ajutor plz repedeewwwe

Răspuns:
a.
342+420-506+2×[15+3×(1600-1521)]=
256+2×(15+3×79)=
256+2×(15+237)=
256+2×252=
256+504=
760
b.
2013×(2012+2011-2022)+7×[9+2×(2809-2704)]=
2013×2001+7×(9+2×105)=
4028013+7×(9+210)=
4028013+7×219=
4028013+1533=
4029546
b > a