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Folosind proprietatil;e operatiilor invatate calculati
 
   2007+2008×2007-2009×2006=


Răspuns :

 2007+2008×2007-2009×2006=2007x(1+2008)-2009x2006=2007x2009-2009x2006=2009x(2007-2006)=2009
2007+4030056-4030054=2007+2=2009