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GGB3
Author:
詠甯
GeoGebra
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四邉形 (四年級) 教師版
兩位數加法
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
四邊形的特性
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Apollonius Problem gergonne 2
How to reconstruct a quadrilateral farm to a triangular one with the same area?
分數乘法的副本
任意角的三角函数
HOMEWORK
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Centroid or Barycenter
Derivative
Pie Chart or Circle Chart
Circle
Upper and Lower Sum or Riemann Sum