4.8/[4.2-1.8]*0.717.8/[1.78*4]

更新时间2018-11-04 14:21:32

 4.8/(4.2-1.8)×0.7

=4.8/2.4×0.7

=2×0.7

=1.4

  17.8/(1.78×4)

=17.8÷1.78÷4

=10÷4

=2.5

4.8/(4.2-1.8)*0.7=4.8/2.4*0.7=2*0.7=1.4

17.8/(1.78*4)=10/4=2.5

原式=4.8÷2.4×0.7

      =2×0.7

      =1.4

 

原式=17.8÷1.78÷4

      =10÷4

      =2.5