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同心圓
Author:
倪若雲
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
【案例】2013年安徽高考15题
畫出對稱圖形
兩組對邊相等的四邊形
Discover Resources
f(x) and f(-x)
動態文字指數函數
題九
spinral
七巧板
Discover Topics
Constructions
Logarithmic Functions
Arithmetic
Frequency Distribution
Upper and Lower Sum or Riemann Sum