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余弦定理的证明
Author:
john arnold
GeoGebra
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兩組對邊相等和有直角的四邊形
異分母分數減法
【案例】2013年安徽高考15题
兩位數除以一位數(二)
錐體建築師
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分數加法和減法
百分數的應用
認識時鐘
黃金矩形
串珠(兩種顏色)
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Mode
Calculus
Hypothesis Testing
Diagrams
Vectors 2D (Two-Dimensional)