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陳隆期
GeoGebra
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異分母分數減法
拼砌四邊形
四邉形 (四年級) 教師版
兩位數加法
【案例】2013年安徽高考15题
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使用中
Geogebra 教學
蝴蝶定理
正八角錐(旋轉，實體、透視)
Lesson02 absolute value function
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Vectors
Geometry
Area
Normal Distribution
Quadratic Equations