help

Simplify the following:
1/2--2-1

-(-2)  =  2:
1/2+2-1

Put 1/2+2-1 over the common denominator 2. 1/2+2-1  =  1/2+(2×2)/2-(2)/2:
1/2+(2×2)/2-(2)/2

2×2  =  4:
1/2+4/2-(2)/2

1/2+4/2-(2)/2  =  (1+4-2)/2:
(1+4-2)/2

1+4 = 5:
5-2/2

5-2 = 3:
Answer: | 3/2