已知正方体
.
平面
;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7bfc1d0b50681765bd3fa6d5920ed8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73845d4d663b3de0b281611fe2c762fe.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/774edd1767cdd8de9da66657c30e62eb.png)
22-23高一下·江西南昌·阶段练习 查看更多[2]
更新时间:2023-06-13 15:57:20
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相似题推荐
解答题-证明题
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【推荐1】《九章算术·商功》:“斜解立方,得两堑堵.斜解堑堵,其一为阳马,一为鳖臑”译为:一个长方体沿对角面斜解,得到一模一样的两个堑堵,再沿一个堑堵的一个顶点和相对的棱斜解,得一个四棱锥称为阳马,一个三棱锥称为鳖臑,如图所示.
中,点
分别是棱
的中点.
;
(2)证明:
平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62794ea73abc2a84aa0512c5b205eb12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da48240e7fc3248f773ac1500c15ec14.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
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【推荐2】如图,四棱锥S﹣ABCD中,M是SB的中点,AB∥CD,BC⊥CD,SD⊥面SAB,且AB=BC=2CD=2SD.
(Ⅰ)证明:CD⊥SD;
(Ⅱ)证明:CM∥面SAD.
(Ⅰ)证明:CD⊥SD;
(Ⅱ)证明:CM∥面SAD.
![](https://img.xkw.com/dksih/QBM/2012/2/17/1570748972384256/1570748977889280/STEM/9959c851a9864401880178904cc387f2.png?resizew=184)
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【推荐3】如图所示,已知
平面
,
,点E和F分别为
和
的中点.
平面
;
(2)证明:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1af815b5785ee456c453ed161bfdc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bea124cef7ab3fd8069243e9894d1c59.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb7f072f0834ebdf155abc5dcc9c8d99.png)
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【推荐1】如图,在四棱台
中,
平面
,四边形
为菱形,
.
;
(2)点
是棱
上靠近点
的三等分点,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.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/7ac87a2a320d591b562de5b858a7c223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a382ccd078374f1efebb26a43599e596.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a3e1c1007fafa564b59405ec23c7f8.png)
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【推荐2】如图,已知四棱锥
的底面为直角梯形,平面
平面
,
,
,且
,
,
,
的中点分别是
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/d5335cbd-3757-4f41-9e8a-62b36a27ca75.png?resizew=179)
(Ⅰ)求证:
平面
;
(Ⅱ)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c9d5c0b9d7b7cf3e14f56bc3b4ac2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b70e550fa3c5aaf1b9c28f36fd5ed5d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/24/d5335cbd-3757-4f41-9e8a-62b36a27ca75.png?resizew=179)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64cf9f23e7387368e0449d7ebd8b68c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
(Ⅱ)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a16bf5f6ff59b99d22e9f1021095b0a.png)
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【推荐3】正方体
,
,E为棱
的中点,AC与BD交于点O.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/1ae0ffef-9173-4bf8-81f8-ae50dd43725e.png?resizew=139)
(1)求证:
平面
(2)求证:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92535536bd3c2761724fd058427f95a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/1ae0ffef-9173-4bf8-81f8-ae50dd43725e.png?resizew=139)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6466188b687a4dc824615354936bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c607775591ff90104cc9c6ce07f919.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9316e2161555c8ca09c5f6553b115ef7.png)
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【推荐1】正三棱柱
所有棱长为2,
为
中点
![](https://img.xkw.com/dksih/QBM/2022/7/18/3025156729176064/3026835958046720/STEM/642e8718e2c6450dba3bf7e0f3ed55ed.png?resizew=208)
(1)求证:
;
(2)若
,求
与平面
所成的角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47c88d4954b9a1e1f3861ffa0dfef9cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2022/7/18/3025156729176064/3026835958046720/STEM/642e8718e2c6450dba3bf7e0f3ed55ed.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d617a13ff4ca3fb256a1fad9e43a26d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e98805642426dae5bbdceedeb1aa3fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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【推荐2】如图,四边形
是等腰梯形,且
,
,
,四边形
是矩形,
,点
为
上的一动点.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418142341513216/2418901952872448/STEM/f0a9cc290cfb461b9288fac49985c107.png?resizew=270)
(1)求证:
;
(2)分别记四棱锥
与三棱锥
的体积为
,
,当点
为
的中点时,求
的值.
![](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/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfffb1bb2a0149fd015455440106e7e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbc56d42b003cbcb1fbe5c50e55b26b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e68633cbbe3cc2d0801305f81a7aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418142341513216/2418901952872448/STEM/f0a9cc290cfb461b9288fac49985c107.png?resizew=270)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed46a014ece6a0830c7c8b8deb2c56e0.png)
(2)分别记四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd31446f0b19bc6195352fcf21207d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fea520be511f0bca09d795851b0fa0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
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