Question

calculati 7+14+21+28+35+42 ,folositi metoda lui Gauss

Answer 1

7+14+21+28+35+42 =

= 7×1 + 7×2 + 7×3 + 7×4 + 7×5 + 7×6 =
( dam factor comun pe 7)
= 7×(1 + 2 + 3 + 4 + 5 + 6) =
(rezolvam paranteza folosind Suma lui Gauss)
= 7 × 6 × (6 + 1) : 2 =

= 7 × 3 × 7 =

= 21 × 7 =

= 147

Rezolvarea conform cerintei