数字电子内容ABC+非A+非B+非C=1怎么证明啊
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注:以~A表示非A
原式 = ABC + ~A(BC + ~B + ~C) + ~B + ~C 注:BC + ~B + ~C = 1
= ABC + (~A)BC + (~A)(~B + ~C) + ~B + ~C
= BC + ~B + ~C + (~A)(~B + ~C)
= BC + ~B(C + ~C) + ~C + (~A)(~B + ~C)
= BC + ~BC + ~B~C + ~C + (~A)(~B + ~C)
= C + ~C + ~B~C + (~A)(~B + ~C)
= 1 + ~B~C + (~A)(~B + ~C)
= 1
原式 = ABC + ~A(BC + ~B + ~C) + ~B + ~C 注:BC + ~B + ~C = 1
= ABC + (~A)BC + (~A)(~B + ~C) + ~B + ~C
= BC + ~B + ~C + (~A)(~B + ~C)
= BC + ~B(C + ~C) + ~C + (~A)(~B + ~C)
= BC + ~BC + ~B~C + ~C + (~A)(~B + ~C)
= C + ~C + ~B~C + (~A)(~B + ~C)
= 1 + ~B~C + (~A)(~B + ~C)
= 1
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