如图:已知四棱锥P﹣ABCD中,PD⊥平面ABCD,ABCD是正方形,E是PA的中点,求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/3a329755-7469-4627-8ba3-2e5a379cf8b2.png?resizew=157)
(1)PC∥平面EBD;
(2)BC⊥平面PCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/3a329755-7469-4627-8ba3-2e5a379cf8b2.png?resizew=157)
(1)PC∥平面EBD;
(2)BC⊥平面PCD.
更新时间:2022-04-07 11:32:23
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【推荐1】如图,在四面体ABCD中,截面PQMN是平行四边形
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/66e4c5c4-bd0f-4194-b82e-3edb3cae011f.png?resizew=185)
(1)求证:PN//平面BCD
(2)求证:BD//PN
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/66e4c5c4-bd0f-4194-b82e-3edb3cae011f.png?resizew=185)
(1)求证:PN//平面BCD
(2)求证:BD//PN
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【推荐2】如图1,在直角梯形ABCD中,
,
,且
.现以
为一边向形外作正方形
,然后沿边
将正方形
翻折,使平面
与平面
垂直,
为
的中点,如图2.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/cdce821f-145a-4e6f-b7d6-057f9d88518d.png?resizew=192)
(1)求证:
平面
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0046177466c78f08d45449dc5639bf38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/cdce821f-145a-4e6f-b7d6-057f9d88518d.png?resizew=192)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac480d8d9d7821b62a603cf5cfda236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a814b70236a108be5d6e7ff271fe92.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
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【推荐1】如图所示,四棱锥
中,底面
为菱形,且直线
又棱![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74871229689ee1f495f53d31176f5551.png)
为
的中点,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b917f21ac89650205583175b272e76.png)
(Ⅰ) 求证:直线
;
(Ⅱ) 求直线
与平面
的正切值.
![](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/0f6d7edbc311a7e931c591d6e2b0318e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74871229689ee1f495f53d31176f5551.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b917f21ac89650205583175b272e76.png)
(Ⅰ) 求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8147795f554247ad5b0f0933b918187b.png)
(Ⅱ) 求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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【推荐2】如图,
为菱形
外一点,
平面
,
,
为棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/bc3bc157-7804-4240-8d14-fcdaa095c302.png?resizew=177)
(1)求证:
平面
;
(2)若
,求
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/bc3bc157-7804-4240-8d14-fcdaa095c302.png?resizew=177)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7a38e6c6dfde2b19b6b47f35a439a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b610c9b9948d88eda8de0fb8d1cf972.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
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