一二天一共 = 1-1/4 = 3/4第一天 = 3/4 * (2/(2+ 3)) = 3/10所以路长=58 /(3/10 - 1/6) = 435整个式子为：58 / ((1- 1/4)*(2/(2+3)) - 1/6) = 435
