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Sat Apr 01 23:22:46 HKT 2017

math



About PI - http://thestandnews.com[..]i-%E6%98%AF%E6%B0%B8%E6%81%86-%E4%BA%8C/

Interesting maths - http://list25.com[..]math-principles-to-challenge-your-brain/


(google search) (amazon search)
second
download zip of files only