@ @QPU@ @ÖïÐaínÜaì@Þî†bjnÜa@ @ A C 5B 5 A 5 B C . : .1 .B A C .1×1 . .C .(1)3 = 1 .C : .(1)3 = 1 B4 : AC 4 .B A 4 .C(5,1) ×C(5,1)×C(5,1) = 53 . B C 4: . 53 . CB : .C(5,2)×C(5,2) ×C(5,2) = 103 . BC : .103