如图,四棱锥
的底面ABCD是平行四边形,
,
,
面
,设
为
中点,点
在线段
上且
.
(1)求证:
平面
;
(2)设二面角
的大小为
,若
,求
的长.
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/fbe2c93024cc4defbfd664d248c9f26b.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/dfbc51addab444a3a829a72863be52cd.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/882d788e0d574781b1594dc4601e5ec3.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/685c0c13d9b543ccb2abf857ba21f484.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/0f88a790965642b7bbd40dda123949cc.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/066cf30d2e9a4832ae21171d00faf2b5.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/31ca9d8f8e9b4da186f066541aa59eaf.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/29fd2392bfdb43eea30beb3d43441b56.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/17d0bfeb73964d6285dd9ccc81789d94.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/b3582d2246694bb6857ebdf05e0531a2.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/c61280d2722c4813b479568feb9fe407.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/d311c1e3123d4b8a80686aaf2c8c2b16.png)
(2)设二面角
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/8d05f983837848fa9266c355b68a62ec.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/deb1ec2b0dc944f5b9c7c266918e6e19.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/b391963284c348f493386694ee942773.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/47c7fdd31de043c5a115e358424e563a.png)
![](https://img.xkw.com/dksih/QBM/2014/7/2/1571806394687488/1571806400512000/STEM/d69f2e43a8ea4c0b901632955bcc2ed9.png)
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更新时间:2016-12-02 20:55:18
|
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解答题-证明题
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较难
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【推荐1】如图,在四棱柱
中,
,
,
为线段
的中点,
是线段
上的动点.
![](https://img.xkw.com/dksih/QBM/2019/12/6/2349514852253696/2350018631016448/STEM/3947dc1e32054264aaf727406d19300c.png?resizew=143)
(1)求证:
平面
;
(2)若
,且平面
平面
,求平面
与平面
所成角(锐角)的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ed7db168fb1cba377d17a80a9e4f26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec022e4a3e5e615e7117fd0c11aa4a97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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解答题-证明题
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【推荐2】如图,已知三棱柱ABC-A1B1C1的底面是正三角形,侧面BB1C1C是矩形,M,N分别为BC,B1C1的中点,P为AM上一点,过B1C1和P的平面交AB于E,交AC于F.
(2)设O为△A1B1C1的中心,若AO∥平面EB1C1F,且AO=AB,求直线B1E与平面A1AMN所成角的正弦值.
(2)设O为△A1B1C1的中心,若AO∥平面EB1C1F,且AO=AB,求直线B1E与平面A1AMN所成角的正弦值.
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解答题-作图题
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名校
【推荐3】已知四棱锥
的底面ABCD是平行四边形,侧棱
平面ABCD,点M在棱DP上,且
,点N是在棱PC上的动点(不为端点).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/3ca3f34b-c460-4557-a4c9-0502b91ee703.png?resizew=220)
(1)若N是棱PC中点,完成:
(i)画出
的重心G(在图中作出虚线),并指出点G与线段AN的关系:
(ii)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
平面AMN;
(2)若四边形ABCD是正方形,且
,当点N在何处时,直线PA与平面AMN所成角的正弦值取最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc85ce5e111acf7162b8e1b5a3f6b220.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/3ca3f34b-c460-4557-a4c9-0502b91ee703.png?resizew=220)
(1)若N是棱PC中点,完成:
(i)画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acee03d4bb4667b6c345221b6c9b0fa4.png)
(ii)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
(2)若四边形ABCD是正方形,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2304c541406034dd83040e9a7887ed7.png)
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解答题-证明题
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【推荐1】已知三棱柱
中,
平面
,
于点
,点
在棱
上,满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/22/9961f990-8600-4ab5-a73a-400803c0ec70.png?resizew=187)
若
,求证:
平面
;
设平面
与平面
所成的锐二面角的大小为
,若
,试判断命题“
”的真假,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbb07444f2ad69724fbaf87aa951b3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417f0273f9b9a48e688218b921246a44.png)
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解答题-证明题
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【推荐2】如图,在三棱锥
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f90318c1a8d868d69fba0e8ab960bfc.png)
,
,
,
点在平面
内,
,
.
(Ⅰ)求证:
平面
;
(Ⅱ)设点
在棱
上,若二面角
的余弦值为
,试求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f90318c1a8d868d69fba0e8ab960bfc.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0870247d35bf60ae14239f608da44759.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c1976b29312c9522c7856ed610c0a0d.png)
(Ⅰ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(Ⅱ)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84251c12be53e98689b0aef8144ff637.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64e76a4c1e5934f51cdca2ffbc8313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60b33b1b94b82e8972ae5c86de8ad66.png)
![](https://img.xkw.com/dksih/QBM/2017/5/10/1683941228077056/1683988839653376/STEM/af350ac3792d40178e03b1b80576c3f2.png?resizew=159)
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名校
【推荐3】已知△ABC是边长为6的等边三角形,点M,N分别是边AB,AC的三等分点,且
,
,沿MN将△AMN折起到
的位置,使
.
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941122016854016/2941973344141312/STEM/2e8e1f2861954c9687b97882d744e8d7.png?resizew=424)
(1)求证:
平面MBCN;
(2)在线段BC上是否存在点D,使平面
与平面
所成锐二面角的余弦值为
?若存在,设
,求
的值;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba486b7a12ec874644dc5fea93a56916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3a45b6f1348711bc6eabd87982c3756.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8e7040c2fd8a163d71e35805775feb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d938067915b0d59f491b4c8ee7a982.png)
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941122016854016/2941973344141312/STEM/2e8e1f2861954c9687b97882d744e8d7.png?resizew=424)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eedf1e774ce129d9a09f02ca1920052.png)
(2)在线段BC上是否存在点D,使平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4459d0d7b4c2e9e8106fe5b4520277e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34c932cfbb9fb63159a176a8f45489a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e108d5c61e85e0741ec2c484fc5768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2f0857ee6d2e3e5341bcc916f2e067.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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