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反射定律 Law of Reflection
Author:
W.L. Wong, Albert
GeoGebra
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畫出對稱圖形
四邊形的特性
兩位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
【案例】2018年全国1卷理科12题
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畢氏樹
整數的減法
與三個半圓相切之圓的填滿
reflectional symmetry_4
空间立方体
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Natural Numbers
Symmetry
Linear Functions
Geometric Transformations
Arithmetic Operations