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
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
13.9-3.51+6.1+2.51简便计算
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