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方格纸上画平行线和垂线
Author:
郭勇
GeoGebra
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判斷球體
兩組對邊相等和有直角的四邊形
找出對稱軸
兩位數除以一位數（二）
三位數除以一位數（一）
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vbvbvbvc
畢氏定理拼圖
雙曲線2 交點法
內外角平分線的副本
洋葱初中数学
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Numbers
Derivative
Probability
Function Graph
Solids or 3D Shapes