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中华人民共和国国旗
Author:
孟宝兴
GeoGebra
New Resources
兩位數除以一位數（二）
四邉形 (四年級) 教師版
畫出對稱圖形
【案例】2018年全国1卷理科12题
判斷球體
Discover Resources
商高定理之正三角形2
World's Hardest Easy Geometry Problem.
滾動的圓
zentangle
分段函数和旋转曲面
Discover Topics
Unit Circle
Fractal Geometry
Standard Deviation
Scalene Triangles
Upper and Lower Sum or Riemann Sum