Question

2.4*(5-0.375+2.4*0.375)怎么简算

Answer 1

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