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1977北京理1
Author:
常振虎
1977北京理1
GeoGebra
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兩組對邊相等的四邊形
算柱 (兩位數)
畫出對稱圖形
三位數除以一位數（二）
直角坐標平面上的旋轉變換
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兩個點波源產生的波紋
正多邊形滾動
rotational symmetry_3
數學1
太陽系的奧秘
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Linear Programming or Linear Optimization
General Quadrilateral
Quadratic Equations
Trigonometric Functions
Bar Chart or Bar Graph