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ghseh 二次函數的開口方向
Author:
均一
GeoGebra
New Resources
兩位數加法
兩組對邊相等和有直角的四邊形
異分母分數減法
判斷球體
兩位數除以一位數（二）
Discover Resources
用面積逼近圓周率
兩圓內公切線
MY first GGBBook
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長度和距離(毫米)
Discover Topics
Integers
Intersection
Special Points
Bar Chart or Bar Graph
Vectors 2D (Two-Dimensional)