Question

determinati suma tuturor resturilor impartirii numerelor de doua cifre la 7

Answer 1

99:7 = 14 rest 1, deci 14 impartiri

10:7, rest 3

11:7, rest 4

12:7, rest 5

13:7, rest 6

14:7, rest 0

15:7, rest 1

........................

98:7, rest 0

99:7, rest 1

Vom avea 62 de resturi grupate astfel:

3+4+5+6+

0+1+2+3+4+5+6 de 8 ori

0+1, care insumate dau rezultatul

18 + 8x6(1+6):2 + 1 = 19 + 31 = 50.