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陳允杰
GeoGebra
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拼砌四邊形
球体的体积推导
柱體建築師
判斷球體
四邉形 (四年級) 教師版
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waaachen
幾何鋪磚
Quiz on Solving Quadratic Inequalities 解二次不等式：測驗 (v2018)
七巧板
模拟时钟
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Frequency Distribution
Statistical Characteristics
Quadratic Equations
Piecewise Functions
Intersection