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happy new year
Author:
李春培
happy new year
GeoGebra
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第三周作业效果演示
比較五件物件的重量
正方形雪花图案
科赫雪花
折扣
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折扣 例6
餘弦的定理
左右
Ex5D#1
半圆面积的微积分动态演示.许兴华数学
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Logarithm
Line Segment
Hyperbola
Functions
Reflection