72*2.09-1.8*73.6怎样简便算?

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72*2.09-1.8*73.6怎样简便算?
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72*2.09-1.8*73.6怎样简便算?
72*2.09-1.8*73.6怎样简便算?

72*2.09-1.8*73.6怎样简便算?
72*2.09-1.8*73.6
=1.8*40*2.09-1.8*73.6
=1.8*(40*2.09-73.6)
=1.8*(83.6-73.6)
=1.8*10
=18

72*2.09-1.8*73.6
=1.8*40*2.09-1.8*73.6
=1.8*(83.6-73.6)
=1.8*10
=18

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