如图,在三棱柱
中,
⊥平面
,
,
是等边三角形,
分别是棱
的中点.证明:
平面
.
![](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/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b23cf5055a5bef45fa9e99719470d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/927456b0989846a2f1573844bbaa2105.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860711d30d762a7398d33ddd2156b880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df6a3413b77478c8d4e1e0389dbf5984.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bff3ccea5989c60e51e321af3f53f54.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/f564324c-5de7-4b34-98c7-e6cad3bbcc15.png?resizew=142)
2023高一·全国·专题练习 查看更多[2]
更新时间:2023-06-09 09:52:47
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相似题推荐
解答题-问答题
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解题方法
【推荐1】如图,三棱锥PABC中,E,F,G分别是AB,AC,AP的中点.证明:平面GFE∥平面PCB.
![](https://img.xkw.com/dksih/QBM/2022/2/4/2909034931707904/2956097293066240/STEM/c074c480427d42ce9abea2c19a75aa3c.png?resizew=291)
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【推荐2】如图,
平面ABCD,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/1f8eab30-aced-4d48-a0ef-06ab94e2cfc2.png?resizew=129)
(1)求证:平面
平面ADE;
(2)若线段CF的长为1,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883200c4d4e82a5411064a644aabfe33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d262480ffb55b7617f44b63f130c154a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88dac2c17c765517c2163ab43bbe1038.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/1f8eab30-aced-4d48-a0ef-06ab94e2cfc2.png?resizew=129)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b456936b953e6cd5a40e99c72b302e1.png)
(2)若线段CF的长为1,求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147310251a463539f66374c1f452fb67.png)
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解答题-证明题
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(0.85)
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【推荐1】如图,四棱锥
的底面
是边长为2的正方形,
平面
,
,
分别是棱
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d863e2d7-5c18-4c47-af3f-ece955bd51b4.png?resizew=194)
(1)求证:
平面
;
(2)若
,求平面
将三棱锥
分成的两部分的体积中较大部分的体积.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/d863e2d7-5c18-4c47-af3f-ece955bd51b4.png?resizew=194)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c482ee1668a59ca21f3ae8b6bad58eae.png)
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解答题-作图题
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【推荐2】如图,已知在直三棱柱
中,
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/b0f37cd1-331e-4c2e-8237-dfefc4113f7d.png?resizew=155)
(1)在图中画出过
三点的截面,并说出截面图形的形状(不必说明画法与理由);
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48593b2bdb51550ec0a2b9d5893d36fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d508af23b2c772ab604c45b3eb081919.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/b0f37cd1-331e-4c2e-8237-dfefc4113f7d.png?resizew=155)
(1)在图中画出过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a5f302c1c2f7e1b46cad05594ed672e.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9145a795e5f18846107a7355075bd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcdb0295b373c6e306ca0dcf86f8b941.png)
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