摘要：(1) 四个数必然相邻，答案为 \((1,6) (1,2) (5,6)\) (2) \((a_1,a_4,a_7,a_{10}) , (a_3,a_6,a_9,a_{12}) , (a_5,a_8,a_{11},a_{14}) , (a_{4k-1},a_{4k},a_{4k+1},a_{4k+2} 阅读全文