2.64+8.24+10.76-1.57简便计算

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2.64+8.24+10.76-1.57简便计算
2.64+8.24+10.76-1.57简便计算

2.64+8.24+10.76-1.57简便计算
2.64+(8.24+10.76)-1.57
=2.64+19-1.57
=21.64-1.57
=20.07

2.64+8.24+10.76-1.57
=2.64+(8.24+10.76)-1.57
=2.64+19-1.57
=21.64-1.57
=20.07