Explanation:
(0.5-2)-1 = -1.5 - 1
= -2
(3+4) -2 = 7 - 2
= 5
(-8+5)+3 = -3+3
= 0
-(0.5-2)+1 = -(-1.5)+1
= +1.5 + 1
= 2.5
-(3+4)+2 = -(7) +2
= -5
-(-8-5) -3 = -(-13) -3
= +13 -3
= 10
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