Answer:
see below
Step-by-step explanation:
Use the distributive property to eliminate parentheses. Remember that the product (-1)(-1) is 1.
a-(1-b)+1 = a -1 +b +1 = a + b . . . . this one
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-(1-a)-b+1 = -1 +a -b +1 = a - b
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(a-1)-(b-1) = a - 1 - b + 1 = a - b
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a-(-b-1)+1 = a +b +1 +1 = a + b + 2
