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a) 21+42+63+84+...2100?
b) 4+8+12+16+...480?
c)25+50+75+100+...400?
d)10+20+30+40+...+490?
e)6+12+18+...1200?
f)30+60+90+120+...+900?
g)15+30+45+60+...600?

trebuie sa faceti aici cu suma Gaos(Dau coroana)


Răspuns :

A-35000 b-7848 c-1000 d-8000 e -4300 f-4000 g-2200