а) 67+(33+(-89))=67+33-89=11
б) -45+10+(-15)+90=-45+10-15+90=140
в) 45+25+(-15)+(-75)=45+25-15-75=-20
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а) 67+(33+(-89))=67+33-89=11
б) -45+10+(-15)+90=-45+10-15+90=140
в) 45+25+(-15)+(-75)=45+25-15-75=-20