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Calculati dand factor comun
a)2001x1999-2000

b)47x52+47²+47



Răspuns :

47x52+47²+47=47x(52+47+1)=47x100=4700
2001x1999-2000=2000x1999+1999-2000=1999x(2000+1-2000)=1999x1=1999