如图,在三棱柱
中,
,
.
![](https://img.xkw.com/dksih/QBM/2022/6/20/3005515608031232/3007421490274304/STEM/460b1813006a40b892ed197776819035.png?resizew=253)
(1)证明:平面
平面
.
(2)设P是棱
上一点,且
,求三棱锥
体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fd31113c6f65e8b5ce30935f50df64c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29e8a1eefb6776168969a1155c9e9c5.png)
![](https://img.xkw.com/dksih/QBM/2022/6/20/3005515608031232/3007421490274304/STEM/460b1813006a40b892ed197776819035.png?resizew=253)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
(2)设P是棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3ed8c86401d4cce99cb51c3a25478c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b31232447a0b0b3e45a0e111c60e7f0.png)
2022·青海海东·模拟预测 查看更多[8]
青海省海东市第一中学2022届高考模拟(一)数学(文)试题贵州省黔东南苗族侗族自治州2021-2022学年高一下学期期末考试数学试题(已下线)专题28 空间几何体的结构特征、表面积与体积-3(已下线)7.2 空间几何中的垂直(精练)(已下线)专题31 直线、平面垂直的判定与性质-2(已下线)专题3 空间几何体的体积运算(提升版)(已下线)上海市静安区2023届高三二模数学试题变式题16-21广东省佛山市实验中学2024届高三上学期第五次月考数学试题
更新时间:2022-06-23 10:37:35
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【推荐1】在棱长均为
的正三棱柱
中,
为
的中点.过
的截面与棱
,
分别交于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/51b01625-bc3d-4e4c-9250-f2007a291167.png?resizew=137)
(1)若
为
的中点,求三棱柱被截面
分成上下两部分的体积比
;
(2)若四棱锥
的体积为
,求截面
与底面
所成二面角的正弦值;
(3)设截面
的面积为
,
面积为
,
面积为
,当点
在棱
上变动时,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/51b01625-bc3d-4e4c-9250-f2007a291167.png?resizew=137)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbad16d8800f6d55bd66bd64b1370e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f737b04ce09bc7e1ed86dc9b3c85203b.png)
(2)若四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd14590987d7987a02d856d427a2da44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e57f00c8225a33458a6b62bff0dcc16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbad16d8800f6d55bd66bd64b1370e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(3)设截面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f875de8bec0ffc84b8142f81080058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f562eb3c2a45d65cba066d712825a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646e45a7ffef530bc1d0bd8d4fc72127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8010362247509d238c552c670a3429b3.png)
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【推荐2】一个圆柱形圆木的底面半径为
,长为
,将此圆木沿轴所在的平面剖成两部分.现要把其中一个部分加工成直四棱柱木梁,长度保持不变,底面为等腰梯形
(如图所示,其中
为圆心,
,
在半圆上),设
,木梁的体积为
(单位:
),表面积为
(单位:
).
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572670277410816/1572670283112448/STEM/554a26c0-fcf6-4405-82fb-93caac6462f6.png?resizew=190)
(1)求
关于
的函数表达式;
(2)求
的值,使体积
最大;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167e6e41ac221847824a72e964f340f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11db4b9921a9fe4d5c03b17bafc852fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eab9bcb68861b73f12a65eb9e94700d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c901bcdfa58f0c68ad0161b0bab269.png)
![](https://img.xkw.com/dksih/QBM/2016/5/31/1572670277410816/1572670283112448/STEM/554a26c0-fcf6-4405-82fb-93caac6462f6.png?resizew=190)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
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【推荐1】如图所示,在四棱锥
中,
平面
,底面ABCD满足AD∥BC,
,
,E为AD的中点,AC与BE的交点为O.
(1)设H是线段BE上的动点,证明:三棱锥
的体积是定值;
(2)求四棱锥
的体积;
(3)求直线BC与平面PBD所成角的余弦值.
![](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/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d275c6da71f71deeb2ca07e5c04740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
(1)设H是线段BE上的动点,证明:三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63360ee144c8caaed4aea74e2058cc12.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
(3)求直线BC与平面PBD所成角的余弦值.
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【推荐2】如图,四边形
为正方形,四边形
为两个全等的等腰梯形,
,
,
,
.
(1)求二面角
的大小;
(2)求三棱锥
的体积;
(3)点N在直线
上,满足
,在直线
上是否存在点M,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
平面
?若存在,求出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00a1a119b87612fef0f0730d07bddf5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c197d8b99f2eb7477947e53461b5d548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6034301fc4110da89bdb0f46ad82ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/510b162030e04fab26e05fe268675c07.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/dbf8eb5c-e427-43da-8205-5ca0aa76852c.png?resizew=192)
(1)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a34e44c5d7e1d22521fb293994f5b0.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3b635e62c3b1f4a57feac8d22be84ee.png)
(3)点N在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a522e4844faa8573997feb74e45df81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3935b5b39d54577a64aa280accbb5fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7081090993015b5058f60ca45af968ae.png)
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【推荐1】如图,四棱锥
的侧面
是边长为2的正三角形,底面
为正方形,且平面
平面
,
,
分别为
,
的中点.
;
(2)在线段
上是否存在一点
使得
平面
,存在指出位置,不存在请说明理由.
(3)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/014c4c0d6c8e50e5c6c83e857f9ecac7.png)
(2)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8014e499e7852b587b3b36af14b7816.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d62de810f5160223afa54fd882acb9b.png)
(3)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c80c2240af31b07857eaac003b3d8132.png)
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解题方法
【推荐2】如图,菱形
的边长为2,
,E为AB的中点.将
沿DE折起,使A到达
,连接
,
,得到四棱锥
.
(1)证明:
;
(2)当二面角
的平面角在
内变化时,求直线
与平面
所成角的正弦值的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be7527d873655c33ebcd1f2b14a9315c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/908113cb-163c-495f-aae7-ae6df02c1f28.png?resizew=240)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb50274e8907ba8ba624755c9f3462d3.png)
(2)当二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413057311afa5daa3815d4afd08dd3a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b5e354bb26ff35ea03241c4fdff96b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c87014fbb5c656a4f1892dbd88f242.png)
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【推荐1】在几何体
中,底面
为菱形,
,
与
相交于点
,四边形
为直角梯形,
,面
面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/1078c6f3-7694-4894-b3c2-a504044d3063.png?resizew=147)
(1)证明:面
面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d581df3ebeb3cd23dd8a7bef2c8a798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8888155ede05d8fba503b5f3665c5edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1b6711e6dd48be6cf8fa52926924d21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/1078c6f3-7694-4894-b3c2-a504044d3063.png?resizew=147)
(1)证明:面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a0d238b6e9b49bbea22a79402e8e4f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c9c2c831a0552a7c934365bc49ad3f.png)
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【推荐2】如图,三棱锥
,
均为底面边长为
、侧棱长为
的正棱锥,且四边形
是边长为
的菱形(点
在平面
的同侧),
交于点
.
![](https://img.xkw.com/dksih/QBM/2020/12/15/2614849631830016/2619044939759616/STEM/8fb7ca49-92d8-407c-92aa-2383d1ba9568.png)
(1)证明:平面
平面
;
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfe0ccf24d760c77535a70c92dad145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a4ccef06bd7c89746239123517347c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f83dbfddc6f98548699ed581e8c8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2020/12/15/2614849631830016/2619044939759616/STEM/8fb7ca49-92d8-407c-92aa-2383d1ba9568.png)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61259bb537ac8eb81986f45d60555733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee188333e1fa99417aede565c6a4a136.png)
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