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[洋葱] 平行线分线段成比例(0530)
Author:
acchu
GeoGebra
New Resources
異分母分數減法
找出對稱軸
算柱 (兩位數)
拼砌四邊形
球体的体积推导（优化版）
Discover Resources
折射率的定義
小学数学
切割線性質
球體體積圖解
连续开方（制作：谢建华，修订：孟宝兴）
Discover Topics
Straight Lines
Surface
Optimization Problems
Functions
Upper and Lower Sum or Riemann Sum