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echen say
Author:
dunst kang
Topic:
Mathematics
GeoGebra
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Nested spiral octagon
sanjiaohanshu
幾何作圖題:切三圓(題目)
三半圓間的相切圓(Codex╱2026.10.07)
Claude 解幾何題
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尤拉的介紹與尤拉線的證明
用向量找北极星
圓 點 直線 的複本
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