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3+6+9+....+300=
vă rog, suma lui Gaoss


Răspuns :

3 + 6 + 9 + ...+300 =
n = ( 300 - 3 ) : ( 6 - 3 ) +1 
n = 297 : 3 + 1
n = 99 +1
n = 100
S = [( 300 +3) x 100] : 2
S = (303 x100):2
S = 30300 : 2
S = 15150.

3+6+9....+300=n=(300-3):(6-3)+1             n=297:3+1   n=99+1 n=100  S[(300+30x100]:2   S=(303+100):2    S=30300:2   S=15150