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圆在圆上/内滚动
Author:
Sylvie
GeoGebra
New Resources
异形操场
第八周作业1
撒针估算面积实验
活动三：应用性质
斐波那契螺旋弧线（表格法-可动态调节）
Discover Resources
色彩視覺藝術：內心與旁心
題二
games
人生宇宙
函数作图工具的副本
Discover Topics
Triangles
Rectangle
Orthocenter
Logarithmic Functions
Tangent Function