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乘法1
Author:
chen mingchuan
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等的四邊形
畫出對稱圖形
三位數除以一位數（二）
直角坐標平面上的旋轉變換
Discover Resources
Ex5C#2
My First Geogebra Book
恆等式
三角形的內心
撒针估算面积实验
Discover Topics
Polygons
Terms
Translation
Hypothesis Testing
Trigonometric Functions