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正三角形
Author:
陳幽靈
Topic:
Equilateral Triangles
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兩位數除以一位數（二）
拼砌四邊形
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
找出對稱軸
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我的作法
Relationships between chords and their distances from centre
圈圈移動
拋物線與圓的最短距離
時距計算機
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Addition
Tangent Function
Similar Triangles
Division
Upper and Lower Sum or Riemann Sum