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1987全国文18
Author:
常振虎
GeoGebra
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兩位數除以一位數（二）
異分母分數減法
兩位數加法
兩位數除以一位數（一）
四邉形 (四年級) 教師版
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Geometry : Basic Elements (幾何： 基本元素)
Reflectionnn
circle
對稱圖形
手拉手模型
Discover Topics
Optimization Problems
Complex Numbers
Similar Triangles
Frequency Distribution
Fractal Geometry