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Alexandra124
a fost răspuns

Ajutor Urgent!!!!!!!!! DAU CORONITA!!

a)5+10+ 15 .....+400
b) 7+9+11+....+2013-5-7-9-2011

Răspuns :

Alex05ok
a) 5(1+2+3+...+80)=5*81*40=16200
sau
5+400+10+395+...=405*40=16200

b) 7+9+11+....+2013-5-7-9-2011=7+2013+9+2011+...-2032=2020*1004:2-2032=
=1014040-2032=1012008




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