card(A∪B∪C),card(A),card(B),card(C),card(A∩B),card(B∩C),card(A∩C),card(A∩B∩C)之间的关系是什么?

card(A∪B∪C),card(A),card(B),card(C),card(A∩B),card(B∩C),card(A∩C),card(A∩B∩C)之间的关系是什么? card(A∪B)=card(A)+card(B)-card(A∩B) card(A∪B)=card(A)+card(B)-card(A∩B) 那card(A∪B∪C)=? Card(A∪B∪C)=? 集合中card（A∪B∪C）≤min{card(A∩B),card(B∩C),card(C∩A)}什么意思 card（A∪B∪C）=card（A）+card（B）+card（C）-card（A∩B）-card（A∩C）-card（B∩C）+card（A∩B∩C我只能举例子然后算出来,但还是不太懂 集合元素个数的公式推导公式是card(AUBUC)=card(A)+card(B)+card(C)-card(A交B)-card(A交C)-card(B交C)+card(A交B交C) 关于容斥原理:给我解释一下card(A并B 并C 并D)=card(A)+card(B)+card(C)+card(D)-card(A交B）-card（A交C）-card（A交D）-card(B交C）-card（B交D）-card(C交D）+card（A交B交C）+card（A交B交D）+card（A交C交D）+card（B 选择.Let's buy a _____for our gyandparents.A.New Year Card B.new year card C.New Year card 有限集合S中元素的个数记作card(S),设A,B都为有限集合,给出下列命题:(1)A∩B=空集的充要条件是card(A∪B)=card(A)+card(B);(2)A包含于B的充要条件是card(A)≤card(B);(3)A并B的充要条件是card(A)≤card(B);(4)A=B 有限集合S中元素的个数记作card(S),设A,B都为有限集合,给出下列命题:(1)A∩B=空集的充要条件是card(A∪B)=card(A)+card(B);(2)A包含于B的充要条件是card(A)≤card(B);(3)A并B的充要条件是card(A)≤card(B);(4)A=B Can you __?A.show your card me B.show me your card C.show to me youe card D.show me to your card Can you __?A.show your card me B.show me your card C.show to me your card D.show me to your card Look( )this card .Is it your card?选则：A.at B.in C.on D.for 已知card(A)=n,card(C)=m（n card(A并B)=card(A)+card(B)-card(A交B),其中card(A并B)的意义是什么? Is this _ card?yes _ card is tom`s 选择:A.a;the B.a;A C.the;A Everyone_____a birthday card.A.like B.likes C.does