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Author:
chen mingchuan
GeoGebra
New Resources
畫出對稱圖形
兩位數除以一位數（一）
四邊形的特性
【案例】2013年安徽高考15题
判斷球體
Discover Resources
三角函數圖形（全）
Fill the circle
雙變數函數極限
All you need is
滾動圓周來發現圓周長 的複本
Discover Topics
Real Numbers
Logarithmic Functions
Arithmetic Operations
Exponent
General Quadrilateral