1÷[28-(8分之3-4分之1）÷（6分之5-3分之1）]
问题描述：
1÷[28-(8分之3-4分之1）÷（6分之5-3分之1）]
答
1/(28-(3/8-1/4)/(5/6-1/3))
=1/(28-(1/8)/(1/2))
=1/(28-1/4)
=4/111;