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外公切線段長求法
Author:
謝易達
GeoGebra
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判斷球體
拼砌四邊形
兩組對邊相等的四邊形
三位數除以一位數（一）
【案例】2013年安徽高考15题
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橢圓參數式
最小周長
對數函數圖
空間坐標
雙重積分：Double Integral
Discover Topics
Rectangle
Frequency Distribution
Complex Numbers
Pythagoras or Pythagorean Theorem
Symmetry