1 . 如图,正方体
的棱长为1,
分别为棱
,
的中点,则三棱锥
的体积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/2f52d163-25b4-449a-a132-2dea716fda19.png?resizew=173)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499b4619511ea9fb89a7bdf8d8fb20fa.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/2f52d163-25b4-449a-a132-2dea716fda19.png?resizew=173)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-12-26更新
|
546次组卷
|
2卷引用:2022年9月《浙江省新高考研究卷》(全国I卷)数学试题(五)
名校
解题方法
2 . 如图,等腰直角三角形
的斜边
为正四面体
的侧棱,直角边
绕斜边
旋转,则在旋转的过程中,有下列说法:
①四面体
的体积有最大值和最小值;
②存在某个位置,使得
;
③设二面角
的平面角为
,则
.
正确命题的序号是
______
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c09afc70f448545336304333d5b5658b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2020/8/2/2519171913875456/2519201541398528/STEM/50937ca6-efb1-4a30-8a50-15654f76583c.png?resizew=304)
①四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42020cfacd62b300cad053981bab9e0b.png)
②存在某个位置,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
③设二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d87b527147cb8dbb475bcefc0da2e6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3df1d9dcf1be61e7fa0d74ca9b70a5bc.png)
正确命题的序号是
![](https://img.xkw.com/dksih/QBM/2020/8/2/2519171913875456/2519201541398528/STEM/ef9cda5e20f14506b80f1156c04792cf.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2020/8/2/2519171913875456/2519201541398528/STEM/59c46a42695d43f681dd46f89bc2aa44.png?resizew=13)
您最近一年使用:0次
2020-08-02更新
|
629次组卷
|
3卷引用:浙江省宁波市效实中学2020届高三下学期6月高考模拟数学试题
浙江省宁波市效实中学2020届高三下学期6月高考模拟数学试题(已下线)练习5 2021年高考数学二轮小题专练(新高考)安徽省阜阳市太和第一中学2020-2021学年高二(奥赛班)上学期开学考试数学试题
名校
3 . 边长为1的正方体
的棱上有一点P,满足
,则这样的点共有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca718b9a7942c94066d540c8984c74c.png)
A.6个 | B.9个 | C.12个 | D.18个 |
您最近一年使用:0次
2018·浙江·模拟预测
解题方法
4 . 四个同样大小的球
,
,
,
两两相切,点
是球
上的动点,则直线
与直线
所成角的正弦值的取值范围为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75c8942e253abf1f64b09fa7d83b9e77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a578faf7b7efa9bd5d81fb6c37d1cb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994f88923da7a6a8d1a5342821d61f96.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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