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六上:圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
New Resources
正方形雪花图案
撒针估算面积实验
第八周作业
斐波那契螺旋弧线(表格法)
平行線的判定
Discover Resources
Polygon Activity
test
箭头平移动画
mooc第五讲作业单晨制作
二項分佈的副本
Discover Topics
Arithmetic
Inequalities
Fractal Geometry
Rhombus
Area