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外凸的正方形
Author:
许业成
GeoGebra
New Resources
異分母分數減法
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
兩位數加法
兩位數除以一位數（一）
Discover Resources
圓&五邊形
Normal Distribution
Archimedean spiral
李樂雯_尋找PI的活動
加法002结果(20以内)
Discover Topics
Exponential Functions
Triangles
Vectors
Sine
Standard Deviation