如图,在四棱锥
中,
底面
,底面
是梯形,其中
,
,
与
交于点
,
是
边上的点,且
,已知
,
,
.
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/6dc4c0d1891a431b9e62126c5cd43400.png)
(1)求平面
与平面
所成锐二面角的正切;
(2)已知
是
上一点,且
平面
,求
的值.
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/49a6f09234564636b93240d487a7693c.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/0c243ca12f774235a5e54d84c0d4a081.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/7ae03d4e0c024545b4fdeb2f46174e7e.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/7ae03d4e0c024545b4fdeb2f46174e7e.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/fdc8bd39dddd41329a53e95021422eb4.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/4ba40b6b485045a99fc629217b7c0942.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/e28ddc1a12454662908d6d3ef66e62ea.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/0d7b9074a483495a8fb0253d80612dd0.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/b0a26727ba9244ada37cdfcc45d2726b.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/aed0ef1451cc4a9b955b00448c662144.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/3d006c911ac149f7807cc5eef7795e9d.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/b7e67d91fad04b04853b854d4ee833c2.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/1f7e351bbf584d3aa09744e3d4d0ee27.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/33c9102b5f9e4e0ca81f3178ed78ff5a.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/6f7a99c863f5487d9d6d6a8b0e5cc5ee.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/6dc4c0d1891a431b9e62126c5cd43400.png)
(1)求平面
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/4eae8ac521f3409ba34c46ed72a19f5e.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/7cccccb4aa7a42e5921755808efdf795.png)
(2)已知
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/064a1968570f4196848368cfbbe17756.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/ef3bd71924424ca9acd20f47b43d5a75.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/8132d8d0f4d14f2d8e280b0f8bc79fd3.png)
![](https://img.xkw.com/dksih/QBM/2015/6/19/1572132780638208/1572132786806784/STEM/880e70170f634d7a85235ba58882ea68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48458daf573dcfb15f1d78d39c243cf0.png)
更新时间:2016-12-03 14:22:36
|
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解答题-证明题
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适中
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【推荐1】如图,三棱锥P-ABC中,PA⊥平面ABC,AB⊥BC,D为PB的中点,E为PC的中点.
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081757696/STEM/d05384891b3645f1be79ec79725f677e.png)
(Ⅰ)求证:BC∥平面ADE;
(Ⅱ)若PA=AB=BC=2,求三棱锥A-BDE的体积.
![](https://img.xkw.com/dksih/QBM/2016/2/29/1572505075499008/1572505081757696/STEM/d05384891b3645f1be79ec79725f677e.png)
(Ⅰ)求证:BC∥平面ADE;
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解答题-证明题
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适中
(0.65)
名校
解题方法
【推荐2】如图,在四棱锥
中,
平面
,
,
,
,
, E为PD的中点,点F在PC上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/ca551637-980a-49cc-b8d0-20e7bfe56d93.png?resizew=174)
(1)求证:
平面
;
(2)设点G在PB上,且
.判断直线AG是否在平面AEF内,说明理由.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52a923784f083b7f4777891afe06b44e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88454ace46996b99361d18e76189cdc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/31/ca551637-980a-49cc-b8d0-20e7bfe56d93.png?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)设点G在PB上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557010ef2b20618df4771ac66daef18f.png)
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解答题-证明题
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【推荐1】如图,在三棱柱ABC-A1B1C1中,BB1⊥平面ABC,∠BAC=90°,AC=AB=AA1,E是BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/80160bc2-d47f-4b2a-90d0-9085e2e228e6.png?resizew=121)
(1)求证:AE⊥B1C;
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/80160bc2-d47f-4b2a-90d0-9085e2e228e6.png?resizew=121)
(1)求证:AE⊥B1C;
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解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,已知
是底面为正方形的长方体,
,
,点
是
上的动点
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/91aae9e6-34ef-4558-b606-90d6b533e84b.png?resizew=146)
(1)试判断不论点
在
上的任何位置,是否都有平面
垂直于平面
,并证明你的结论
(2)当
为
的中点时,求异面直线
与
所成角的余弦值;
(3)求
与平面
所成角的正切值的最大值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/489d8f964e1b16f6a9340fdab1a3b161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d125488e31956301c61d1ea1136f752.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/91aae9e6-34ef-4558-b606-90d6b533e84b.png?resizew=146)
(1)试判断不论点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57043f1d131e9c7c8b71bf8a68bacbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7253ffd3fc633d861810ee2e872188b6.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6655c413f509068d30b165f9d92bdba0.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24006d28116bc097933cc90bcc0ea69f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ec06f50894c259172c934481b196b2.png)
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