数字电路逻辑表达式的化简，第二题怎么华啊，求大神

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'