已知矩形ABCD中,
,
,M,N分别为AD,BC中点,O为对角线AC,BD交点,如图1所示.现将
和
剪去,并将剩下的部分按如下方式折叠:沿MN将
折叠,并使OA与OB重合,OC与OD重合,连接MN,得到由平面OAM,OBN,ODM,OCN围成的无盖几何体,如图2所示.
;
(2)求此多面体体积V的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4807ca16360c0cca436e59d4be98f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a856daab95822013df31b1dd454e7696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ed01d1ff5a7f21a68fb3a1e5c7f393e.png)
(2)求此多面体体积V的最大值.
23-24高三上·四川成都·开学考试 查看更多[4]
四川省成都市第七中学2024届高三上学期入学考试文科数学试题(已下线)考点16 立体几何中的最值问题 2024届高考数学考点总动员【练】(已下线)第15讲 8.6.3平面与平面垂直(第2课时)-【帮课堂】(人教A版2019必修第二册)(已下线)第29题 立体问题常思降维化平面,几何最值莫忘函数不等式(优质好题一题多解)
更新时间:2023-09-01 14:44:58
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相似题推荐
解答题-证明题
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适中
(0.65)
【推荐1】如图,在四棱锥
中,
//
,
,
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a0cc1a450f1f05c5621efdf00b0f91.png)
平面
,点
在棱
上.
(1)求证:平面
⊥平面
;
(2)若直线
//平面
,求此时三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecbb2dce15f3d0fe839688575d2a8ff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923718ac7b296dd2c3b5b1d8ea0c3b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a0cc1a450f1f05c5621efdf00b0f91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/6/c1142ec4-b498-4904-a1a1-1b72cf935f2a.png?resizew=185)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af29254fe60a392c249c5791279e9c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e76f6552e20faeba98588e9b5dd01f6e.png)
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名校
【推荐2】如图,在三棱锥
中,底面
为等边三角形,
,
,且平面
平面
.
(1)求三棱锥
的体积;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a665ba024f2840ce5aef3765249341.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/12/aefa5dcc-8443-42b9-828b-954d68f291a1.png?resizew=159)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e820aec9c1a975242fe6d76408a9cde8.png)
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【推荐1】如图①,在直角梯形ABCD中,AB⊥BC,BC∥AD,AD=2AB=4,BC=3,E为AD的中点,EF⊥BC,垂足为F.沿EF将四边形ABFE折起,连接AD,AC,BC,得到如图②所示的六面体ABCDEF.若折起后AB的中点M到点D的距离为3.
(2)求六面体ABCDEF的体积.
(2)求六面体ABCDEF的体积.
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名校
【推荐2】下图是一个奖杯的三视图(单位cm,
取
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(1)请你说明这个奖杯是由哪些基本几何体组成的;
(2)求这个奖杯的体积;
(3)求这个奖杯的表面积.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94eecd59161d1a8dadbbef5184a628d3.png)
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(1)请你说明这个奖杯是由哪些基本几何体组成的;
(2)求这个奖杯的体积;
(3)求这个奖杯的表面积.
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适中
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【推荐1】如图,四棱锥
中,
,
为
的中点,
且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/7f9518bc-5d8b-4d2f-abb3-4f0876bb52c4.png?resizew=192)
(1)证明:
平面
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(2)求平面
与平面
夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a9ec3b527947cad9caa4537e0cb7e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bf5db8df084b9d1c55c6038a2f2823.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b092934ebc48422434232d474cb7c9c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/7f9518bc-5d8b-4d2f-abb3-4f0876bb52c4.png?resizew=192)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
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【推荐2】如图所示,正方形
所在平面与梯形
所在平面垂直,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/a25c7a7e-6fbe-4e2a-8491-a07077838946.png?resizew=219)
(1)证明:
平面
;
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与平面
所成角的正弦值;
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上是否存在一点
,使得二面角
的余弦值为
,若存在求出
的值,若不存在,请说明理由.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02b1139e07e431b5d4276757b232bad.png)
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(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23ea3d098fae87d8a2adc3f9913d8a6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfe67036b4671b5d2a5c55b48c4d3bb9.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c52b0a12e4770a56f6fc747976f4cd7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
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解答题-证明题
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适中
(0.65)
【推荐3】三棱柱
中,
为
中点,
.
平面
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f8e5d91f9c6a7ff6ca876995a221bf5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b94e97d085cea077cb82a0b7d2f523e.png)
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