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周界2
Author:
felixchow
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近似值：有效數字
算柱 (兩位數)
判斷球體
AI 訓練教室
畫出對稱圖形
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三下_三角形( 教師版)
Drawing quadrilaterals on the grid or the pinboard
相同圖形的拼砌（梯形）
圓環
matrix of rotation transformation
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Cube
Curve Sketching
Circle
Similar Triangles
Parallelogram