-5又5/6-9又2/3+17又3/4-3又1/2
=17又3/4-(5又5/6+9又2/3+3又1/2)
=71/4-(35/6+29/3+7/2)
=213/12-(70/12+116/12+42/12)
=213/12-228/12
=-15/12
=-5/4
-5又5/6-9又2/3+17又3/4-3又1/2
=17又3/4-(5又5/6+9又2/3+3又1/2)
=71/4-(35/6+29/3+7/2)
=213/12-(70/12+116/12+42/12)
=213/12-228/12
=-15/12
=-5/4