Răspunsuri

2014-11-05T20:21:38+02:00
2010*2010 - 2010 - 2009 = 2010 *( 2010-1) - 2009 =2010 * 2009 - 2009 = 2009 * ( 2010 - 1 ) = 2009 * 2009 = 2009 ²