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20200108中线倍长大法
Author:
陈敦莹
GeoGebra
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球体的体积推导（优化版）
第八周作业
判斷球體
三位數除以一位數（一）
錐體建築師
Discover Resources
全等三角形: 重溫
proof RHS
對稱及變換
X and Y.
指数函数的副本
Discover Topics
Geometry
Quadrilaterals
Mode
Polygons
Symmetry