Question

数电 （AB+BC+AC）（A+B+C）=?

Answer 1

!(AB + BC + AC) (A + B + C)

=(!A + !B)(!B +!C) (!A + !C)(A + B + C)

=(!A + !B)(!B +!C) (!A B + !A C + !C A + !C B)

=(!A + !B)(!A !B C + A !B !C + !A B !C + A !C + B !C)

=!A !B C + !A B !C + !A B !C + !A !B C + A !B !C + A !B !C

=!A !B C + !A B !C + A !B !C