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三角形的心的副本
Author:
科学教师
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算柱 (兩位數)
畫出對稱圖形
直角坐標平面上的旋轉變換
近似值：有效數字
世界平面地圖 (Codex╱2026.10.07)
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用數值滑桿控製物件顯示條件
Contour Lines 等高線
直角
example1 star
平行線的性質的副本
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Means
Real Numbers
Quadratic Functions
Rotation
Rational Numbers