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30 (30 − 0) + 1 = 31 .
.1 1
2
60 . 60 11
. 31 + 30 + 60 = 121 .
()
2000 1
.11 , 22 , 33 , … , 1991 11
.181 1 , 2 , 3 , … , 181
2000 = 181 :
11
.x x
11 2000 1 ()
3
. 33 3 11
33
2000 1
. 2000 = 60
33