名校
1 . 已知正四面体
的棱长为1,
为棱
的中点,则二面角
的余弦值为_______________ ;平面
截此正四面体的外接球所得截面的面积为____________ .
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96fe44cb45b52ade75574ed31d05fb26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2f0df53aa68c9c334165034788166.png)
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2020-10-17更新
|
775次组卷
|
5卷引用:浙江省十校联盟2020-2021学年高三上学期10月联考数学试题
浙江省十校联盟2020-2021学年高三上学期10月联考数学试题广东省梅州市蕉岭中学2021-2022学年高二上学期入学测试数学试题福建省福州第三中学2023届高三上学期数学一轮复习质量模拟检测试题江苏省镇江中学2023届高三下学期3月大练2数学试题(已下线)第四章 立体几何解题通法 专题二 升维法 微点1 升维法(一)【培优版】
2 . 在三棱柱
中,
,
,
两两垂直,且
,点
在侧面
内(含边界),若
,则
长度的最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d0bcf50b83ad901801229c0e85a660.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ec2dc9d535fca4380e89f606dadb95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b930328eabbf461a53ee2b5a9546cc.png)
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2020-08-15更新
|
299次组卷
|
2卷引用:河南名校联盟基础年级联考2019-2020学年高一下学期期末考试数学
名校
解题方法
3 . 空间内有三条直线,其中任意两条都不共面但相互垂直,直线
与这三条直线所成角皆为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85527d190d4e1d6bac4145d1c716e65e.png)
A.![]() | B.![]() | C.1 | D.直线![]() |
您最近一年使用:0次
解题方法
4 . 已知正方体
的棱长为a.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/f86306c9-4a1b-447a-bbb7-0e291f9546c3.png?resizew=159)
(1)求点
到平面
的距离;
(2)求平面
与平面
所成的二面角(结果用反三角函数值表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/f86306c9-4a1b-447a-bbb7-0e291f9546c3.png?resizew=159)
(1)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fae7f4612c548b1f72a964ddb291cd2e.png)
您最近一年使用:0次
5 . 图(1)为棱长为1的正方体,若正方体内有两个球相外切且又分别与正方体的三个面相切,则两球半径之和为________ .
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388347691089920/2389133032382464/STEM/9ca43f48-9249-43c8-abb7-a1fd77aec900.png?resizew=155)
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388347691089920/2389133032382464/STEM/9ca43f48-9249-43c8-abb7-a1fd77aec900.png?resizew=155)
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388347691089920/2389133032382464/STEM/21acc930-eade-4872-b32c-d0c3ff826e19.png?resizew=189)
您最近一年使用:0次
2020高二·浙江·专题练习
6 . 已知正四面体
中,
为棱
的中点,设
是
(含边界)内的点,若点
到平面
,平面
,平面
的距离相等,则符合条件的点
( )
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45504031c84b187f9c6324622415ea22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
A.仅有一个 | B.有有限多个 | C.有无限多个 | D.不存在 |
您最近一年使用:0次
2020高二·浙江·专题练习
名校
7 . 如图,半径为1的
平面
,
平面
.直线
,且直线
和
相切,若
,则点
到直线
的距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8929b5d347420bd8730946e7b6a408.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e126c16032892966489053f44b9048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1754786a3367aca3da18ee3316e5b968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634e91a3d04eb1b522444cb2378c05da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/0f71ad0c-cd1e-4c29-8678-feeb92a0ff26.png?resizew=193)
您最近一年使用:0次
2020-01-04更新
|
222次组卷
|
3卷引用:【新东方】杭州高二数学试卷245
名校
8 . 有一个底面半径为3,轴截面为正三角形的圆锥纸盒,在该纸盒内放一个棱长均为a的四面体,并且四面体在纸盒内可以任意转动,则a的最大值为________ .
您最近一年使用:0次
9 . 如图,已知平面α⊥平面β,α∩β=l,A∈l,B∈l,AC⊂α,BD⊂β,AC⊥l,BD⊥l,且AB=4,AC=3,BD=12,则CD=______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/ea4ea843-04fe-4529-8cb5-1d325f364803.png?resizew=191)
您最近一年使用:0次
名校
10 . 如图所示,正方体
的棱长为
,延长
至
,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/8fd5585c-5520-46b9-9117-04d21f0ba5de.png?resizew=144)
(1)经过
作正方体的截面图形;
(2)求出截面为底面
为顶点的多面体的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3334853138fb74687d66b1e45f2fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80a56e503b98a5cbe7a4600d8f8d9d32.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/8fd5585c-5520-46b9-9117-04d21f0ba5de.png?resizew=144)
(1)经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99f488b85184d4e9d5fc9ccd0cfda8c5.png)
(2)求出截面为底面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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