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平行四邊形面積
Author:
陳隆期
GeoGebra
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畫出對稱圖形
三位數除以一位數（一）
拼砌四邊形
算柱 (兩位數)
兩位數除以一位數（二）
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排列
功課'
基本作圖2
配方法圖解
Quiz on Signs of Coefficients of Quadratic Functions 二次函數係數的正負號：測驗
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Dilation
Triangles
Cosine
Multiplication
Derivative