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孟宝兴
GeoGebra
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四邉形 (四年級) 教師版
判斷球體
三位數除以一位數（一）
四邊形的特性
畫出對稱圖形
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正弦定理
橢圓軌跡
FHMS Corr Angles on NonParallel Lines
quiz 9.1 2(a)
空间几何体的表面积和体积
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Hyperbola
Solids or 3D Shapes
Curve Sketching
Secant Line or Secant
Means