58.26-13.6-6.4+1.74 怎么简便计算

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58.26-13.6-6.4+1.74 怎么简便计算
58.26-13.6-6.4+1.74 怎么简便计算

58.26-13.6-6.4+1.74 怎么简便计算
58.26-13.6-6.4+1.74
= (58.26+1.74)-(13.6+6.4)
= 60-20
= 40

=58.26+1.74-(13.6+6.4)
=60-20
=40