式中的card表示元素个数容斥原理的核心思想就是:重了减,漏了补举个例子A=昨天看了某电影的人B=今天看了该电影的人则有A∪B=这两天内看过该电影的人A∩B=这两天都看了该电影的人于是“两天内看过该电影的人数”=“昨...

a∩b是a交b的意思，即集合a与集合b的公共部分。 aUb是a并b的意思，即集合a与集合b的所有。 例如：两个集合A {1，2，3}，B {1，2，4，5}。 则A∩B表示集合AB共有的元素，即 {1，2}。 （1）若两个集合A和B的交集为空，则说他们没有公共元素，写作：A∩B = ∅。 （2）任何集合与 空集 的交集都是空集，即A∩∅=∅。 （1）空集是并集运算的单位元。 即 ∅ ∪A=A。 对任意集合A，可将空集当作零个集合的并集。 并集和交集相互满足分配律，而且这三种运算满足德·摩 …

Cardano is a proof-of-stake blockchain platform: the first to be founded on peer-reviewed research and developed through evidence-based methods. It combines pioneering technologies to provide unparalleled security and sustainability to decentralized applications, systems, and societies.

The live Cardanum price today is $0 USD with a 24-hour trading volume of $0 USD. We update our CARDA to USD price in real-time.

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截至 2025年3月17日，Cardanum (CARDA) 的當前交易價格為 $NaN。 過去 24 小時內，幣價介於 $-- 至 $-- 之間，交易量為 $--。 總市值為 $--，在加密貨幣中排名第 --。 一枚 Cardanum 的價 …

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Cardanum 今日价格 为 ¥0 CNY，其 24 小时的交易量为 ¥0 CNY。 我们会实时更新CARDA兑换为CNY的价格。

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