13.26-2.8+2.8-3.39怎么简便计算

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13.26-2.8+2.8-3.39怎么简便计算
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13.26-2.8+2.8-3.39怎么简便计算
13.26-2.8+2.8-3.39怎么简便计算

13.26-2.8+2.8-3.39怎么简便计算
13.26-2.8+2.8-3.39=13.26+(2.8-2.8)-3.39=13.26-3.39=9.87

13.26-2.8+2.8-3.39=13.26+(2.8-2.8)-3.39=13.26-3.26-0.13=(13.26-3.26)-0.13=10-0.13=9.87

13.26-2.8+2.8-3.39
=13.26-2.8+2.8-3.26-0.13
=(13.26-3.26-0.13)-(2.8-2.8)
=9.87-0
=9.87

5.24-1.86+0.24 =5+0.24-(1+0.86)+0.24 =5+0.24-1-0.86+0.24 =0.24+0.24-0.86+5-1 =-0.38+5-1 =4-0.38 =3.62 这样