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平行四边形个数
Author:
朱亮
Topic:
Parallelogram
GeoGebra
New Resources
四邊形的特性
找出對稱軸
球體建築師
異分母分數減法
兩位數除以一位數（一）
Discover Resources
正五角柱展開
Physics
畢氏樹
三角函数定积分的动态演示.许兴华数学
小立方体组合的三视图-立方体可任意拖动
Discover Topics
Plane Figures or Shapes
Centroid or Barycenter
Conic Sections
Fractions
Multiplication