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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
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判斷球體
球体的体积推导
兩位數除以一位數（二）
【案例】2013年安徽高考15题
錐體建築師
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優良作品2(祥恩)
GGB作業
Addition and Subtraction of Polynomials 2 (多項式的加減法2)
名師補習中介 Top Tutor
双勾函数的图象.许兴华数学
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Hypothesis Testing
Circumcircle or Circumscribed Circle
LCM and GCD
Isosceles Triangles
Triangles