Răspuns :
1 +2 +3 + ....+ 504 =
n = ( 504 - 1 ) : ( 2 - 1 ) +1
n = 503 : 1 +1
n = 503 +1
n = 504
S = [( 504 + 1) x 504]: 2
S = ( 505 x 504 ) : 2
S = 254520 : 2
S= 127260.
n = ( 504 - 1 ) : ( 2 - 1 ) +1
n = 503 : 1 +1
n = 503 +1
n = 504
S = [( 504 + 1) x 504]: 2
S = ( 505 x 504 ) : 2
S = 254520 : 2
S= 127260.
Luam dupa formula : n(n+1) supra 2
504(504+1) supra 2= 504 *505 supra 2=254.520/2 =127.260
S=127.260
504(504+1) supra 2= 504 *505 supra 2=254.520/2 =127.260
S=127.260