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教学素材：正切函数及其反函数
Author:
清风拂琴，陌上花开
GeoGebra
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兩組對邊相等和有直角的四邊形
柱體建築師
異分母分數減法
畫出對稱圖形
算柱 (兩位數)
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Quiz on Solving One-step Linear Equations (1) | 解「一步」一次方程：測驗(1)
三角形外心
Example 4
正方体展开图的副本
包含除法（整數或分數 ÷ 分數）的副本
Discover Topics
Rotation
Numbers
Congruence
Statistics
Scalene Triangles