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外公切線段長求法
Author:
謝易達
GeoGebra
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四邉形 (四年級) 教師版
畫出對稱圖形
異分母分數減法
兩組對邊相等和有直角的四邊形
球体的体积推导
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橫斷式研究之樣本數估計（Outcome為odds ratio）
正弦函数图像
平移法（三）
Ex5D#5
operations of matrix 2rd ver
Discover Topics
Combinatorics
Linear Equations
Natural Numbers
Quadratic Functions
Planes