d25e8fc3dda4f8b45491514b6e22a962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d97f616f0f32beed421129cbbb4db8d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2021/8/15/2786941792919552/2793333053390848/STEM/8a541356-a1e1-4103-86fe-661471be21aa.png?resizew=275)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063510e3c1fb6a7ccc3b8e3e3c7d660e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7ae8d6b308aee3387116f0ec92339d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5846494f0ee2c4ab2d1cc32b785adc3.png)
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解题方法
【推荐1】在如图所示的正方体
中,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/32983ca5-6221-4f55-b963-adedcf38d3e2.png?resizew=167)
(1)过点C作与面
平行的截面;
(2)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750058175e99337ed9581237c3246423.png)
(3)若正方体的棱长为2,求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/32983ca5-6221-4f55-b963-adedcf38d3e2.png?resizew=167)
(1)过点C作与面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935fe3125f247b7bea4f065ce9ad985.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750058175e99337ed9581237c3246423.png)
(3)若正方体的棱长为2,求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17a08bf4a12ab392df471fe315d02f3.png)
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【推荐2】如图,在直三棱柱
中,
.
![](https://img.xkw.com/dksih/QBM/2022/9/2/3057656102273024/3058567951220736/STEM/cdbc670346c34504a078ffa413516fa5.png?resizew=176)
(1)证明:
;
(2)若三棱锥
的体积为
,求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8b183b8391f5d9b2b7c4c6e7a7e6f35.png)
![](https://img.xkw.com/dksih/QBM/2022/9/2/3057656102273024/3058567951220736/STEM/cdbc670346c34504a078ffa413516fa5.png?resizew=176)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47af45fbf1714055d9b414a44a8613fa.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095cc9746488584e6b878e5a6dfe9f35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c14ff9b66f21c05e52dc3c8908c2df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90bf62a5229257b6ed65f3a47873dd3.png)
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【推荐1】如图,在三棱柱
中,
,
,
.点M,N分别为线段
的中点.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974092124045312/2974184443273216/STEM/8a643065-b44a-4316-8be5-e71c3dedd24d.png?resizew=169)
(1)求证:
;
(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/6ca248c05ba166ac40d795f8481459ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f81db6b418e3bb9c0c3fe301d6962c0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11197fb5a297ccd643d34ecdbd04f794.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094a47c5223647426acbe62ce7eb9be9.png)
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974092124045312/2974184443273216/STEM/8a643065-b44a-4316-8be5-e71c3dedd24d.png?resizew=169)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba985fb50a9078a839b66bf1d1eadea9.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
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解题方法
【推荐2】如图,在四棱锥
中,底面
为正方形,
底面
,M为线段
的中点,
,N为线段
上的动点.
;
(2)当N为线段
的中点时,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/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b624742fe28db114e0554c6c87bff05c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62b587689cd46c83c260353e7098a487.png)
(2)当N为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cd14cd2875ed363428c3e8918b74a7.png)
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【推荐3】如图,在四棱锥
中,
平面
,底面
为直角梯形,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/985decb8-2ecd-477f-9cfa-e5af6f62e313.png?resizew=174)
(1)证明:
.
(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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbe8961cca9440ea334ee049d109146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/27/985decb8-2ecd-477f-9cfa-e5af6f62e313.png?resizew=174)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bafa8c14100a4f847b41b9148954116c.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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