已知
矩形ABCD所在平面,
,
为线段
上一点.
(1)当
为
的中点时,求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca05c4bd9b71018fe62fd7c6b691facc.png)
(2)是否存在
使二面角
为
?若存在,求
,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7500d2f2e461fc7e9c495e2e1e208cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca05c4bd9b71018fe62fd7c6b691facc.png)
(2)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f4096ff62b4f29932cd8c6eef661a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6913c327ccb0c3133eb9fa51a67ccb93.png)
![](https://img.xkw.com/dksih/QBM/2011/11/17/1570356156825600/1570356162265088/STEM/c37652c53ad24b54b4ab55e7dd70cd4e.png?resizew=131)
2011·湖北·一模 查看更多[1]
(已下线)2012届湖北省部分重点中学高三第一次联考试题理科数学
更新时间:2016-12-01 02:00:42
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相似题推荐
解答题-证明题
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【推荐1】如图,已知四棱锥
的底面为直角梯形,
为直角,
平面
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/801f66aa-d82b-423f-b7e4-c3122e11fd3e.png?resizew=173)
(1)求证:
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95475bfc06e884754eb4a455c3f434e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6455ed204853f0db2d0cbe980361245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037b342a682cbd4241855a243da3c016.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/801f66aa-d82b-423f-b7e4-c3122e11fd3e.png?resizew=173)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a88dc7dc9cd668a57138e1ec71ea2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ad2563f18f321e5fcf4a9f5ba1fd26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/290a37874cd284fb1a8c864769ce50c9.png)
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【推荐2】如图,四边形
是圆柱
的轴截面,点
在圆柱
的底面圆周上,
是
的中点,圆柱
的底面圆的半径
,侧面积为
,
.
![](https://img.xkw.com/dksih/QBM/2011/6/3/1570233496920064/1570233502408704/STEM/f9b91b88aa444c02ad2fab914a8008a7.png?resizew=171)
(1)求证:
;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e20dfdb0533931453c63bf22419dbb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7798835dcf68ae8b8e61e2c38cf0839a.png)
![](https://img.xkw.com/dksih/QBM/2011/6/3/1570233496920064/1570233502408704/STEM/f9b91b88aa444c02ad2fab914a8008a7.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bad3d9422cf9c0b078900b3c507e87c.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1268d322e77220ab39f1ebda2f1923ba.png)
![](https://img.xkw.com/dksih/QBM/2010/5/21/1569740395085824/1569740400320512/STEM/e8d2350f22e546119bd79281a48d0c86.png?resizew=7)
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【推荐1】如图,边长为
的正方形
与梯形
所在的平面互相垂直,已知
,
,
,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/7074d48a-483c-48d1-a555-bed02f1ba874.png?resizew=164)
(1)证明:平面
平面
;
(2)判断点
的位置,使得平面
与平面
所成的锐二面角为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.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/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ebd104ea15fd2590ef39a831eabda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/7074d48a-483c-48d1-a555-bed02f1ba874.png?resizew=164)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7084fef1f20c7af36659c1faa643ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ecc1cb55a57dde481f8dd07ab150676.png)
(2)判断点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
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【推荐2】如图,直角梯形ABCD中,
,
,
,点E为CD的中点,
沿着AE翻折至
,点M为PC的中点,点N在线段BC上.
(1)证明:
平面PBC
(2)若平面
平面ABCE,平面EMN与平面PAB的夹角为30°,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810227b082bd14dbcde85c3181841571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/b90874d4-5def-427b-985a-f2944ad97051.png?resizew=316)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53569e6ec795658b4fffcddeebe0f142.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90d96357a07048ba79b8c84097d359d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48732e80ec3c3b6de906d598c69840d5.png)
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【推荐3】如图,将边长为2的正方形
沿对角线
折叠,使得平面
平面
,若
且
平面
.
![](https://img.xkw.com/dksih/QBM/2020/8/10/2525089370947584/2539843536797696/STEM/7f2901e4-478b-486c-bc95-405de9ddc8c7.png?resizew=222)
(1)证明:
平面
;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfaad4c4467e27421876d8f2a4371d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338c6c83ab4abc895ac36ab888a55be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://img.xkw.com/dksih/QBM/2020/8/10/2525089370947584/2539843536797696/STEM/7f2901e4-478b-486c-bc95-405de9ddc8c7.png?resizew=222)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/871221c3eaabb6d9b030ce91c7139709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/445b51117626fbd3373e32acc514c64b.png)
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