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fchengang函数变换
Author:
符成岗
GeoGebra
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活动三：应用性质
常见四边形是否是双心四边形
第八周作业
折扣
第八周作业1
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迭代出根號n螺旋線
銀杏葉
glt-h02-00-正方形折成三角錐
算法复杂度函数
推移（x 方向）的副本
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Complex Numbers
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