00011110 00011110 AB AB 00 00 01 10n 11×××|× 11×××× 10 ×× 10 Y=CD+CD W=A+ BC+ BD=A+ B(C+D) X=BC BD+ BCD= B(C+ D)+ BCD Y=CD+CD=C田D L r B D 有共享项。Y = CD +CD Z = D W = A+ BC + BD = A+ B(C + D ) X = BC + BD + BC D = B(C + D ) + BC D Y = CD+CD = C⊕D Z = D 有共享项。 C D AB 00 01 11 10 00 1 1 01 1 1 11 × × × × 10 1 × × C D AB 00 01 11 10 00 1 1 01 1 1 11 × × × × 10 1 × × B W X Y Z C D A