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三角形的判別
Author:
camabula
GeoGebra
New Resources
活动三：应用性质
圓的基本性質
龙形曲线-分形龙
圓的切線方程
异形操场
Discover Resources
百分數（小學）：折扣 / 賺賠（HTML5 版）
題九
等弧對等角
test
科赫雪花
Discover Topics
Dilation
Similar Triangles
Arithmetic
Arithmetic Operations
Differential Calculus