Question

b=1+3+5+...+77+79 formula lui gaoss

Answer 1

1=2*0+1
3=2*1+1
5=2*2+1
...
79=2*39+1
(2*0+1)+...+(2*39+1)= 2*(0+1+2+...+39) +1*40=2*(39*40:2)+40=39*40+40*1=40*(39+1)=40*40=1600
Sper ca te am ajutat si apropo este Formula lui Gauss!