简便计算:39－2.83+15.4+24.6－1.17？

Question

如题所述

Answer 1

39-2.83+15.4+24.6-1.17
=39-2.83-1.17+15.4+24.6
=39-(2.83+1.17)+(15.4+24.6)
=39-4+40
=35+40
=75
希望能够帮到你，还望采纳谢谢！

Answer 2

运用结合律
=39-（2.83+1.17）+（15.4+24.6）
=39-4+40
=75