Question

(1+2+......1994)÷1995

Answer 1

$F.Gauss: \frac{1994*1995}{2} :1995=997*1995:1995=997$

Answer 2

Avem o suma Gauss (1+2+...+n) care cere urmatoarea formula de rezolvare: [n(n+1)]:2 .Scriem exercitiul nostru asa cum este si aplicam Suma Gauss. [tex](1+2+...+1994):1995=\ \textgreater \ \frac{1994(1994+1)}{2} :1995\\ =\ \textgreater \ (997*1995):1995=\ \textgreater \ 1989015:1995=997.[/tex]