Answer:
In an expression with parentheses, we first perform the calculations in parentheses
In an expression without parentheses, multiplications and divisions are performed before additions and subtractions.
1) 6-(1+1)= 6-2=4
2) (1+1)+2 =2+2 = 4
3) 6×2 +2 =12+2 =14
4)2×4×2=16
5) 3 (3-5)= 3-2=1
6)3+4+3 = 10
7) 5+6+2 = 13
8) 5×6-3=30-3=27
9) 6+5-3 =11-3 =8
10) (6-1)×3 =5×3=15
11) 12+2²= 12+4 =16
12) 6:-(5-3)= 6:2=3