[8又3/4-(10.5+1/8)*8/13]除以(2.05-0.8)
=[8又3/4-(21/2+1/8)*8/13]除以1.25
=(8又3/4-84/13-1/13)除以1.25
=(8又3/4-85/13)除以1.25
=(8+3/4 -7+6/13)除以1.25
=(1+39/52+24/52)除以(4/5)
=(115/52)*(4/5)
=23/13
=1又10/13
[8又3/4-(10.5+1/8)*8/13]除以(2.05-0.8)
=[8又3/4-(21/2+1/8)*8/13]除以1.25
=(8又3/4-84/13-1/13)除以1.25
=(8又3/4-85/13)除以1.25
=(8+3/4 -7+6/13)除以1.25
=(1+39/52+24/52)除以(4/5)
=(115/52)*(4/5)
=23/13
=1又10/13