13.9-3.51+6.1+2.51简便计算

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13.9-3.51+6.1+2.51简便计算
13.9-3.51+6.1+2.51简便计算

13.9-3.51+6.1+2.51简便计算
13.9+6.1+2.51-3.51
=20+2.51-3.51
=22.51-3.51
=19

原式=(13.9+6.1)-(3.51-2.51)
=20-1
=19

13.9-3.51+6.1+2.51
  =(13.9+6.1)-(3.51-2.51)
  =20-1
  =19

=(13.9+6.1)+(2.51-3.51)=20-1=19