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內擺線的包絡線
Author:
陳隆期
GeoGebra
New Resources
盈利與虧蝕
斐波那契螺旋弧线（表格法-可动态调节）
平行線的判定
折扣
龙形曲线-分形龙2
Discover Resources
蝴蝶定理推廣證明1
斜率
ptccs2new3
test for fun的副本
数学之美
Discover Topics
Rectangle
Polynomial Functions
Arithmetic Operations
Hyperbola
Subtraction