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摩擦：在水平面上拖一个正方体
Author:
Peng Yu
GeoGebra
New Resources
异形操场
第三周作业效果演示
直線的斜率：水平變化 & 鉛垂變化
第八周作业1
比較五件物件的重量
Discover Resources
正12面體內接正四面體
sun1
Geometry: Angles Sum of Triangle (幾何：三角形內角和)
拋物線4--平行四邊形法
正方体展开图的副本
Discover Topics
Optimization Problems
Circle
Differential Calculus
Linear Functions
Square