👤

a) 2+3+4+.......+50 =? ( sumă gauss)

Răspuns :

2+3+4+.......+50 =

1+2+3+...+50-1=

50x51\2-1=

25x51-1=

1275=1=

=1274

Succes!

2+3+4+...+50=

[(2+50)×49]:2=

(52×49):2=

2548:2=

1274