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play tennis
Author:
李春培
play tennis
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
兩位數加法
兩組對邊相等的四邊形
三位數除以一位數（二）
四邉形 (四年級) 教師版
Discover Resources
代數
parallelgram with height 20120319
平面幾何
四面體 ABCD, AB 與 CD 距離
与两圆都相切的动圆圆心的轨迹
Discover Topics
Pythagoras or Pythagorean Theorem
Confidence Interval
Stochastic Process or Random Process
Boxplot
Right Triangles