解题方法
1 . 在矩形
中,
,
,
在
上运动,设
,将
沿
折起,使得平面
垂直于平面
,
长最小时
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/6cf42247-3218-44ec-95ab-c3e72cea5f4b.png?resizew=220)
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名校
解题方法
2 . 在
中,
,
,
,
为线段
上的一点(不与端点
重合),
交线段
于
(不与端点
重合),将
沿
向上折起,使得平面
垂直于平面
,则四棱锥
的体积的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab00e0cff0876c4183a47f1272cf9928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12eb814bb12c2e8d3c6de69a73e972ad.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/26/7a1020fc-ff74-4b18-b17f-b33496764f90.png?resizew=108)
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3 . 已知
是两个不同的平面,直线
是平面
,
外的一条直线,现有下列三个论断:①
;②
;③
.请以其中两个论断为条件,余下的一个论断作为结论,写出一个正确的命题:___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6d8dcd07ffe20d7b6241d50eed2f31.png)
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名校
4 . 已知四棱锥
中,平面
平面
,其中
为正方形,
为等腰直角三角形,
,则四棱锥
外接球的表面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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2019-09-29更新
|
441次组卷
|
2卷引用:四川省双流中学2019-2020学年高二上学期入学考试数学(文)试题
5 . 在
中,已知
,
,
是斜边
上任意一点(如图①),沿直线
将
折成直二面角
(如图②).若折叠后
两点间的距离为
,则
的最小值为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87fd28b8b2bde9de5630a6106a6f762e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e781a2489271bfd1597cba1bb6f5887.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/77f76d8c-fda0-460a-9f62-ca3a0508aaa5.png?resizew=343)
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6 . 如图①,矩形
的边
,直角三角形
的边
,
,沿
把三角形
折起,构成四棱锥
,使得
在平面
内的射影落在线段
上,如图②,则这个四棱锥的体积的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e32513c66bca1e2d1706d50a6615df1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f491a794b9ac1a85a18c87ecee616c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/e366bb90-4114-4079-933e-40f0df2bbf0c.png?resizew=304)
您最近一年使用:0次
2019-06-20更新
|
840次组卷
|
4卷引用:四川省成都市新都一中等2018-2019学年高二(下)期末联考数学模拟试题
四川省成都市新都一中等2018-2019学年高二(下)期末联考数学模拟试题(已下线)狂刷33 空间几何体的表面积和体积-学易试题君之小题狂刷2020年高考数学(理)2020年普通高等学校招生全国统一考试 文科数学样卷(一)(已下线)第29练 空间点、线、面的位置关系-2021年高考数学(文)一轮复习小题必刷
名校
7 . 如图所示的几何体中,四边形
是矩形,平面
平面
,已知
,
,且当规定正视图方向垂直平面
时,该几何体的左视图面积为
,若
、
分别是线段
、
上的点,则
的最小值为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf9a6db3571fa57bfa2d5e4d44c51b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/8b86339a-ca30-47bf-930f-1f2e1c2332d2.png?resizew=149)
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18-19高一·全国·课后作业
8 . 如图所示,已知两个正方形ABCD和DCEF不在同一平面内,M,N分别为AB,DF的中点.若CD=2,平面ABCD⊥平面DCEF,则线段MN的长等于____ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/c8b00c3f-a8ff-4ceb-ba54-c01b46695f52.png?resizew=150)
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