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烟囱
Author:
赵林
GeoGebra
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四邉形 (四年級) 教師版
兩組對邊相等的四邊形
異分母分數減法
GeoGebra笔记功能体验课件
算柱 (兩位數)
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Area of trapezoid
觀察圖中有哪些角會相等
全等三角形
線性組合3：正方形
congruent (SSA,RHS)
Discover Topics
General Quadrilateral
Unit Circle
Conic Sections
Root
Correlation