1) Y = AB'C+A'+B+C' = A'+B'C + B + C' = A'+B+C+C' = 1
2) Y = A(C'+CD') + ABC+CD
= A(CD)'+CD+ABC
= A+ABC+CD
= A+CD
3) Y = BC'+B'(A+D)(A'+D')+B(AD'+A'D)
= BC'+(B'+B)(AD'+A'D)
= BC'+(A异或D)
4)F=AB'+BC'D+AC'D + C'D'+ABC' 最后一项移前面，被1，2项吸收
=AB'+BC'D + C'D'+ABC'
=A(B'+BC')+C'(BD+D') A+A'B=A+B
=A(B'+C')+C'(D'+B)
=AB'+AC'+C'D'+BC'
=(AB'+BC'+AC') +C'D' AC'被吸收
=AB'+C'D'+BC'
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