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任务6：三角形三边关系
Author:
陈丽婷
GeoGebra
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龙形曲线-分形龙2
平行線的判定
常见四边形是否是双心四边形
活动三：应用性质
撒针估算面积实验
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線型函數圖形測驗
正n星角
拋物線
正圆柱展开图-方式二
Copy of 折扣 例5
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Coordinates
Rectangle
Similar Triangles
Polynomial Functions
Calculus