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Calculati folosind factorul comun: 2009+2009*2010-2011*2008=

Răspuns :

2009+2009•2010-2011•2008= =2009 (1+2010)-2011•2008= =2009•2011-2011•2008= =(2008+1)•2011-2011•2008= =(2011•2008+2011)-2011•2008= =2011