Răspuns :
2 + 4 + 6 + ... + 50
2 ( 1 + 2 + 3 +... + 25 )
2 ( 25 × 26 ÷ 2)
2 × 325
650
2 ( 1 + 2 + 3 +... + 25 )
2 ( 25 × 26 ÷ 2)
2 × 325
650
2+4+6...+50=
factor comun 2
avem
1+2+3......+25=25x26/2=650:2=325 (suma lui Gauss)
factor comun 2
avem
1+2+3......+25=25x26/2=650:2=325 (suma lui Gauss)