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定周长的正多边形面积变化规律
Author:
张英华
Topic:
Area
GeoGebra
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【案例】2013年安徽高考15题
畫出對稱圖形
兩位數除以一位數（一）
算柱 (兩位數)
拼砌四邊形
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乘法表的自动练习
Vertex Form of Quadratic Functions(2) 二次函數的圖像：頂點式(2)
GGB基礎教學Reuleaux
p04 equidistant from two points
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Optimization Problems
Surface
Probability
Square
Pyramid