题目：3.75 + 8.2 - 4.93 + 7.875 - 3.45 + 15.6 + 123.45 - 67.89 + 54.32 - 0.78 + 20.125 - 9.008 + 100.1 - 99.99 + 5.55 - 9.008 + 6.66 - 18.72 + 9.8 - 0.305 + 123.45 - 67.89 + 45 - 12.345 + 7.89 - 89.6 + 0.001 - 23.45 + 11.11 - 67.8 + 0.78 + 90.12 - 80 + 36.78 - 1.234 + 50 + 1.01 - 0.99 + 7.654 - 2.3 - 1.01 + 34.56 - 78.9 + 100.1 - 99.99 + 7.654 - 5.55 + 6.66 - 18.72 + 9.8 - 34.56 + 0.305 - 12.7 + 45 -...