（+0.5）+（-3.25)+(-2.75)+(+5.5)
问题描述：
（+0.5）+（-3.25)+(-2.75)+(+5.5)
答
(0.5+5.5)-(3.25+2.75)
=6-6
0
（+0.5）+（-3.25)+(-2.75)+(+5.5)
(0.5+5.5)-(3.25+2.75)
=6-6
0