Question

va rog ajutatima si pe mine la un exercitiu de suma gaus 1+2+3+......+50

Answer 1

1+2+3+...+50=50×51/2=1275
se aplica formul 1+2+3+...+n=n(n+1)/2

Answer 2

S=1+2+3+...+50
S=50+49+48+...1

2S=51+51+51+...+51
2S=51×50
2S=2550
S=2550:2
S=1275

50(50+1):2=50×51:2=2550:2=1275