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4.3平行线的性质
Author:
欧几里得
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
兩位數加法
兩位數除以一位數（一）
異分母分數減法
畫出對稱圖形
Discover Resources
龍騰4_1-1講進4
模版 - 有框黑板 (1)
碎形花瓣6
立體圖形的截面
ggb 優良作品_10
Discover Topics
Scalene Triangles
Cube
Circumcircle or Circumscribed Circle
Combinatorics
Perimeter