Помогите!!! номер 1 ,б 2,в
1б) 8/13×(-2,81-1,09)=8/13×(-3,9)=8/13×(-39/9)=-8/3=-2 2/3 2в)4/13×(6,5n-3 1/4m)-3,2×(5/8n-0,5m)= 4/13×13/2n-4/13×13/4m-16/5×5/8n+16/5×5/10m= 2n-m-2n+1,6m=-m+1,6m=0,6m