文恩图( Venn diagram)检验 A∩B A∩B=A∪B AU(A∩B)=A (A∩B)∪(AB)=A A∪B=(AnB)∪(AnB)(AB) A(B∩C)=(A∪B)∩(AUC 2021-01-26 102021-01-26 10 文恩图（Venn diagram）检验 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) A B A B A A B A A B A B A A B A B A B A B A B C A B A C  =    =    =  =        =    A B 