4целых 2/3 -5/9*2 целых 4/7: (2 целых 1/7+1 целая 2/3)+0,8*1,25=

4 2/3-5/9×2 4/7÷(2 1/7+1 2/3)+0.8×1.25=
=4 2/3-5/9×18/7÷(15/7+5/3)+1=
=5 2/3-10/7÷(45/21+35/21)=
=5 2/3-10/7÷80/21=5 2/3-10/7×21/80=
=5 2/3-3/8=17/3-3/8=136/24-9/24=127/24=
=5 7/24