6+6-1; 6-(11-6);5+(18-9);

Question

6+6-1; 6-(11-6);5+(18-9);

Answer 1

1)6+6-1=11
2)6-(11-6)=1
5+(18-9)=14

Answer 2

6+6-1=11; 6-(11-6)=6-5=1; 5+(18-9)=5+9=14.