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生日问题1
Author:
徐晓东
GeoGebra
New Resources
科氏力 (Coriolis Force)
平行線的判定
双心四边形
盈利與虧蝕
第八周作业
Discover Resources
解方程式
任兩正方形重組成一大正方形partII
平移動畫（平移加滑桿）
四連桿(可調)
Properties of parallelogram(平行四邊形的性質)
Discover Topics
Perimeter
Statistical Characteristics
Quadratic Equations
Algebra
Hypothesis Testing