题目-19.8-(-20.3)-(+20.2)-10.8怎样做?
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题目-19.8-(-20.3)-(+20.2)-10.8怎样做?题目-19.8-(-20.3)-(+20.2)-10.8怎样做?题目-19.8-(-20.3)-(+20.2)-10.8怎样做?-19.
题目-19.8-(-20.3)-(+20.2)-10.8怎样做?
题目-19.8-(-20.3)-(+20.2)-10.8怎样做?
题目-19.8-(-20.3)-(+20.2)-10.8怎样做?
-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