X1
X5
X1X2
X2
X3X4
T=X1+X2(X1+X2)+X3X4=X1+X1X2+X2X2+X3=X1+X2+X3X4吸收律:A+AB=A X1+X1X2=X1,幂等律:A*A=A A+A=A X2X2=X2所以上式变为X1+X2+X3X4
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