Question

EXERCITIUL 12.VA ROG DIN SUFLET!!!!!!!!!!!!!!!!!!""""""""!"""""""

Answer 1

Gauss 1+2+...+n=n(n+1):2
2+4+6+..+50=
=2(1+2+..25)
=2x25x26:2
=25x26
=650

Answer 2

2(1+2+3+......+25)=
2x 25x26 impărtit  2=
50x13=
=650