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平行四邊形
Author:
李春培
Topic:
Parallelogram
GeoGebra
New Resources
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
錐體建築師
四邊形的特性
柱體建築師
Discover Resources
圓外一點到圓的距離
v中點座標軌跡(圓大正多邊形小)
grass eating
瓜豆原理——动点跟随
翰林數學_2下_CH4-1_截線與截角的意義
Discover Topics
Surface
Rational Numbers
Centroid or Barycenter
Normal Distribution
Arithmetic Mean