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1 . 如图,以正方形一边为斜边向外作直角三角形,再以该直角三角形的两直角边分别向外作正方形,重复上述操作(其中
),得到四个小正方形
,记它们的面积分别为
,则以下结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/275600c6-bdd1-40bb-a1b8-648a04b288ba.png?resizew=185)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aa9f89e08ecd078322a37521bd8e5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d21919c31c82e3bb78733605ef41255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55eb79b9b81488b1ded67b3eb43491cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/275600c6-bdd1-40bb-a1b8-648a04b288ba.png?resizew=185)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
您最近一年使用:0次
2022-10-19更新
|
656次组卷
|
5卷引用:云南省玉溪第一中学2023-2024学年高二下学期第一次月考数学试卷
2 . 在四棱锥
中,底面
是边长为
的正方形,
平面
,
,
分别是
的中点.则异面直线
与
所成角的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00803e67a5d417a9a4dc00277fca778b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8ed688f5fd14ef6e05beaa3b14eb300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c9fc300eb3c76c6d9d18a441a7a7e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
您最近一年使用:0次
2018-12-27更新
|
208次组卷
|
3卷引用:上海市高二数学下学期期末模拟试卷02--高二期末考点大串讲(沪教版2020选修)
3 . 在△ABC中,∠A、∠B、∠C所对的边a、b、c成等比数列.则
的取值范围是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c494328d30b8bd55d08ebd810f6106.png)
A.(0,+∞) | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次