1. (71.2-71.2*0.9)/0.25 =(71.2-64.08)/ 0.25 =7.12/0.25 =28.482. 13.5/[(2-0.8 )*4.5] =13.5/[1.2*4.5] =13.5/5.4 =2.53. [(6.1-4.6)/0.8]*0.4 =[1.5/0.8]*0.4 =1.875*0.4 =0.75
给分就告诉你