2.4(5-0.375+2.40.375)怎么简算

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2.4*(5-0.375+2.4*0.375)怎么简算
2.4*(5-0.375+2.4*0.375)怎么简算

2.4*(5-0.375+2.4*0.375)怎么简算
2.4*(5-0.375+2.4*0.375)
=2.4*(5-3/8+2.4*3/8)
=2.4*[5+3/8(2.4-1)]
=12/5*[5+3/8*1.4)]
=12/5*[5+3/8*7/5]
=12/5*[5+21/40]
=12/5*5+12/5*21/40
=12+63/40
=12+1.575
=13.575