Now, we are used to using radical symbols (such as etc. ) and find it simple and convenient to use. Then, how did the radical sign come into being and evolve into what it is now?
In ancient times, Egyptians used the symbol ┌ to represent the square root. Indians write ka in front of the square root number. Used by Arabs. Around 1840, the Germans used the dot "."to represent the square root, two dots "…" to represent the square root of degree 4, and three dots "…" to represent the cube root. For example, .3, ...3, ... 3 represent the square root, quartic square root and cubic root of 3, respectively. By the beginning of the16th century, perhaps because of the fast writing speed, the dot had a slender tail and became "". 1525, Rudolf adopted the radical sign for the first time in his algebra works. For example, he wrote that 4 is 2, 9 is 3, and it is represented by 8, 8. However, this writing method has not been generally recognized and adopted.
At the same time, some people use the capital r of the first letter of the Latin root of the word "root" to indicate the square operation, and then use the first letter q of the Latin word "square" or the first letter c of the "cube" to indicate how many times the square has been opened. For example, at that time, someone wrote R.q.4352, and now it can be written as R.C. using the symbol of mathematician Bunbury (1526-1572). 7p。 "where, R.q. 14╜? ╜ "is equivalent to the brackets used today, and p is equivalent to the plus sign used today (at that time, even the addition and subtraction signs"+"and"-"were not universal).
It was not until17th century that the French mathematician Descartes (1596-1650) first used the radical sign "". In a book, Descartes wrote: "If you want to find the square root of, write it;" If you want to find a cube root, write it. "
What is the consideration? Sometimes, many terms have been squared. In order to avoid confusion, Descartes connected these terms with a horizontal line, and put the root sign √ in front of them (but there is a small hook more than Rudolph's root sign), which is the current form of root sign.
The current cube root symbol appeared very late, and it was not until the eighteenth century that we saw the use of symbols in a book, such as the cube root of 25. Later, radical symbols in the form of "Ru" gradually began to be used.
This shows how difficult it is to adopt a symbol universally. It is the result of long-term continuous improvement, selection and elimination. It is the crystallization of the collective wisdom of several scholars, not invented by one person out of thin air, nor did it fall from the sky.
The root sign is in the form of √ in the computer.
A number indicating that one number is a percentage of another number is called a percentage. Percentages are also called percentages or percentages. Percentages are usually expressed as "%". Percentages are special fractions and cannot be expressed by fractions.
A number indicating that one number is a percentage of another. Percentages are also called percentages or percentages. Percentages are usually represented by the symbol "%"(called percent sign) instead of fractions. For example, 4 1% is written as 4 1%. Since the denominator of the percentage is 100, it is all in 1%.
A number that represents the fraction of one number to another is called a percentage. Percentages are also called percentages or percentages. Percentages are usually not written in the form of fractions, but expressed by adding a percent sign "%"after the numerator. There are many percentages in life:
The weather forecast program on TV will broadcast the weather situation and precipitation probability of that night and tomorrow day every day, prompting everyone to prepare in advance, just like the precipitation probability of tonight is 20%, and there will be a strong wind of 5 ~ 6 in the daytime tomorrow, and the precipitation probability is 10%, so you should add clothes sooner or later. 20% and 10% are clear and concise.
With the rapid development of science and technology, every middle-aged person is now equipped with various styles of mobile phones. Glenn Wilson, a psychologist at Royal College, University of London, has proved that reading short messages with his head down all the time will lead to low work efficiency and slow down the brain reaction ability of staff, and the IQ of people who read short messages often will drop by 10%, which once again proves in percentage form that although mobile phones provide convenience for people, they are very harmful to human health.
This is the information about percentage that I found in my life. I believe that as long as you observe carefully, you will also find that percentage is everywhere in your life.
A number indicating that one number is a percentage of another. Percentages are also called percentages or percentages. Percentages are usually not written in the form of fractions, but are represented by the symbol "%"(called percent sign). For example, write 4 1% and 1% respectively. Since the denominator of percentages is 100, they are all 65438+. Percent (symbol%) is a way to express the numerical value of a proportion, ratio or fraction, using 100 as the denominator. For example, 1% means one percent, or1100 or 0.0 1, 82% means 82%, or 82/ 100 or 0.82. Percentage's English name is percent, so it is also translated into Eight Immortals. On the other hand, Taiwan Province Province is used to saying "pa", which comes from the Japanese character "パーセント" (Pā sento).
A number indicating that one number is a percentage of another number is called a percentage. Percentages are also called percentages or percentages. Percentages are usually expressed as "%". Percentages are special fractions and cannot be expressed by fractions.
