如图正方体
,棱长为1,
为
中点,
为线段
上的动点,过A、
、
的平面截该正方体所得的截面记为
.若
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffa35373ec4e4684107b42adb7a5161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f36a6370254d829ad191cb5727ea32f.png)
A.当![]() ![]() |
B.当![]() ![]() |
C.当![]() ![]() |
D.当![]() ![]() ![]() |
22-23高一下·海南省直辖县级单位·期中 查看更多[3]
海南省琼海市嘉积中学2022-2023学年高一下学期5月期中考试数学试题(已下线)专题11 空间几何体的截面问题 每日一题(已下线)第13章 立体几何初步 章末题型归纳总结 (2)-【帮课堂】(苏教版2019必修第二册)
更新时间:2023-06-25 22:21:42
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解题方法
【推荐1】已知
中,角
,
,
所对的边分别为
,
,
,
,
,
是
上的点,
,以下结论中正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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A.若![]() ![]() ![]() |
B.当![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
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【推荐2】已知点
是平行四边形
所在平面外一点,
,
,
,下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90a2ef53ce9758da75b395d4986eb89d.png)
A.![]() | B.存在实数![]() ![]() |
C.![]() ![]() | D.四边形![]() ![]() |
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【推荐1】在
中,内角A,B,C的对边分别为a,b,c,且
的面积为1,下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.若![]() ![]() ![]() | B.若![]() ![]() ![]() |
C.若![]() ![]() | D.若![]() ![]() |
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【推荐2】已知
的内角
,
,
的对边分别为
,
,
,则下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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A.若![]() ![]() |
B.若![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() |
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【推荐1】在棱长为1的正方体
中,M为底面
的中心,
,
,N为线段AQ的中点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb6bf23a5a12e1ba5413594d7b1a57c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/8/5eea9920-9c17-4fda-a490-57d64c73c10e.png?resizew=154)
A.CN与QM共面 |
B.三棱锥![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
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【推荐2】如图,在棱长为2的正方体
中,E、F分别是棱
、
上的动点,且
,则下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2023/12/21/3394131356639232/3394217795362816/STEM/4fef80ccaf0b4f1e9685f8b7a7962e33.png?resizew=182)
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A.![]() ![]() ![]() |
B.平面![]() ![]() |
C.三棱锥![]() |
D.当E、F分别是棱![]() ![]() ![]() ![]() |
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