(13.1+9.28)-(4.1-2.74)怎么巧算

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(13.1+9.28)-(4.1-2.74)怎么巧算

(13.1+9.28)-(4.1-2.47)
=(13.1-4.1)+9.28+2.47
=9+(9.28+2.47)
=9+11.75
=20.75
真简单

(13.1+9.28)-(4.1-2.47)
=(13.1-4.1)+9.28+2.47
=9+(9.28+2.47)
=9+11.75
=20.75

(13.1+9.28)-(4.1-2.47)
=(13.1-4.1)+9.28+2.47
=9+(9.28+2.47)
=9+11.75
=20.75