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marcolee201314
GeoGebra
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龙形曲线-分形龙
龙形曲线-分形龙2
盈利與虧蝕
中华人民共和国国旗
活动三:应用性质
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優良作品4(薇如)
堆垛
半椭圆面积的定积分动态演示.许兴华数学
狗绕五边形转
平面直角坐标系的构成
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Complex Numbers
Means
Piecewise Functions
Cylinder
Multiplication