Tham khảo Căn_bậc_hai_của_2

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WikiPedia: Căn_bậc_hai_của_2 http://www.math.ubc.ca/~cass/Euclid/ybc/ybc.html http://www.jdawiseman.com/papers/easymath/surds_si... http://www.numberphile.com/videos/root2.html http://mathworld.wolfram.com/PythagorassConstant.h... http://www.math.cornell.edu/~dwh/papers/sulba/sulb... http://adsabs.harvard.edu/abs/2011arXiv1110.5456U http://it.stlawu.edu/~dmelvill/mesomath/tablets/YB... http://jwilson.coe.uga.edu/emt669/student.folders/... http://catalogue.bnf.fr/ark:/12148/cb15504722x http://data.bnf.fr/ark:/12148/cb15504722x