(17又27分之2+27又27分之2-11又39分之37)/(13又27分之12+8又27分之17-5又39分之38)
=(33+4/27-37/39)/(17+2/27-38/39)
=(32+4/27+2/39)/(16+2/27+1/39)
=2
(17又27分之2+27又27分之2-11又39分之37)/(13又27分之12+8又27分之17-5又39分之38)
=(33+4/27-37/39)/(17+2/27-38/39)
=(32+4/27+2/39)/(16+2/27+1/39)
=2