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angles sum of a triangle 3
Author:
LAM YU SANG
GeoGebra
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判斷球體
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
sanjiaohanshu
直角坐標平面上的旋轉變換
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優良作品1(力誌)
ex 4
DSE Circle-ACT02B Angle at centre and circumference
賺賠：例3的副本
数学几何
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Ellipse
Cube
Scalene Triangles
Linear Equations
Geometric Distribution