名校
解题方法
1 . 如图中阴影部分是一个美丽的螺旋线型图案,其画法是:取正六边形
各边的三等分点
,
,
,
,
,
,作第2个正六边形
,然后再取正六边形
各边的三等分点
,
、
、
,
,
,作第3个正六边形
,依此方法,如果这个作图过程可以一直继续下去,由
,
,...构成如图阴影部分所示的螺旋线型图案,则该螺旋线型图案的面积与正六边形
的面积的比值趋近于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/b51aa374-6a39-4077-b602-b8c5ff9bae27.png?resizew=195)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6795cae2df43a722e1355e9562d93c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522230546d4b802094e86ceb48c2ba38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f1cd65c246e928ee9f3c79710648fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6f1cd65c246e928ee9f3c79710648fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c296e45b84cf67a98939aa7334e7d478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4f150ab98bde511e0f65d9bafab031.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ab715ab8650f8dc9d8b4f4d828f6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23deef700c7bcd70c9150a82c71f0843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cef36e87532cf0ccc350bbe29793fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/b51aa374-6a39-4077-b602-b8c5ff9bae27.png?resizew=195)
A.![]() | B.![]() | C.![]() | D.![]() |
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2023-05-14更新
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3卷引用:重庆市万州第二高级中学2023届高三三诊数学试题
2 . 龙曲线是由一条单位线段开始,按下面的规则画成的图形:将前一代的每一条折线段都作为这一代的等腰直角三角形的斜边,依次画出所有直角三角形的两段,使得所画的相邻两线段永远垂直(即所画的直角三角形在前一代曲线的左右两边交替出现).例如第一代龙曲线(图1)是以
为斜边画出等腰直角三角形的直角边
、
所得的折线图,图2、图3依次为第二代、第三代龙曲线(虚线即为前一代龙曲线).
、
、
为第一代龙曲线的顶点,设第
代龙曲线的顶点数为
,由图可知
,
,
,则
___________ ;数列
的前
项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473913c0887bb64d386f4c02f1853452.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7469dfbc8ceaec60ecf05a696e5ff7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b13a6e1d671215fc96e4bee3541d1096.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f92fbacd0a1a4a2f3f5094ece399e34.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a8eef8182b33a4f2514f87296d4a9b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899349213429760/2902165343936512/STEM/308c0d3c-6468-458e-bd4e-e1316e61bbf6.png?resizew=682)
您最近一年使用:0次
2022-01-25更新
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6卷引用:重庆市天星桥中学2022届高三上学期学业质量调研抽测(一)数学试题