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Alessiaradu395
a fost răspuns

a)2+4+6+....+50;
b)1+2+3+....+29+30+35+500.
(Si formula)

Răspuns :

a) 2(1+2+3+...+25)=2*25*26:2=650
b)1+2+3+....+29+30+35+500=30*31:2+35+500=465+35+500=1000