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happy new year2
Author:
李春培
happy new year2
GeoGebra
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算柱 (兩位數)
画直线等分三角形的面积
拼砌四邊形
球體建築師
三位數除以一位數（一）
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這是什麼角？
正弦定理
二元一次方程式1
初中函数
平方求和V 庄皮春 (Pi-Chun Chuang)
Discover Topics
Exponential Functions
Pyramid
Isosceles Triangles
Differential Equation
Secant Line or Secant