Question

S= 1+3+5+6+..................+69 pls dau coroana
​

Answer 1

1+3+5+6+...+69=

=69*(69+1)/2=

=69*70/2=

=69*35=

=2.415

Answer 2

Răspuns:

$1 + 3 + 5 + 6 + ... + 69 = 69 \times \frac{(69 + 1)}{2} = 69 \times \frac{70}{ 2} = 69 \times 35 = 2415$