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一組物件的幾分之幾（練習）
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GeoGebra
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四邉形 (四年級) 教師版
找出對稱軸
判斷球體
【案例】圆柱体内放置一个大球六个小球
異分母分數減法
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Ratio of angles at the centre and the length of the arcs.
相同圖形的拼砌（三角形）
分水問題
與三半圓相切之圓
畫圓
Discover Topics
Congruence
Triangles
Sine
Expected Value
Right Triangles