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同旁內角---水平平行綫
Author:
chanfushun
GeoGebra
New Resources
球体的体积推导（优化版）
四邊形的特性
異分母分數減法
球体的体积推导
找出對稱軸
Discover Resources
緯度、日照、影長
立體圖形 KH
尺規作圖
二元线性规划的图解法(18.2 例6)
勾股定理的直观证明（义务教育数学 新课标-例82）
Discover Topics
Quadratic Functions
Pythagoras or Pythagorean Theorem
Addition
Confidence Interval
Symmetry