Răspuns :
x + (1 + 2 + .. + 49) = 1625
x + 49×50:2 = 1625
x = 1625 - 49×25
x = 1625 - 1225
x = 400
Răspuns:
x+(1+2+3+...+49)=1625
suma lui Gauss
(1+2+3+...+49)=(49·50):2=1225
x+1225=1625
x=1625-1225
x=400
x + (1 + 2 + .. + 49) = 1625
x + 49×50:2 = 1625
x = 1625 - 49×25
x = 1625 - 1225
x = 400
Răspuns:
x+(1+2+3+...+49)=1625
suma lui Gauss
(1+2+3+...+49)=(49·50):2=1225
x+1225=1625
x=1625-1225
x=400