Question

Aflati suma :1+3+5+...+213 , urgeeent plss ,[nu ii pt mn ] , dau coroana +20 pcte

Answer 1

222 este raspunsul cred dar astai tot unde scrie cit ese raspunsul final

Answer 2

1+3+5+...+213 =107x(1+213):2=107x214:2=107x107=11 449 (suma lui Gauss)
213+211+..+1=
______________
(1+213)+(3+211)+(5+209)+.....+(213+1)=11 449
=(214x107):2=
=22 898:2=
=11 449
(213-1):2+1=212:2+1=106+1=107 termeni