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sealion1215
GeoGebra
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随机三角形背景
GeoGebra游戏案例集
繪畫梯形
伞骨架模型
繪畫長方形
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waaachen
函數邏輯式
MHschool
時鐘
简谐振动函数图像的副本
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Symmetry
Statistical Characteristics
Statistics
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