四个数分别为A、B、C、D不计对应顺序,形式就是：(A + B + C)/3 + D = 93(A + B + D)/3 + C = 135(A + C + D)/3 + B = 75(B + C + D)/3 + A = 111那么上面4式相加,则有：(3A + 3B + 3C + 3D)/3 + (A + B + C + D) = 4...