解题方法
1 . 矩形ABCD中,
(如图1),将
沿AC折到
的位置,点
在平面ABC上的射影E在AB边上,连结
(如图2).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/29f10317-e6c8-4431-83a8-b538640f68f9.png?resizew=406)
(1)证明:
;
(2)过
的平面与BC平行,作出该平面截三棱锥
所得截面(不要求写作法).记截面分三棱锥所得两部分的体积分别为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d598a5d19c4ea839623aed430aa96d8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/644f63756fe9251e65cc14e1ce9723d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3d4de4f2a11ce4dd04c334e2680483.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c597ff77c65c5add6f50294e3eee9536.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/29f10317-e6c8-4431-83a8-b538640f68f9.png?resizew=406)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d994a45f95ec665cc70801ed8134bcd0.png)
(2)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15dc61d5de97b5a40be925b278ae494c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ebd86a076448d19401268f139b5b90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1414761ee01932fc70f428a91955d6ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
您最近一年使用:0次
解题方法
2 . 如图甲,在矩形
中,
,
是
的中点,将
沿直线
翻折后得到四棱锥
,如图乙,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/6ee5635c-587a-431c-a7e2-a9991b9d1a58.png?resizew=451)
(1)求证:
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d58da37b3d1dbd2fee75089d5ba28134.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efeadd146662b5d8fe14a424138ef751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/12/6ee5635c-587a-431c-a7e2-a9991b9d1a58.png?resizew=451)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d5ee2d6fcbcad17b69997ef0741d2d.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba759550d6c10ffd2922b936888f3973.png)
您最近一年使用:0次
3 . 如图,四棱锥
的底面
是矩形,
平面
,
.
![](https://img.xkw.com/dksih/QBM/2022/7/15/3023254720167936/3026700605685760/STEM/35c7e430ebe44103b612d46bc45ef548.png?resizew=221)
(1)求证:
;
(2)求三棱锥
的体积;
(3)求平面
和平面
夹角的余弦值的大小.
![](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/d5ef03497414d454933f76684ee16970.png)
![](https://img.xkw.com/dksih/QBM/2022/7/15/3023254720167936/3026700605685760/STEM/35c7e430ebe44103b612d46bc45ef548.png?resizew=221)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/712f7375b4ede5f75c0d81870c0f86af.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b568ba5f8e290c966a4fcd4a46005c7.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
名校
解题方法
4 . 如图所示,在三棱柱
中,M为棱
的中点.
![](https://img.xkw.com/dksih/QBM/2021/6/14/2742622851866624/2743036705185792/STEM/f83cddb709ab405f8eb506f80a2379a0.png?resizew=241)
(1)求证∶![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
平面
;
(2)若
⊥平面ABC,
,AB=AC=AA1=2,求点B到平面AB1M的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/2021/6/14/2742622851866624/2743036705185792/STEM/f83cddb709ab405f8eb506f80a2379a0.png?resizew=241)
(1)求证∶
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/770b4f16694b2bd79a1a93d776a82680.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
您最近一年使用:0次
2021-06-14更新
|
1242次组卷
|
4卷引用:贵州省黔东南自治州镇远县文德民族中学校2022届高三上学期期末数学(文)试题
贵州省黔东南自治州镇远县文德民族中学校2022届高三上学期期末数学(文)试题安徽省100名校2020届高三下学期攻疫联考数学(文)试题(已下线)考点32 直线、平面平行的判定及其性质-备战2022年高考数学(文)一轮复习考点帮湖北省武汉外国语学校2020-2021学年高一下学期期末数学试题
名校
解题方法
5 . 已知菱形
的边长为
,
,如图1.沿对角线
将
向上折起至
,连接
,构成一个四面体
,如图2.
