如图,在四棱锥
中,底面
是正方形.点
是棱
的中点,平面
与棱
交于点
.
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572517709578240/1572517715451904/STEM/1e90fcac06ab48bd8042e6a79549940c.png)
(1)求证:
;
(2)若
,且平面
平面
,试证明
平面
;
(3)在(2)的条件下,线段
上是否存在点
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
平面
?(直接给出结论,不需要说明理由)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2016/3/4/1572517709578240/1572517715451904/STEM/1e90fcac06ab48bd8042e6a79549940c.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c91baecb97fadd4f8ab49e6effcbc04.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f6967901d6c855864df01e7bf7a15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3321ddb3483d7576d719d5b929f9bd87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cac0572ffc70fbe6676edea45559904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(3)在(2)的条件下,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4237f6a1fc115bb790aa10704b7908c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
16-17高三上·北京朝阳·期末 查看更多[3]
更新时间:2016-12-04 03:18:23
|
相似题推荐
解答题-问答题
|
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(0.85)
解题方法
【推荐1】如图,在四棱锥
中,四边形
为平行四边形,
平面
,
为正三角形,
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/4a26131b-73e8-4c90-986e-7dafce0af9fb.png?resizew=221)
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
平面
;
(2)证明:
.
![](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/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/4a26131b-73e8-4c90-986e-7dafce0af9fb.png?resizew=221)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb31ef428bd9de9bc875b343feded3c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65277734669566578cbb7d690bb200fb.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d5ee2d6fcbcad17b69997ef0741d2d.png)
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【推荐2】如图,在底面为平行四边形的四棱锥
中,
,
平面
,且
,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/99d23c5c-829a-4380-b177-2244c5903ffe.png?resizew=276)
(1)求证:
;
(2)求证:
平面
;
(3)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.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/829f9180ddd9aa1a0ee0dc520f4e0b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/99d23c5c-829a-4380-b177-2244c5903ffe.png?resizew=276)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30067b7b236d17af8a462f96a58d11bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f4096ff62b4f29932cd8c6eef661a3.png)
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【推荐3】已知四棱锥
满足:四边形ABCD为正方形,△PAD为等边三角形,且平面PAD⊥平面ABCD,
,E为PA的中点.
平面BDE;
(2)求直线PC和平面ABCD所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2597b5554284e275367c25529c6750f.png)
(2)求直线PC和平面ABCD所成角的正切值.
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【推荐1】如图所示,在长方体ABCD-A1B1C1D1中,AB=1,BC=2,CC1=5,M是棱CC1上一点.是否存在这样的点M,使得BM⊥平面A1B1M?若存在,求出C1M的长;若不存在,请说明理由.
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【推荐2】如图,四边形ABCD为矩形,PA⊥平面ABCD,M,N分别是AB,PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/815d6f27-4f35-4ce4-9ce1-c03c4b6b6db2.png?resizew=206)
(1)求证:
平面PAD;
(2)试确定当△PAD中PA与AD满足什么关系时,MN⊥平面PCD?并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/815d6f27-4f35-4ce4-9ce1-c03c4b6b6db2.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27c571b6e58372ea55987e99825f6a4.png)
(2)试确定当△PAD中PA与AD满足什么关系时,MN⊥平面PCD?并说明理由.
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【推荐1】如图,正方体
的棱长为1,E,F是线段
上的两个动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/760ce406-4354-4748-bae8-c38cf1786997.png?resizew=163)
(1)若
平面
,求
的长度;
(2)若
,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/17/760ce406-4354-4748-bae8-c38cf1786997.png?resizew=163)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c8ccd4181f956f6e0140bf0ab8f0716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4f0e4c327b18dcd54245e68e7477998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
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【推荐2】在四棱锥P﹣ABCD中,底面是边长为2的菱形,∠BAD=60°,PB=PD=2,PA
,AC∩BD=O
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/901fff00-78f5-4b83-b04e-9828c26228ba.png?resizew=165)
(1)设平面ABP∩平面DCP=l,证明:l∥AB
(2)若E是PA的中点,求三棱锥P﹣BCE的体积VP﹣BCE.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88baedfc1deeee9e85138abddfdd000.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/901fff00-78f5-4b83-b04e-9828c26228ba.png?resizew=165)
(1)设平面ABP∩平面DCP=l,证明:l∥AB
(2)若E是PA的中点,求三棱锥P﹣BCE的体积VP﹣BCE.
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