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重心
Author:
湯士賢
GeoGebra
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異分母分數減法
三位數除以一位數（二）
拼砌四邊形
球體建築師
直角坐標平面上的旋轉變換
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Angle Sum in a Triangle
兩弦的長度比較
到两点距离之积为定值的点的轨迹
雙曲線1--焦點法
S3 Ch4.3 例4.6a 三視圖(3D圖)
Discover Topics
Hyperbola
Algebra
Vectors 2D (Two-Dimensional)
Curve Sketching
Isosceles Triangles