Question

Cum rezolvi ex:

1+2+3+....+100

Answer 1

Folosim formula n(n+1):2
N-ul nostru este 100.
1+2+3+..+100=100(100+1):2=101*100 :2=10100:2=5050

Answer 2

$\text {Suma~lui~Gauss~:}$

1+2+3+...+100=
100×101:2=
50×101=5050

--- Formula este : n×(n+1):2