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quiz 9.1 2(a)
Author:
lamanleung
GeoGebra
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兩位數除以一位數（二）
柱體建築師
找出對稱軸
球體建築師
兩組對邊相等的四邊形
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waaachen
三角形的分割與組合(2)
it's for fun
Geometry: Types of Angles 2 (幾何：角的種類 2)
割补法
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Variance
Derivative
Normal Distribution
Conditional Probability
Symmetry