用简便的方法计算1k(P9h0S4F/r,{
7.03-1.8+6.871k(P9h0S4F/r,{
算式：提示8W(}'l)C.Y1k(P9h0S4F/r,{
=3H.{5X+Q/f6`)F-O1k(P9h0S4F/r,{