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3,5 54-56 , 5-6 . 2 fibra natura.
6 , . 1 - 2 - ... 12 - 11 ( 12), 5 18 - 12 ( 13), 84 . . , . , , , . : 1 - , , 12 . 84:12=7, .. 7 . 84+12=96 . 6 , 96:6=16, . . 16 . 8 , 9 , 15, 16 . : , , , . . , 1, . . , . . : ( - 15%):3,14=