直角梯形
,点
分别在
上,且
,现将梯形
沿
折起,使平面
与平面
垂直.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/c08bd3a0-94ec-4295-b622-31bcdd0023da.png?resizew=291)
(1)求证:
平面
;
(2)当
的长为何值时,二面角
的大小为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0af90a1e2bbebb93a70be0281f5ee32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037f8d27f3ac6a56a4fe228ad88ab6b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80a0e428cb894bfd09a6129a73ea4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9238757804254960bc40fa9d87065559.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/c08bd3a0-94ec-4295-b622-31bcdd0023da.png?resizew=291)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307807ee10071bafbe922eb18d2517d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f2ff8aae606dbc83ed086be4405c75.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894a171f4b92c437544ba372348f41c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
2012·河南郑州·一模 查看更多[1]
(已下线)2012届河南省郑州外国语学校高三下学期综合考试验收5理科数学
更新时间:2016-12-01 17:40:30
|
相似题推荐
解答题-问答题
|
适中
(0.65)
解题方法
【推荐1】如图,矩形
所在的平面垂直于
所在的平面,
,F为
的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629771260780544/2629819574616064/STEM/c305b79d-950c-47ac-a014-a6c5679c601e.png)
(1)证明:
平面
;
(2)若P为线段
上的动点,当
时,试确定点P的位置,并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbfa1a2af7e38d33634c462300df381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddc7897e3f49075943704f4dbef82e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629771260780544/2629819574616064/STEM/c305b79d-950c-47ac-a014-a6c5679c601e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31c34b18525831f3eda7bb90be0199b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3885cacdf37959876e78c2b2f43b88.png)
(2)若P为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d5ee2d6fcbcad17b69997ef0741d2d.png)
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【推荐2】已知四棱锥
,底面
为正方形,且
底面
,过
的平面与侧面
的交线为
,且满足
(
表示
的面积).
(1)证明:
平面
;
(2)当
时,二面角
的余弦值为
,求
的值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ee2d2c33f73571cb9e3b96276f1acc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49a131604d5c482ec8edb88e00687277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1c4ed7451103f0cbf14bb9ae219b43.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/18/24779f04-4ddc-4719-bb0f-da3ea8aab7bd.png?resizew=155)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa69a2247ad4d5231aa361349b12f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c66d99a6a8415ddad22bbed33b64cfb.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc4ba0f5fb4a61b67ce8f9984e6f7f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/206695fadf6ab817ae8650f47fbf65d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f687ee88f27e8fe32de9d2435b3241f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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解答题-证明题
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适中
(0.65)
解题方法
【推荐1】如图,在四棱锥P-ABCD中,
,
,P在以AD为直径的圆O上,平面ABCD⊥平面PAD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/30/e52ead3e-2be4-483b-b45a-7d84ec34c6fe.png?resizew=207)
(1)设点Q是AP的中点,求证:BQ
平面PCD;
(2)若二面角
的平面角的正切值为2,求三棱锥A-PCD的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fa53c962e3e34dedea0bedaecf69ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/30/e52ead3e-2be4-483b-b45a-7d84ec34c6fe.png?resizew=207)
(1)设点Q是AP的中点,求证:BQ
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780e6163118b7259daabd994d674761d.png)
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【推荐2】如图,在四棱锥
中,底面
为矩形,平面
平面
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/9630101e-3637-435f-b65a-1de14a518f01.png?resizew=208)
(1)证明:
平面
;
(2)若
,
,且
,
,求二面角
的余弦值.
![](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/e4aa9084b8fe0fe05c4388d1f835587b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9396a2523d078c7fafbdcf231a9e772d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/9630101e-3637-435f-b65a-1de14a518f01.png?resizew=208)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73c8c1d2ba6b29b301380a45dfbcdd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f8759991daa986ef2e729fb6170ccf.png)
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【推荐3】如图,在四棱锥
中,四边形
为平行四边形,其中
,
,
,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/156a71c3-35e1-4374-8c18-d4a2ffa7f4e8.png?resizew=181)
(1)证明:
平面
;
(2)若锐二面角
的余弦值为
,求该四棱锥的体积.
![](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/62974d34de3a12418d6b700420afd1b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900a8f4c8349e1c79e8dc31a493b5964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2951b9f77413d5f062acb300b09de1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/31/156a71c3-35e1-4374-8c18-d4a2ffa7f4e8.png?resizew=181)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若锐二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7d6e5be7914a224e94a7b7e409a79c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d74ef32584586ec4857acd0a3f4fe9.png)
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解题方法
【推荐1】如图,在三棱锥
中,底面BCD是边长为2的正三角形,
平面BCD,点E在棱BC上,且
,其中
.
为30°,求AB的长;
(2)若
,求DE与平面ACD所成角的正弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/864aec7b9cfafb79090d533c63df5c2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/540ccd15435aa2d59e809d6a28fb2467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca6d1c5eace748465b2dad5065f5111c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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【推荐2】如图,在四棱锥P—ABCD中,PA⊥平面ABCD,四边形ABCD为正方形,AB=4,PA=3,点A在PD上的射影为点G,点E在AB上,平面PEC⊥平面PDC.
![](https://img.xkw.com/dksih/QBM/2012/12/21/1571078270427136/1571078276030464/STEM/6c2db76300d149f5a2c9f2ffc5f076de.png)
(1)求证:AG∥平面PEC;
(2)求AE的长;
(3)求二面角E—PC—A的正弦值.
![](https://img.xkw.com/dksih/QBM/2012/12/21/1571078270427136/1571078276030464/STEM/6c2db76300d149f5a2c9f2ffc5f076de.png)
(1)求证:AG∥平面PEC;
(2)求AE的长;
(3)求二面角E—PC—A的正弦值.
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