(-42)+57+(-84)+(-23)
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![(-42)+57+(-84)+(-23)](/uploads/image/z/203750-62-0.jpg?t=%EF%BC%88%EF%BC%8D42%EF%BC%89%EF%BC%8B57%EF%BC%8B%EF%BC%88%EF%BC%8D84%EF%BC%89%EF%BC%8B%EF%BC%88%EF%BC%8D23%EF%BC%89)
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(-42)+57+(-84)+(-23)
(-42)+57+(-84)+(-23)
(-42)+57+(-84)+(-23)
原式=-42-84-23+57
=-42-(84+23-57)
=-42-50
=-92
-92
-92
-92
解:
原式=57+(-149)
=-92
根据加法交换率可得
57+(-42)+(-84)+(-23)=57-42-84-23=-92
-92
-92
(-42)+57+(-84)+(-23)
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