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定长线段在相交直线上滑动
Author:
冯伟冀
GeoGebra
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科赫雪花
第三周作业效果演示
第八周作业3
第八周作业2
盈利與虧蝕
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waaachen
百分數:折扣、盈利與虧損
測試1
四下_面積(一)(教師版)
旋轉的概念
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Numbers
Percentages
Expected Value
Exponent
Translation