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乘法1
Author:
chen mingchuan
GeoGebra
New Resources
三位數除以一位數（二）
兩組對邊相等的四邊形
拼砌四邊形
兩位數加法
三位數除以一位數（一）
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p9pppppppppppppppp
題 3
工具：PlaneString
变化的三角形的旁心.许兴华数学
掷色子
Discover Topics
Scalene Triangles
Symmetry
Set Theory
Fractions
Hyperbola