277期：五不中{17,45,35,20,40}开46 11 41 33 48 37 = 16 准
278期：五不中{27,10,13,38,37}开04 18 33 34 45 39 = 28 准
279期：五不中{21,36,26,17,44}开37 01 26 42 39 30 = 27 错
280期：五不中{13,37,24,17,32}开准