【3.2*(1.2-0.16*1/4)+5 4/5】*0.1/(0.58/5)
=【3.2*(1.2-0.04)+5 4/5】*0.1/(0.58/5)
=【3.2*1.16+5.8】*0.1/(0.58/5)
=【3.2*2*0.58+10*0.58】*0.1/(0.58/5)
=[6.4*0.58+10*0.58]*0.1*(5/0.58)
=16.4*0.58*0.1*5/0.58
=16.4*0.1*5
=8.2