1. 17
2. 13
3. 10
4. 50
5. 30
6.1 0
7. 9
8. 30
9. 11
10.20
11. 90
12. 60
(12+8)-3=17
(30-10)-7=13
(40+20)-50=10
(50+(20+20)=90
20+(70-60)=30
5+(8+2)=15
(17+3)-11=9
20+(40-30)=30
(9+10)-8=27
9+(17-6)=20
80+(0+10)=90
(90+10)-40=60
1. 17
2. 13
3. 10
4. 50
5. 30
6.1 0
7. 9
8. 30
9. 11
10.20
11. 90
12. 60
(12+8)-3=17
(30-10)-7=13
(40+20)-50=10
(50+(20+20)=90
20+(70-60)=30
5+(8+2)=15
(17+3)-11=9
20+(40-30)=30
(9+10)-8=27
9+(17-6)=20
80+(0+10)=90
(90+10)-40=60