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?](/uploads/image/z/6828191-71-1.jpg?t=%E9%A2%98%E7%9B%AE-19.8-%EF%BC%88-20.3%EF%BC%89-%EF%BC%88%2B20.2%EF%BC%89-10.8%E6%80%8E%E6%A0%B7%E5%81%9A%3F)
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