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象限
Author:
李春培
GeoGebra
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兩組對邊相等的四邊形
兩位數除以一位數（一）
GeoGebra笔记功能体验课件
找出對稱軸
四邉形 (四年級) 教師版
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溫室
拋物線
時鐘與數學
Ex5D#5
畫三角形 題1a 的複本
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Subtraction
Isosceles Triangles
Quadrilaterals
Random Variables
Volume