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一組物件的幾分之幾（練習）
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GeoGebra
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柱體建築師
異分母分數減法
球体的体积推导（优化版）
球體建築師
三位數除以一位數（一）
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相對位置的觀察
ex 4
國旗 做很久的
justin sin
倒水验证勾股定理
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Conditional Probability
Tangent Line or Tangent
Trigonometry
Congruence
Equilateral Triangles