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正方形和長方形有甚麼特性？
Author:
Anthony OR 柯志明
Eng version:
http://ggbtu.be/m79823
GeoGebra
New Resources
兩位數除以一位數（二）
漂亮的摇摆曲线
平行線的斜率
祖冲之的期望：内棋与外棋
第八周作业
Discover Resources
Cactest
Ex5D#8
線的面化
学习计算器套件
黄冈中考16题(扇形滚动)
Discover Topics
Surface
Triangles
Centroid or Barycenter
Rotation
Addition