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gjh-g05-01 平方差公式
Author:
均一
GeoGebra
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【案例】2018年全国1卷理科12题
異分母分數減法
錐體建築師
拼砌四邊形
三位數除以一位數（二）
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正四面體
正五角錐
旋轉方塊
star
椭圆的定义
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Numbers
Centroid or Barycenter
Translation
Median Line
Upper and Lower Sum or Riemann Sum