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proof50 劉邦佑
Author:
郭亮偉
GeoGebra
New Resources
異分母分數減法
算柱 (兩位數)
找出對稱軸
四邊形的特性
三位數除以一位數（一）
Discover Resources
正八面體
謝爾賓斯基三角形
Contour Lines 等高線
sun2
函数y=x+(a/x)的图象如何变化？许兴华数学
Discover Topics
Similar Triangles
Isosceles Triangles
Translation
Addition
Natural Numbers