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图案A
Author:
吉顺国
GeoGebra
New Resources
兩組對邊相等的四邊形
畫出對稱圖形
四邉形 (四年級) 教師版
【案例】圆柱体内放置一个大球六个小球
第八周作业
Discover Resources
七巧板
Copy of 閱讀鐘面及數字鐘（時和分）
高斯定理：對角線中點共線
讀磅 (練習)
Ex5C#15
Discover Topics
Sphere
Stochastic Process or Random Process
Pie Chart or Circle Chart
General Quadrilateral
Cone