设写到 n,擦掉的是 x (1+n)*n / 2 = (44+ 24/29)*(n-1) + xn-1 是29的倍数当n = 30时,左边 = 465,右边= 1300 + x,不合理当n = 59时,左边 = 1770,右边= 2600 + x,不合理当n = 88时,左边 = 3916,右边= 3900 + x,x = 16...