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Author:
enming
GeoGebra
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兩組對邊相等的四邊形
拼砌四邊形
画直线等分三角形的面积
三位數除以一位數（二）
兩位數除以一位數（一）
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判斷柱體11
三平行線上作正三角形
directed number_the age of father and son
gjzbh 矩陣與遞迴關係（3階）
贪吃蛇（第一版）
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Hypothesis Testing
Kite
Sine
Percentages
Linear Programming or Linear Optimization