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毕氏螺线
Author:
夜雨嘀嗒
GeoGebra
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盈利與虧蝕
三角函数 的副本
平行線的判定
折扣
圓的基本性質
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正立方體中的正四面體
三元大作戰-勾選版
平面区域的理解
蜘蛛網
立体几何
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Piecewise Functions
Perimeter
LCM and GCD
Quadratic Functions
Distributions