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mooc第四讲椭圆反射
Author:
单晨
GeoGebra
New Resources
三位數除以一位數（二）
柱體建築師
兩組對邊相等的四邊形
画直线等分三角形的面积
球体的体积推导（优化版）
Discover Resources
waaachen
binary number system
觀察軌跡
物件的平移概念
qr code for symmetry
Discover Topics
Vectors
Hypothesis Testing
Frequency Distribution
Standard Deviation
Quadratic Equations