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动态平衡
Author:
张坤
GeoGebra
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三位數除以一位數（二）
判斷球體
異分母分數減法
第八周作业
兩組對邊相等的四邊形
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An angle problem
尺規作圖髒髒版
我的第一个绘本
線性估計(Linear Approximation)
長方體的體積
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Means
Histogram
Geometric Distribution
Equilateral Triangles
Cylinder