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可拖动A、B 改变形状
Author:
孟宝兴
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
異分母分數減法
四邊形的特性
兩位數除以一位數（一）
錐體建築師
Discover Resources
以剪貼比較圖形大小 題3
p11-11
perimeter
Clock Simulation
圓形方程 | Equations of Circles (Locus of a moving point from a fixed point)
Discover Topics
Straight Lines
Conic Sections
Surface
Natural Numbers
Statistical Characteristics