Question

calculati suma nr. naturale ca impartite la 8 dau catul 5

Answer 1

x:8=5 rest r=>x=8*5+r, unde r<8

Deducem ca r∈{0,1,2,...7}. Numerele sunt:

x=8*5+0

x=8*5+1

x=8*5+2

x=8*5+3

x=8*5+4

x=8*5+5

x=8*5+6

x=8*5+7

Suma numerelor este 40*8+(0+1+2+...+7)=320+28=348.