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三角函数我需要的
Author:
李东
GeoGebra
New Resources
百分數及其應用
双心四边形
盈利與虧蝕
撒针估算面积实验
平行線的判定
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弦中點的軌跡
孔雀
proof24 羅文頡
講義/試卷 函數圖形 (雙函數)
箭头平移动画
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Parabola
Quadrilaterals
Constructions
Angles
General Quadrilateral