👤

[1-2+3-4+...-200+201]x 5

Răspuns :

[1-2+3-4+...-200+201]x 5=-5
pana la 200 grupam termenii care 2 =>( -1-1-1.....-1+201)*5 sunt 100 termeni (-1) => nr=(-100+201)*5=101*5=505