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梯形堆垛
Author:
施奕瑄
GeoGebra
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兩組對邊相等的四邊形
四邉形 (四年級) 教師版
算柱 (兩位數)
兩位數加法
四邊形的特性
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範例
try_111
Constructing Quadrilaterals by Four Sides (2014)
真分數乘以真分數
椭圆第一定义
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Limits
Parametric Curves
Expected Value
Kite
Random Variables