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S4E14 圣诞树
Author:
宋晓燕
GeoGebra
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球体的体积推导（优化版）
兩位數除以一位數（一）
拼砌四邊形
畫出對稱圖形
四邊形的特性
Discover Resources
gjh-a02-hippocrates 月牙
正六角柱
Question 3
圓心角圓周角弦切角
答重庆杨志友椭圆的定义
四邉形 (四年級) 教師版
Discover Topics
Vectors 2D (Two-Dimensional)
General Quadrilateral
Variance
Solids or 3D Shapes
Subtraction