竞赛篇答案: 81.150 82. 20:39 83. 57 84. 7 85. 7 86. 3 ,15 87. 80.2 兆 88. 50% 89. 6 90. 2 91. 102 92. 99 93. 753 94. 17 95. 34 96. 10 97. 12.25 98. 60 99. 3 100. 2.70