Question

Afla suma tuturor nr.care impartite la 9 dau catul egal cu restul!

Answer 1

Răspuns:

d:9=c rest r; catul = restul < 9 = (0,1,2,3,4,5,6,7,8)

d:9=0 rest 0 ⇒ d=0

d:9=1 rest 1⇒ d=1×9+1=10→ deimpartitul

d:9=2 rest 2 ⇒ d=2×9+2=20

d:9=3 rest 3 ⇒ d =3×9+3=30

d:9=4 rest 4 ⇒ d=4×9+4=40

d:9=5 rest 5 ⇒ d=5×9+5=50

d:9=6 rest 6 ⇒ d=6×9+6=60

d:9=7 rest 7 ⇒ d=7×9+7=70

d:9=8 rest 8 ⇒ d=8×9+8=80

10+20+30+40+50+60+70+80= 360 → suma numerelor