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畢氏定理
Author:
趙國亨
GeoGebra
New Resources
異分母分數減法
兩位數除以一位數（二）
拼砌四邊形
四邉形 (四年級) 教師版
球体的体积推导（优化版）
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題三
單項奇函數
拿破侖定理(內拿破侖)證明三
General Form of Quadratic Functions(2) 二次函數的圖像：一般式(2)
S5 2D Trigonometry
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Equations
Optimization Problems
Piecewise Functions
Percentages
Secant Line or Secant