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撒针估算面积实验
Author:
孟宝兴
GeoGebra
New Resources
異分母分數減法
三位數除以一位數（二）
算柱 (兩位數)
兩位數除以一位數（一）
拼砌四邊形
Discover Resources
給柱體一個名字 3
二元一次不等式
摺紙模板
勝者即正義
Locus: P equidistant from two fixed points
Discover Topics
Normal Distribution
Tree Diagrams
Correlation
Line Segment
Arithmetic