如图为第七届国际数学教育大会会徽图案,它由一串直角三角形演化而成,其中
,
,
,…
,它可以形成近似的等角螺线,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3099f8cc466540af3229211d52578c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/831d529d6175f1584f83f490d0c8e40e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7476a4ed22feb4e3f7c82780e77e1d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0d99cff983882087206d5d20314c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26090849d542f8d8ed1856a0ad362ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f3099f8cc466540af3229211d52578c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/d9fbd3c2-93a4-43ae-8883-6fcc2e12b024.png?resizew=194)
更新时间:2020-01-18 23:59:17
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