8÷4/5+4/5÷8
=10+1/10
=10又1/10
(8又5/6-10.5×4/5)÷4又1/3
=(8又5/6-8.4)÷13/3
=(5/6-2/5)÷13/3
=13/30÷13/3
=1/10
如果本题有什么不明白可以追问,