, . .
, . , I, V, X, L, , D, 1, 5, 10, 50, 100, 500, 1000. .
, , . , , . , .
, , . , ( 0 9), .
:
N = an an- 1 ... a 1 a 0, a -1 a -2 ... -m ( ),(3.1)
N ;
ai () ;
p ;
n, m .
, , .
( , , ). , (3.1), :
N = an·pn+an- 1 ·pn -1 +... +a 0 ·p 0 +a -1 ·p -1 +a -2 ·p -2 +...+-m·p-m. (3.2)
0 ( -1). , , 10().
(3.2), . 123,45:
122130,4-15-2 (10) = 1·102+2·101+3·100+4·10-1+5·10-2 = 100+20+3+0,4+0,05.
, : , , .
, : 0 1. , .