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Author:
Ricky Chan
GeoGebra
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四邊形的特性
画直线等分三角形的面积
算柱 (兩位數)
兩位數除以一位數（二）
第八周作业
Discover Resources
latex 的東西
平行四邊形與菱形的分別
教學－面與面的夾角
Copy of area
bang
Discover Topics
Natural Numbers
Quadratic Functions
Binomial Distribution
Distributions
Triangles