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面積題 B
Author:
spkwan
GeoGebra
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兩位數加法
異分母分數減法
三位數除以一位數（二）
算柱 (兩位數)
找出對稱軸
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Chapter02
Progressive Formula
Logarithmic spiral
数学涂鸦
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Logarithm
Coordinates
Geometric Mean
Volume
Angles