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凹凸透镜对平行光线的作用
Author:
李大地(Field Lee)
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
兩位數加法
三位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
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圓周角的度數
Salaries Tax in Hong Kong 薪俸稅
sinα + sinβ > 0 ?
題四
爱心
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Statistics
Congruence
Variance
Similar Triangles
Translation