Question

S=1+2+3+......715 Va rog ajutati-ma
Sunt sume gaus Dau coroana

Answer 1

S=715•716:2
S=715•358
S=255970

Answer 2

S=1+2+3+......715S Gauss are formula:$\frac{n(n+1)}{2}$
unde n=ultimul numar al sirului

$S= \frac{n(n+1)}{2}=\frac{715(715+1)}{2}= \frac{715*716}{2} =255970$