巧算7.2*61.3+73.8*2.8快

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巧算7.2*61.3+73.8*2.8快巧算7.2*61.3+73.8*2.8快巧算7.2*61.3+73.8*2.8快7.2*61.3+73.8*2.8=7.2*73.8+73.8*2.8-12.5

巧算7.2*61.3+73.8*2.8快
巧算7.2*61.3+73.8*2.8

巧算7.2*61.3+73.8*2.8快
7.2*61.3+73.8*2.8
=7.2*73.8+73.8*2.8-12.5*7.2
=738-12.5*4*1.8
=738-90
=648