(((1+19)*(1+(19/2))*(1+(19/3))*…*(1+(19/17)))/((1+17)*(1 +(17/2))*(1+(17/3))*...*(1+(17/19)))).
(((1+19)*(1+(19/2))*(1+(19/3))*…*(1+(19/17)))/((1+17)*(1+(17/2))*(1+(17/3))*…*(1+(17/19))))．
<result>1</result>