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圆扇形展开（解释面积公式）
Author:
朱亮
GeoGebra
New Resources
sanjiaohanshu
畫出對稱圖形
三位數除以一位數（一）
判斷球體
算柱 (兩位數)
Discover Resources
趙緹的GGB繪本
YIPPUIMEIgeogebra
真分數乘以真分數
立體圖
第一个绘本
Discover Topics
Cylinder
Tree Diagrams
Secant Line or Secant
Limits
Scalene Triangles