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LaRiSuKa1276
a fost răspuns

2013x2012+2013x2011-2013x2022+7x[9+2x(53²-52²)]

Răspuns :

Alexandravert
=2013(2012+2011-2002)+7*[9+2*(2809-2704)]=
=2013(4023-2002)+7*[9+2*105]=
=2013*2021+7*[9+210]=
=4068273+7*219=
=4068273+1553=
=4069806