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Author:
余銘芬
GeoGebra
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拼砌四邊形
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
異分母分數減法
判斷球體
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梯形面積---麥田圈
关灯游戏
最小周長
F.3 Ch.10 Application of Trigonometry
分数减法 Fraction Subtraction
Discover Topics
Statistical Characteristics
Reflection
Difference and Slope
Inequalities
Calculus