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跑馬燈
Author:
chen mingchuan
GeoGebra
New Resources
拼砌四邊形
三位數除以一位數（一）
画直线等分三角形的面积
三位數除以一位數（二）
兩組對邊相等的四邊形
Discover Resources
testing
圓周 (圖形F)
Copy of 分數與小數
Gazing Cow Problem (a)
Uses of Trigonometry
Discover Topics
Probability
Scalene Triangles
Coordinates
Means
Line Segment