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illusion 鏡射
Author:
arist
GeoGebra
New Resources
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
四邊形的特性
拼砌四邊形
Discover Resources
梯形
三餘弦定理問題
反射路徑(角落進洞)
Sierpinski Triangle
初中数学模型
Discover Topics
Combinatorics
Multiplication
Numbers
Triangles
Algebra