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afla suma tuturor numerelor care impartite la 9 dau catul egal cu restul

Răspuns :

10:9=1 rest 1 
20:9=2 rest 2
30:9=3 rest 3
40:9=4 rest 4
50:9=5 rest 5
60:6=6 rest 6
70:7=7 rest 7
80:8=8 rest 8
suma numerelor:
10+20+30+40+50+60+70+80=60+40+50+60+70+80=100+50+60+70+80=210+70+80=280+80=360