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千年曆2
Author:
李春培
GeoGebra
New Resources
異分母分數減法
拼砌四邊形
直角坐標平面上的旋轉變換
四邊形的特性
兩位數除以一位數（一）
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類正五邊形摺法
Parallel lines (angle of inclination and slope) v2
angle sum of triangle
正圆锥展开图
空间几何体的表面积和体积
Discover Topics
Arithmetic Operations
Pyramid
Straight Lines
Triangles
Step Functions