五个数A、B、C、D、E把平均数都扩大4倍，不计顺序，就是：A + B + C + D = -16A + B + C + E = 24A + B + D + E = -28A + C + D + E = 80B + C + D + E = 4上面式子相加得4（A + B + C + D + E）= (-4 + 6 - 7 + 20 + 1)*4 = 16*4即A + B + C + D + E = 16分别与上面式子相减得：A = A + B + C + D + E - (B + C + D + E) = 16 - 4 = 12以此类推B = -64C = 44D = -8
