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正方形折纸减去两角
Author:
孟宝兴
GeoGebra
New Resources
畫出對稱圖形
兩組對邊相等和有直角的四邊形
判斷球體
兩位數除以一位數（一）
四邊形的特性
Discover Resources
正三角形
扇形面積公式1
三視圖04
函数作图工具的副本
試算表畫纏繞畫
Discover Topics
Ellipse
Real Numbers
Special Points
Surface
Quadratic Functions