问题标题:
初一的相反数那节课的,-(+7)+(-9)+(+8.07)-(-7/2)-[-(-5)]
问题描述:

初一的相反数那节课的,-(+7)+(-9)+(+8.07)-(-7/2)-[-(-5)]

童晓艳回答:
  -(+7)+(-9)+(+8.07)-(-7/2)-[-(-5)]   =-7-9+8.07+3.5-5   =-21+11.57   =-9.43
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