题目-19.8-(-20.3)-(+20.2)-10.8怎样做?
问题描述:
题目-19.8-(-20.3)-(+20.2)-10.8怎样做?
答
-19.8-(-20.3)-(+20.2)-10.8
=-19.8+20.3-20.2-10.8
=(20.3-19.8)-(20.2+10.8)
=0.5-31
=-30.5