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面積4
Author:
katetang511
GeoGebra
New Resources
拼砌四邊形
算柱 (兩位數)
兩組對邊相等的四邊形
兩位數除以一位數（二）
四邉形 (四年級) 教師版
Discover Resources
三角形三內角和為 180°
gjh-h04-01 多個堆疊的直角三角形
正多邊形邊上點旋轉
轉彎的文字
凸多边形在直线上的滚动
Discover Topics
Upper and Lower Sum or Riemann Sum
LCM and GCD
Confidence Interval
Optimization Problems
Means