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（六）组合图形的面积
Author:
玖玖
GeoGebra
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盈利與虧蝕
龙形曲线-分形龙
科赫雪花
龙形曲线-分形龙2
折扣
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nozzle position_Alex0417_R1
雙曲線
一次函數平移(進階)
ie 9
盾牌(小動畫)
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Geometric Transformations
Right Triangles
Distributions
Piecewise Functions
Hyperbola