A.200/1000+240/1000+168/1000 B.1-(200/1000+240/1000+168/1000) C.1-(200/1000)×(240/1000)×(168/1000) D.1-(200+240+168)/1000 E.以上都不對(duì)
A.34% B.11% C.10% D.6% E.18%
A.8 B.9 C.7.6 D.8.3 E.無法計(jì)算