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多邊形上的自由動點
Author:
Lee Shuwen
GeoGebra
New Resources
異分母分數減法
兩位數加法
画直线等分三角形的面积
第八周作业
三位數除以一位數（二）
Discover Resources
直線方程
整數÷整數_工作紙（一）_題4
Angry Bird
先估算，後看解釋
彈幕模擬
Discover Topics
Numbers
Similar Triangles
Surface
Triangles
Arithmetic Operations