如图,在五面体ABCDEF中,四边形ABCD是直角梯形,∠BAD=90°,BC
AD,AB=AF=BC=
AD=1,AF⊥平面ABCD,N,G分别为DF,CD的中点.
![](https://img.xkw.com/dksih/QBM/2021/4/3/2691745387814912/2808754837700608/STEM/e49c8d85-4350-4014-81e3-970b07ab1ae7.png?resizew=277)
(1)求证:NC
平面FAB;
(2)求三棱锥E﹣ACG的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2021/4/3/2691745387814912/2808754837700608/STEM/e49c8d85-4350-4014-81e3-970b07ab1ae7.png?resizew=277)
(1)求证:NC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895d6f710d5f67e1d4c7408d50d77281.png)
(2)求三棱锥E﹣ACG的体积.
20-21高一下·广西·阶段练习 查看更多[2]
广西钦州市第四中学2020-2021学年高一(体艺班)3月份考试数学试题(已下线)8.5 空间直线、平面的平行(精练)-2021-2022学年高一数学一隅三反系列(人教A版2019必修第二册)
更新时间:2021-09-15 18:09:15
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【推荐1】现有一张半径为
的圆形铁皮,从中裁剪出一块扇形铁皮(如图
阴影部分),并卷成一个深度为
的圆锥筒,如图
.
![](https://img.xkw.com/dksih/QBM/2019/9/19/2294070727278592/2294112038297600/STEM/69da0509-f654-4b41-a0df-59de4b6515ee.png?resizew=202)
(1)若所裁剪的扇形铁皮的圆心角为
,求圆锥筒的容积;
(2)当
为多少时,圆锥筒的容积最大?并求出容积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef959a420dc4a40d40e1960a68d1acce.png)
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![](https://img.xkw.com/dksih/QBM/2019/9/19/2294070727278592/2294112038297600/STEM/69da0509-f654-4b41-a0df-59de4b6515ee.png?resizew=202)
(1)若所裁剪的扇形铁皮的圆心角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6246d2d994460b7d275ddcc9687f283.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
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解答题-证明题
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【推荐2】如图,长方体
中,
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/2012/4/7/1570832315244544/1570832320667648/STEM/e1443962bd84470f94d6115b33a344b7.png?resizew=145)
(1)求证:直线
平面
;
(2)求证:平面
平面
;
(3)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212f4416ce8fcd69b531ceda6f6ebfbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59d7987d716d34f95f439f09317e30b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/2012/4/7/1570832315244544/1570832320667648/STEM/e1443962bd84470f94d6115b33a344b7.png?resizew=145)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be58b9f1bf193fd00d94476cd35b5f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/762af1c6ff7d271a0535f94db18e7980.png)
(3)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae1de3f5eb55a078a2dc8d2a585b86a.png)
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【推荐1】如图,在直三棱柱
中,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/7a096403-e09e-4693-be92-aecc0f275368.png?resizew=222)
(1)求证:
平面
;
(2)若
,求异面直线
与
所成的角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbdaa2495981cf1f87339efd7911f56f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/16/7a096403-e09e-4693-be92-aecc0f275368.png?resizew=222)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edcf19a7f0dd0cdf59516ae585025110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1be642ddd61c3ad26bcbe2dc42e3512.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
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解题方法
【推荐2】在如图所示的多面体中,四边形ABCD为正方形,A,E,B,F四点共面,且
和
均为等腰直角三角形,
.
![](https://img.xkw.com/dksih/QBM/2022/4/19/2961721173581824/2962876724363264/STEM/c78b875205b54c2eb20ec3c0dc64a16c.png?resizew=197)
(1)求证:直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
平面ADF;
(2)若平面
平面AEBF,
,点P在直线DE上,求AP与平面BCF所成角的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aaab1426cea05dd8fdfa4aed6e5c3e6.png)
![](https://img.xkw.com/dksih/QBM/2022/4/19/2961721173581824/2962876724363264/STEM/c78b875205b54c2eb20ec3c0dc64a16c.png?resizew=197)
(1)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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