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12-4-2-惠更斯原理2-平面波-尤景汉
Author:
王翚
GeoGebra
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球体的体积推导（优化版）
拼砌四邊形
算柱 (兩位數)
異分母分數減法
四邊形的特性
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對稱
sine graph 變換 with examples
圓方程式
一數的百分之幾是多少？
畢氏定理圖證01
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Quadrilaterals
Linear Regression
Histogram
Optimization Problems
Angles