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ie 4
Author:
LAM YU SANG
GeoGebra
New Resources
兩組對邊相等的四邊形
柱體建築師
拼砌四邊形
兩位數除以一位數（一）
異分母分數減法
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Sequence指令練習(逐一套疊正方形)
Diagram 1
霓虹燈
第14題
两角和的正弦公式几何证明（改进）
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Special Points
Parallelogram
Definite Integral
Distributions
Dilation