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異分母分數減法
找出對稱軸
錐體建築師
兩位數除以一位數（二）
兩組對邊相等的四邊形
Discover Resources
圓形與相似形
扇形概念與面積
Transit of Venus - Pentagram
旋转直角
拋物線3--平行四邊形法
Discover Topics
Solids or 3D Shapes
Rational Numbers
Geometric Transformations
Symmetry
Binomial Distribution