题有点多,
1.0-3.81-(+1.81)-(-5)
2.-7-(-8)-(-7又1/2)-(+9)+(-10)+11又1/2
3.-5-8
4.(-7)-(-10)+(-8)-(+2)
5.(-0.5)-(-3又1/4)+2.75-(+7又1/2)
6.(-32又1/3)-[5又1/4+(-3又1/7)-5.25-2又6/7]
7.-/-5/-(+4)-/-1/7/ + /-1/7/
8.1/2X4+1/4X6+1/6X8+.+1/2006X2008(要简便算法)