Question

Cate nr. nat. impartite la 7 dau catul 5?
Calc. suma acestora.

Answer 1

d:7=5 si r
r<7
D=C×Î+R
d=7×5+r

Ii dam valori lui r ( restul ) , astfel aflând deimpartitul.

r=0 => d=7×5+0 => d=35
r=1 => d=7×5+1 => d=36
r=2 => d=7×5+2 => d=37
r=3 => d=7×5+3 => d=38
r=4 => d=7×5+4 => d=39
r=5 => d=7×5+5 => d=40
r=6 => d=7×5+6 => d=41

Calculăm suma lor :
35+36+37+38+39+40+41=
=71+75+79+41=
=146+120=
=266