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Mariaboeriu89p2jemd
a fost răspuns

calculeaza 5 plus 10 plus 15 plus ........ plus 625

Răspuns :

5+10+15+....+625=5*(1+2+3+....+125)=5*((125*(125+1))/2)=5*125*126/2=39375
Mikelina

5+10+15+.....+625= 5(1+2+3+....+125)= 5×(125×126)/2= 5×125×63= 625×63= 39375

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