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猜猜平均數（限時版）
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
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Discover Resources
正餘弦函數的疊合之二102.11.29
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圖5(動能分析)
Discover Topics
Arithmetic Operations
Sequences and Series
Division
Rational Numbers
Arithmetic Mean