;
(2)若
,求四面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c967c9b3f669ea78edd838e1d8b59e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4c18aba9681a8475968248764d4c3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417104247ce266ae42c3a9860f387272.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685534ba47e83433200ce29660875118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4c18aba9681a8475968248764d4c3a.png)
您最近一年使用:0次
2021-11-13更新
|
1017次组卷
|
7卷引用:贵州省贵州师范大学附属中学2021-2022学年高二10月月考数学(理)试题
解题方法
6 . 如图,棱台
中,
,底面ABCD是边长为4的正方形,底面
是边长为2的正方形,连接
,BD,
.
(1)证明:
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3da8c338342e38c9aa3f274c053fd5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7929b25566f051e25a63ad341470523a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d609847e2ff3d64e5a514582c3ead0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/288abe01824f42cfe725509af5aec4cd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/16/ea55b6c1-0ece-4cfc-bcf9-98ab561004e6.png?resizew=158)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/555dfe77eeb168a880694e22bd9acbdd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9271e2c743a961a5abe3edb752cbe2.png)
您最近一年使用:0次
2023-09-15更新
|
262次组卷
|
2卷引用:贵州省遵义市2023届高三第三次统考文科数学试题
解题方法
7 . 如图,在正方体
中,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/0e5377cd-06ee-4056-b69f-06ce46042d85.png?resizew=151)
(1)证明:
平面
.
(2)若
,求四棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a3c176cd586a25166fac58af2e43ea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/0e5377cd-06ee-4056-b69f-06ce46042d85.png?resizew=151)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a5f445af1ae136773cb338920552ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f067183ddb143d5a2473ea7ab90ad7ae.png)
您最近一年使用:0次
2022-07-02更新
|
519次组卷
|
2卷引用:贵州省黔西南州2021-2022学年高二下学期期末质量检测数学(文)试题
名校
解题方法
8 . 如图,在直三棱柱
中,
,
,
,M,N分别是
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/d4920206-3b1f-4eab-b3da-5babedcfc9a7.png?resizew=152)
(1)求证:
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca38004c7744a7567bef30f0674fe60f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3cc9cccfb4c260dac05f4ed57e8c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a696a182fff038a86b2bbe8ca099442.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/23/d4920206-3b1f-4eab-b3da-5babedcfc9a7.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce9ebc509c57beab91d0833dba1b2c6.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9112e61822a648db4979de272f69cbea.png)
您最近一年使用:0次
2022-08-22更新
|
454次组卷
|
4卷引用:贵州省贵阳市2023届高三上学期8月摸底考试数学(文)试题
解题方法
9 . 如图,在四棱锥
中,
,
是边长为
的正三角形,平面
平面
,
,点
,
,
分别是线段
,
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/d6b27c4c-0e3e-468f-b0b5-e3b6ab241445.png?resizew=193)
(1)求证:点
在平面
内;
(2)若
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb99353e3076643c832c8973ac8a6c1.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/73465a1f9aa03481295bf6bd3c6903ac.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/d6b27c4c-0e3e-468f-b0b5-e3b6ab241445.png?resizew=193)
(1)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e375fa6cd4a05814744169b157686077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8504651146697b0ecca4f789790d41ed.png)
您最近一年使用:0次
解题方法
10 . 如图,在四棱锥
中,四边形
是矩形,
,
是正三角形,且
,
.
![](https://img.xkw.com/dksih/QBM/2021/5/27/2730069253390336/2763232167256064/STEM/c7bfb581-3f8d-4cdd-b815-4d342dd53311.png?resizew=251)
(1)求三棱锥
的体积;
(2)若
分别是
,
的中点,求证∶
平面
.
![](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/7b8e49d68afab33806a63d25a0861c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://img.xkw.com/dksih/QBM/2021/5/27/2730069253390336/2763232167256064/STEM/c7bfb581-3f8d-4cdd-b815-4d342dd53311.png?resizew=251)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1978b59fd41a7e45b66355645142aa4b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7592c4f01c8e06c7ee90df5b9413a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
您最近一年使用:0次