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凹凸透镜对平行光线的作用
Author:
李大地(Field Lee)
GeoGebra
New Resources
找出對稱軸
四邊形的特性
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
三位數除以一位數（一）
Discover Resources
Sequence指令練習(圓面積的展開)
Integer
test book
二進位翻牌
HOMEWORK
Discover Topics
Secant Line or Secant
Subtraction
Division
Geometric Distribution
Ratios