(2/5+1/3)÷4/5+3/4
=2/5÷4/5+1/3÷4/5+3/4
=2/5*5/4+1/3*5/4+3/4
=1/2+5/12+3/4
=6/12+5/12+3/4
=11/12+9/12
=5/3