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用和或差的平方做因式分解
Author:
鍾文欽
GeoGebra
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異分母分數減法
兩組對邊相等的四邊形
四邊形的特性
球体的体积推导（优化版）
球体的体积推导
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ghseh 二次函數描點法頂點式-1
棒形圖3
黄金螺线
[洋葱] 2019河北中考25 圆与四边形
Completing the Square (Part 3)
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Correlation
Intersection
Quadratic Functions
Secant Line or Secant
Rectangle