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2.2
Author:
李岱融
GeoGebra
New Resources
画直线等分三角形的面积
兩位數除以一位數（二）
三位數除以一位數（一）
兩位數加法
兩組對邊相等和有直角的四邊形
Discover Resources
平行四邊形的面積
Addition / Subtraction of 3 Directed Numbers
拋物線
数学分析讲义
割补法
Discover Topics
Upper and Lower Sum or Riemann Sum
Geometric Transformations
Line Segment
Isosceles Triangles
Straight Lines