4-1 Boolean Operations and Expressions ◆ Product term(积的形式): is the product of literals, produced by an and gate X=AB. X=AB.X=ACD a product term is equal to I only if each of the literals in the term is 1. A product term is equal to O when one or more of the literals are 0 EX.X=ACD=0.1.0=1 Only if a=0. C=l, and d=0, then x111 4-1 Boolean Operations and Expressions  Product term （积的形式）: is the product of literals, produced by an AND gate. X = AB, X = AB, X = ACD  A product term is equal to 1 only if each of the literals in the term is 1. A product term is equal to 0 when one or more of the literals are 0. Ex. X = ACD = 0 1 0 =1 Only if A=0,C=1, and D=0, then X=1