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ptccs2new4
Author:
Cheung Wing Chuen
GeoGebra
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画直线等分三角形的面积
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
兩位數除以一位數(二)
球体的体积推导(优化版)
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Furstum
Sierpinski 分形
test007
凸透镜成像
指数函数定积分的动态演示.许兴华数学
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Mode
Scalene Triangles
Differential Calculus
Geometric Mean
Standard Deviation