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Author:
肖昆明
GeoGebra
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異分母分數減法
兩位數除以一位數（二）
判斷球體
第八周作业
兩位數除以一位數（一）
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三角
垂心的動畫
進步公式
旁心
达芬奇椭圆仪
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Similar Triangles
Conditional Probability
Triangles
Fractal Geometry
Solids or 3D Shapes