(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)-(4.1-2.74)怎么巧算

(13.1+9.28)-(4.1-2.74)怎么巧算
(13.1+9.28)-(4.1-2.74)
=13.1-4.1+9.28+2.74
=9+9.28+2.74
=18.28+2.74
=21.02

(13.1+9.28)-(4.1-2.74)
=13.1-4.1+9.28+2.74
=9+12.02
=21.02

(13.1-4.1)+(9.28+2.74)

(13.1+9.28)-(4.1-2.74)
=(13.1-4.1)+(9.28+2.74)
=9+12.02
=21.02