1+[8又1/4-(8.5-4*1又7/8)÷0.125]
=1+[8又1/4-(8.5-4*15/8)÷0.125]
=1+[8又1/4-(8.5-15/2)÷0.125]
=1+[8又1/4-1÷0.125]
=1+[8又1/4-8]
=1+1/4
=1又1/4.