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數粒
Author:
marcolee201314
GeoGebra
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异形操场
盈利與虧蝕
双心四边形
比較五件物件的重量
直線的斜率：水平變化 & 鉛垂變化
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乘法公式2
三角形的分割與組合(2)
愛心曲線
Mars Retrograde
拋物線的光線反射 獻給聰哥
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Special Points
Rotation
Area
Trapezoid
Right Triangles