👤

4+8+12+..............+1996=?

Răspuns :

Suma lui Gauss : n(n+1):2

4+8+12+............+1996=
4(1+2+3+............+499 )=
499(499+1):2=124750

4(1+2+3+.............1996)=124750*4=499000
4+8+12+...+1996=4 x(1+2+3+...499)=4(499x500 :2)=4 x(249500:2)=4 x 125750=499000