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任务9：内凹的正方形
Author:
陈丽婷
GeoGebra
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折扣
盈利與虧蝕
平行線的判定
斐波那契螺旋弧线（表格法-可动态调节）
撒针估算面积实验
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四角錐的坡度
可积准则
三次函數圖形變化觀察
梯形堆垛
多边形外角和的副本
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Statistical Characteristics
Functions
Triangles
Optimization Problems
Line Segment