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孟宝兴

三角函数的副本

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常见四边形是否是双心四边形

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3
双心四边形

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撒针估算面积实验

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8
Earth and Sun

Rafael Losada Liste
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正方形雪花图案

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龙形曲线-分形龙2

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龙形曲线-分形龙

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3
第三周作业效果演示

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活动三：应用性质

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科赫雪花

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中华人民共和国国旗

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