Question

2+3+4+...+50
1+2+3+...+500
1+9+7+2+999+3+198
1+2+3+....+124
2+4+67+.....+600
5+6+7+....81
1+2+3+....+512
Va rog frumos urgent

Answer 1

iti fac un exercitiu sa il ai ca model
1+2+3+...+124= (125+124 :2)•2=(125+62)•2=187•2=374