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追答74ls151 真值表。
有
Z = not(A2)not(A1)not(A0)D0 + not(A2)not(A1)A0D1 + not(A2)A1not(A0)D2 + not(A2)A1A0D3 + A2not(A1)not(A0)D4 + A2not(A1)A0D5 + A2A1not(A0)D6 + A2A1A0D7
代入
D0 = D1 = D2 = D3 = D;
D2 = 1;
D6 = not(D);
D3 = D7 = 0;
得
Z = not(A1)D + not(A2)A1not(A0) + A2A1not(A0)not(D)