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俄罗斯方块（第二版）
Author:
孟宝兴
GeoGebra
New Resources
國旗 (作圖步驟直接餵給 Claude)
近似值：有效數字
美國國旗 (Codex 版)
兩組對邊相等和有直角的四邊形
判斷球體
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Apollonius Problem gergonne
圓族
test
circle
面积解题
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Mathematics
Coordinates
Matrices
Square
Parabola