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41 (2)1 2 (1) (2) 1(4) 5×5(图2) 42 1 12 A=i+5 5 43 242524n2-1(图1) 3×39AB8 8(图2)1 3×33PQ 4(1)12.13PQ4(2)15.42 45 3×38 1644 162 814 1622 41 41 41 82 76 46 ABAC 47 CCACBCBCAC90ACBC 48 (1)A→C→E→B→D→A→B→C→D→E→A A→B→C→D→A→C→E→B→D→E→A (2)(traversability)43 18(Eu-ler)(Knigsbergbridges)(RiverPregel)717 ABCDBCD3A5(图2) ()4 33-P123P1P23P()ABAB 49 598 50
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