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1+2+3+....+50 CALCULATI SUMELE


Răspuns :

1 +2 +3 + ....+50 =
n = ( 50 -1 ) : ( 2 -1 ) +1
n = 49 : 1 +1
n = 49 + 1
n = 50
S = [( 50 +1) x 50 ] : 2
S = ( 51 x 50 ) : 2
S = 2550 : 2
S = 1275.
50(50+1) supra 2
50×51 supra 2
2250 :2