(1) How to calculate the points on the following four playing cards and get 24? -

(1) The points on the following four playing cards can be calculated in the following two ways to get 24:

We have four playing cards, and each card counts.

Our task is to do some mathematical operations through these points, so the result is 24.

Note that we can only use four basic operations: addition, subtraction, multiplication and division.

Suppose the points of these four cards are A, B, C and D respectively.

Our goal is to find a way of operation so that the results of A, B, C and D are all 24.

There are many ways to make four numbers get 24 in mathematics.

The origin and history of playing cards;

The origin and history of playing cards can be traced back to hundreds of years ago, and the specific place and time of origin are still controversial. It is generally believed that poker was first born in the Tang Dynasty in China, when a card game called "Ganyi" appeared. This kind of playing card consists of 32 cards, which are divided into four colors, namely, barrel, rope, wanhe (domino). Originally, this card game was used for divination and entertainment.

Subsequently, through the Silk Road, this card game spread to other parts of Asia. However, when Catholicism was dominant at that time, Tarot cards were forbidden to be used for divination, and gradually changed from the use of divination to the function of card games. In this process, Tarot cards, the predecessor of playing cards, began to spread all over Europe.

In the19th century, the design and production of playing cards gradually standardized, forming four familiar colors: spades, diamonds, hearts and spades. At the same time, some playing card manufacturers began to print various patterns and symbols on cards to increase the fun and entertainment of the game.

The origin and history of playing cards is a complex and interesting topic, which involves the historical and cultural background of many countries and regions. In the development of playing cards, it has gradually evolved into a global entertainment cultural symbol, which is widely used in games, culture, art and other fields.