如图,三棱柱
中,侧棱
与底面垂直,
,
,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/2452f8e2-e5d9-43ff-8a5d-ef3f75402f26.png?resizew=278)
(1)证明:
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a20a3e3f5e68bc44b75a947af9633b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8b44700b12c396e09adbb626ba6c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae00c1ede31a736949e7e712f8720d66.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/2452f8e2-e5d9-43ff-8a5d-ef3f75402f26.png?resizew=278)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd2b6853eddf892b456599f2ce82a6b.png)
更新时间:2017-07-26 13:31:09
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【推荐1】如图,在直三棱柱(侧棱与底面垂直的三棱柱)
中,
,点D是侧棱
延长线上一点,EF是平面ABD与平面
的交线.
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096495491629056/2098987604213760/STEM/aa9e5ab2a73e446abdbf9c069269b361.png?resizew=126)
(1)求证:
;
(2)当直线BD与平面ABC所成角的正切值为
时,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e32876a1f50ae401830d3c5c4513f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b16cff607cdc2d69afc70dc778acbb.png)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096495491629056/2098987604213760/STEM/aa9e5ab2a73e446abdbf9c069269b361.png?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca08229da992fdd08d6cb1efeb469b1.png)
(2)当直线BD与平面ABC所成角的正切值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/448f5c45be5e4ee2e189204d334b83fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98eda189662dd9e479f52c251fb37765.png)
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【推荐2】已知直三棱柱
(如图所示),底面
是边长为2的正三角形,
,
为
的中点.
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d8cb98c0adee7ca698d8b17dacb845b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02cb62f4c1e0e023619922eb8a509c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/641d9688e81760c02d0dfc4ba015afb1.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cd5d1b72eccfb437d85ae09382026ee.png)
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【推荐1】如图,在棱长为2的正方体
中,
为
中点,
为
与
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/051aa8e3-7db5-4107-83fd-2abd37e64fc1.png?resizew=202)
(1)求三棱锥
的体积;
(2)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
平面
;
(3)证明:
平面
.
![](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/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/051aa8e3-7db5-4107-83fd-2abd37e64fc1.png?resizew=202)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0625187f35c80fb49277693e6b41b021.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a8d86cda29fe8beb90de622c237494f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
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【推荐2】如图,PA⊥平面ABCD,四边形ABCD是矩形,
,
,点F为PB中点,点E在边BC上移动.
![](https://img.xkw.com/dksih/QBM/2023/3/25/3201976161361920/3203123516465152/STEM/2993a83a6632411b86f142fd113a7f54.png?resizew=143)
(1)求证:
平面AFC;
(2)若二面角
的大小为60°,则CE为何值时,三棱锥
的体积为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://img.xkw.com/dksih/QBM/2023/3/25/3201976161361920/3203123516465152/STEM/2993a83a6632411b86f142fd113a7f54.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36222db36e348661eb5f616820e4e60f.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b796bbaeb8450404c2d146283562006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/437c9774700f6c066b3e19d17d54b368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
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【推荐3】如图,EA和DC都垂直于平面ABC,且EA=2DC,AC=BC,F是BE中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/a92f0cb3-1cf2-4fc7-b401-4bd41f0d5ca6.png?resizew=140)
(1)求证:DC∥平面AEB;
(2)求证:DF⊥平面AEB.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/a92f0cb3-1cf2-4fc7-b401-4bd41f0d5ca6.png?resizew=140)
(1)求证:DC∥平面AEB;
(2)求证:DF⊥平面AEB.
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