In the arithmetic system of early civilizations, the unit fraction appeared in which country or regi

Scores have been available in China for a long time, and the original form of scores is different from what it is now. Later, a similar notation of fractions appeared in India as in China. Later, the Arabs invented the fractional line, and the notation of fractions became what it is today.

More than 200 years ago, the Swiss mathematician Euler said in his book "General Arithmetic" that it is impossible to divide a 7-meter-long rope into thirds, because it is impossible to find a suitable number to represent it

Why is it called a score? The name fraction intuitively and vividly indicates the characteristics of such a number For example, if a watermelon is averaged by four people, don't you divide it into four equal rows? As can be seen from this example, fractions are produced by the need for measurement and mathematics itself—the need for division operations

The first country to use fractions is China There are many records about fractions in ancient China In the book "Zuo Chuan", it is recorded that in the Spring and Autumn Period, the cities of the princes could not exceed those of the Zhou State at the largest, the medium ones could not exceed, and the small ones could not exceed

During the reign of Qin Shi Huang, the number of days in a year was 365 days

Nine Chapters of Arithmetic is a mathematical monograph written in China more than 1800 years ago, of which the first chapter "Fang Tian" talks about the four algorithms of fractions

In ancient times, China used fractions more than a thousand years earlier than other countries, so China has a long history and a splendid culture.

Definition: A number that is smaller than the denominator is called a true fraction.

True fractions are generally discussed in the range of positive numbers.

A fraction with a value less than 1, i.e. a fraction with a numerator less than the denominator (both are positive integers), is called a true fraction, but a fraction value equal to 1 does not count (that is a false fraction).

There is also sometimes a term for a "negative true score", which refers to a negative score with an absolute value of less than 1. There is no maximum true score.

Note: A numerator of 0 is not a true fraction; For example: 0 6, although 0 is less than 6, 0 6 is not a true fraction.

The reason is that "the unit "1" is "divided equally into several parts, and the number of such parts or parts is called a fraction". Example of true fraction: 2 5 (two-fifths), the numerator must be less than the denominator in order to be called a true fraction.

As opposed to true fractions, they are also usually discussed in the range of positive numbers.

A fraction with a value greater than or equal to 1, i.e., a fraction with a numerator greater than or equal to the denominator, is called a false fraction.

If discussed in the entire range of rational numbers, fractions with absolute values greater than or equal to 1 are false fractions.

Fake fractions can often be reduced to fractions or integers. If the numerator and the denominator are multiples, they can be reduced to integers, or if they are not multiples, they can be reduced to fractions.

It's hard to say which country invented it, if it's just the concept of the fraction line, that is, the Swiss mathematician Euler, systematically planned the fraction and the fraction formula, so the fraction line was also invented by him, but according to the relevant historical documents, ancient Egypt, China, India, and Arabia have corresponding records, but the form of expression is different from the present, among which the records of ancient Egypt and China are relatively early

Five cards: 1Project overview card;

2.List of management personnel and supervisor ** card;

3.fire protection system card;

4.Safety production system card;

5.Civilization and environmental protection system card.

A picture: the general plan of the construction site.

According to the third article, the eighth item, the first paragraph of the "Construction Safety Inspection Standards" stipulates that the construction site must be equipped with "five cards and one map", that is, the project overview card, the list of management personnel and the supervision of the first card, the fire protection (fire responsibility) card, the safety production card, the civilized construction and environmental protection card and the general plan of the construction site.

Five cards and one picture, the label specifications are unified.

1. The location is reasonable, the handwriting is correct, the lines are clear, the expression is clear, and it is fixed at the main entrance and exit of the site, and it is strictly forbidden to hang the "five cards and one picture" on the outer scaffolding.

According to the relevant provisions of the state: the construction site must be set up by the provincial construction administrative department of the unified provisions of the "five cards and one map".

