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加法(粒條)
Author:
nakita
Topic:
Addition
GeoGebra
New Resources
拼砌四邊形
画直线等分三角形的面积
第八周作业
球體建築師
兩位數除以一位數（二）
Discover Resources
中點軌跡(動點在兩圓上)
極座標
餘角
滑桿應用
面积解题
Discover Topics
Planes
Natural Numbers
Matrices
Quadratic Functions
Surface