Cho http://dientuvietnam.net/cgi-bin/mimetex.cgi?\,x^2+y^2)và http://dientuvietnam.net/cgi-bin/mimetex.cgi?\dfrac{x^2+y^2}{x+y}\in Ư(1978).CMR x=y
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Started By cntt, 17-07-2006 - 10:57
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