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做一个等于一个已知角two ways bug
Author:
李英
GeoGebra
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算柱 (兩位數)
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
小数 的副本
找出對稱軸
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test test test
Clock
More about Function
包含除法（整數或分數 ÷ 分數）的副本
多边形的外角和
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Parametric Curves
Arithmetic
Tree Diagrams
Upper and Lower Sum or Riemann Sum
Rectangle