1. (6 points)                      

!(!A*!B+B)

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!(!A*!B) * !B 

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(!!A+!!B) * !B

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(A+B)*!B

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A*!B + B*!B

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A*!B + 0

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A*!B

2. (7 points)                        
!(A*!B+B)

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!(A*!B)*!B

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(!A+!!B)*!B

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(!A+B)*!B

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!A*!B+B*!B

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!A*!B+0

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!A*!B

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!(A+B)

3. (8 points)                        
(A+B)*(A+C)*(!B+!C)

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(A+B*C)*(!B+!C)

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(A*!B)+(B*!B*C)+(A*!C)+(B*C*!C)

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(A*!B)+(0*C)+(A*!C)+(B*0)

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(A*!B)+(0)+(A*!C)+(0)

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(A*!B)+(A*!C)  

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A(!B+!C)

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A*!(B*C)