问答题用公式化简法将下列逻辑函数化为最简与或形式。
(1) Y₁(A，B，C)＝AB'+A'B+AB
(2) Y₂(A，B，C)＝AB'+B+(A+C')'
(3) Y₃(A，B，C，D)＝A+B'CD+A'BD
(4) Y₄(M，N，P，Q)＝MN'Q'+P'Q'+M'N'PQ'

【正确答案】(1) Y₁(A，B，C)＝AB'+A'B+AB
＝(AB'+AB)+(A'B+AB)
＝A(B'+B)+B(A'+A)
＝A+B
(2) Y₂(A，B，C)＝AB'+B+(A+C')'
＝A+B+A'C
＝A+B+C
(3) Y₃(A，B，C，D)＝A+B'CD+A'BD
＝A+B'CD+BD
                     ＝A+(B'C+B)D
                     ＝A+(C+B)D
                     ＝A+BD+CD
(4) Y₄(M，N，P，Q)＝MN'Q'+P'Q'+M'N'PQ'
                         ＝MN'Q'(P+P')+(M'N'+M'N
                         +MN'+MN)P'Q'+M'N'PQ'
                         ＝(MN'P'Q'+MN'PQ'+M'N'PQ'+M'N'P'Q')+P'Q'
                         ＝(MP'+MP+M'P+M'P')N'Q'+P'Q'
                         ＝N'Q'+P'Q'

【答案解析】