According to the relevant provisions: the main entrance of the construction site must be set up by the construction administrative departments of the unified provisions of the "five cards and one map" five cards: 1

Project overview card; 2.List of management personnel and supervisor ** card; 3 .fire protection card; 4 .

Safety production brand; 5 .Civilized construction card. A picture:

Construction site plan.

At present, some areas have been changed to "eight cards and two maps", namely: 1. Project overview and personnel profile; 2. Safety production card; 3. Fire protection card; 4. Ten safety technical measures; 5. Six discipline cards for safety production; 6. Civilized construction card of construction site; 7. "Three treasures, four mouths" protection regulations; 8. Site environmental sanitation system; 9. Construction floor plan; 10. Safety warning signs and floor plans of fire-fighting facilities.

Signage specifications are required to be unified: vertical. length and width (m); Reasonable location: the plaque is set in a prominent position at the main entrance gate; The handwriting is correct, the lines are clear, and the expression is clear.

Project overview card, management personnel list and supervision card, fire protection (fire responsibility) card, safety production card, civilized construction card and construction site plan.

Fire responsibility card, safety and security card, project overview card, main person in charge contact card, environmental protection card, general plan.

1. Floor plan of the construction site.

2. Project overview card.

3. Managers and supervisors.

4. Safe and civilized construction card.

5. Fire protection card.

6. Environmental protection card.

This year's Yijian exam questions, haha.

Five cards refer to:

1. Project overview card

2. List of management personnel and supervision of ** card.

3. Fire protection (fire responsibility) card.

4. Safety production brand.

5. Civilized construction card.

A diagram refers to: the construction site plan.

According to the relevant provisions of the state: the construction site import must be set up by the provincial construction administrative departments uniformly stipulated by the "five cards and one map" five cards: 1

Project overview card; 2.List of management personnel and supervisor ** card; 3 .fire protection card; 4 .

Safety production brand; 5 .Civilized construction card.

One picture: construction site plan.

The Cucutney-Tripoli culture of 5508-2750 BC is the most important in Europe.

It was also one of the earliest civilizations in the world. Homo erectus and Neanderthals migrated from Africa to Europe after the advent of modern humans, Homo sapiens. The earliest European skeletons were found in Damanis, Georgia, 1.8 million years ago.

The earliest biological modern Europeans appeared in 35,000 BC. In the 7th millennium BC there were already traces of primitive settlements in the Balkans. Central Europe reached the Neolithic period in 6000 BC and parts of Northern Europe between 5000 and 4000 BC.

It first originated in Crete in the Aegean Sea of ancient Greece, and belonged to the maritime civilization, and the early civilization was called the classical civilization, and the earliest Greek civilization center in Europe was the earliest in Mycenae, then Athens, and then Rome.

The following is just a personal thought, and the wrong place is scolded.

The earliest civilization in Europe appeared in the Iberian Peninsula called the Iberians, where the early civilizations of Europe (around 4000 BC) (the development of agriculture was key, which was the basis for population growth and agglomeration), and the coinage and writing systems slowly appeared. About 500-1000 years later, a branch of the Iberians crossed the Cretaceous Plateau (where the English Channel is now located) to Britain to work on tin and other metals, and Stonehenge was also their great architectural marvel.

If you want to say the origin of modern civilization in Europe, it should be Greece (the greatest contribution is the political system), Greece partly originated from Egypt, Egypt partly originated from the Sumerians in the valley of the two rivers (the Akkadians, Babylonians and other barbarians learned civilization to the Sumerian barbaric invasion, and later penetrated into Egypt, and the real civilization of Egypt was after 2000 BC), and the Sumerian civilization was very close to the Chinese civilization, but due to racial, political or self-esteem reasons, The white people hide a lot of relevant archaeological discoveries and facts, they just admit that they originated in Egypt and worship its civilization.

It is supposed to have originated from the Minoan civilization on the Italian island of Crete.

[Ancient India].

See also Ancient India.

The world where the Buddha is intertwined with dreams – Indian culture.