25.27-4.9+3.73-15.1 要简便

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25.27-4.9+3.73-15.1 要简便

25.27-4.9+3.73-15.1
=(25.27+3.73)-(4.9+15.1)
=29-20
=9

25.27-4.9+3.73-15.1
=(25.27+3.73)-(4.9+15.1)
=29-20
=9

25.27-4.9+3.73-15.1
=(25.27+3.73)-(15.1+4.9)
=29-20
=9