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Author:
Antony Chan
Testing 2 (Addition of vectors)
GeoGebra
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算柱 (兩位數)
兩位數除以一位數（一）
拼砌四邊形
判斷球體
兩位數加法
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階梯問題
梯形旋轉
图案A
內外角平分線的副本
小五_近似值
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Trapezium
Similar Triangles
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Equations
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