16.17-11.28+3.38-1.72怎么简便

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16.17-11.28+3.38-1.72怎么简便
16.17-11.28+3.38-1.72怎么简便

16.17-11.28+3.38-1.72怎么简便
16.17+3.83-(11.28+1.72)=20-13=7

16.17-11.28+3.83-1.72
=16.17+3.83-(11.28+1.72)
=20-13
=7