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國旗
Author:
張瑋哲
GeoGebra
New Resources
龙形曲线-分形龙
平行線的判定
常见四边形是否是双心四边形
盈利與虧蝕
活动三：应用性质
Discover Resources
三角形面積
例子
彩色包絡球
軌跡方程式-弦中點
微元法演示
Discover Topics
Definite Integral
Sine
Derivative
Perimeter
Triangles