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長方體旋轉
Author:
chen mingchuan
GeoGebra
New Resources
算柱 (兩位數)
画直线等分三角形的面积
第八周作业
GeoGebra笔记功能体验课件
三位數除以一位數（一）
Discover Resources
百分數（小學）：折扣 / 賺賠
Surface area of sphere
同底等高
Crayon shin-chan, Episode 1232, Cut
直角三角形的內心與相似