A number indicating that one number is a percentage of another. Percentages are also called percentages or percentages. Percentages are usually represented by the symbol "%"(called percent sign) instead of fractions. For example, 4 1% is written as 4 1%. Since the denominator of the percentage is 100, it is all in 1%.
A number that represents the fraction of one number to another is called a percentage. Percentages are also called percentages or percentages. Percentages are usually not written in the form of fractions, but expressed by adding a percent sign "%"after the numerator. There are many percentages in life:
The weather forecast program on TV will broadcast the weather situation and precipitation probability of that night and tomorrow day every day, prompting everyone to prepare in advance, just like the precipitation probability of tonight is 20%, and there will be a strong wind of 5 ~ 6 in the daytime tomorrow, and the precipitation probability is 10%, so you should add clothes sooner or later. 20% and 10% are clear and concise.
With the rapid development of science and technology, every middle-aged person is now equipped with various styles of mobile phones. Glenn Wilson, a psychologist at Royal College, University of London, has proved that reading short messages with his head down all the time will lead to low work efficiency and slow down the brain reaction ability of staff, and the IQ of people who read short messages often will drop by 10%, which once again proves in percentage form that although mobile phones provide convenience for people, they are very harmful to human health.
This is the information about percentage that I found in my life. I believe that as long as you observe carefully, you will also find that percentage is everywhere in your life.
A number indicating that one number is a percentage of another. Percentages are also called percentages or percentages. Percentages are usually not written in the form of fractions, but are represented by the symbol "%"(called percent sign). For example, write 4 1% and 1% respectively. Since the denominator of percentages is 100, they are all 65438+. Percent (symbol%) is a way to express the numerical value of a proportion, ratio or fraction, using 100 as the denominator. For example, 1% means one percent, or1100 or 0.0 1, 82% means 82%, or 82/ 100 or 0.82. Percentage's English name is percent, so it is also translated into Eight Immortals. While Taiwan Province province is used to saying "Pa", which is taken from the provincial name of "パーセント" (Pā sento) in Japanese. Percent comes from the Latin per centum, where per means "every" and centum means "hundred".
App application
Although the denominator of the percentage is 100, the numerator can be greater than 100, for example, 200% means twice the original number. For example, a company's net profit last year was 6.5438+0.2 million yuan, and this year's net profit was 6.5438+0.2 million yuan, which can be expressed as "this year's net profit increased by 20% compared with last year" or "this year's net profit increased by 654.38+0.20% compared with last year", but this writing method is rarely used.
Percentages are sometimes misleading. Many people think that the percentage increase will be offset by the same percentage decrease, for example, an increase of 50% from 100 equals 100+50, that is, 150. And a 50% reduction from 150 is 150-75, which is equal to 75. The final result is less than the original number 100.
The province said. Percent comes from the Latin per centum, where per means "every" and centum means "hundred".
The application property indicates that one number is a percentage of another number, which is called a percentage. Percentages are also called percentages or percentages. Percentages are usually expressed as "%". Percentages are special fractions and cannot be expressed by fractions. A number indicating that one number is a percentage of another. Percentages are also called percentages or percentages. Percentages are usually represented by the symbol "%"(called percent sign) instead of fractions. For example, 4 1% is written as 4 1%. Since the denominator of the percentage is 100, it is all in 1%. A number that represents the fraction of one number to another is called a percentage. Percentages are also called percentages or percentages. Percentages are usually not written in the form of fractions, but expressed by adding a percent sign "%"after the numerator. There are many percentages in life: every day in the weather forecast program on TV, the weather situation and precipitation probability of the night and tomorrow will be reported, prompting everyone to prepare in advance, just like the precipitation probability of tonight is 20%, there will be a strong wind of five to six tomorrow, and the precipitation probability is 10%, so you should add clothes sooner or later. 20% and 10% are clear and concise. With the rapid development of science and technology, every middle-aged person is now equipped with various styles of mobile phones. Glenn Wilson, a psychologist at Royal College, University of London, has proved that reading short messages with his head down all the time will lead to low work efficiency and slow down the brain reaction ability of staff, and the IQ of people who read short messages often will drop by 10%, which once again proves in percentage form that although mobile phones provide convenience for people, they are very harmful to human health. This is the information about percentage that I found in my life. I believe that as long as you observe carefully, you will also find that percentage is everywhere in your life. A number indicating that one number is a percentage of another. Percentages are also called percentages or percentages. Percentages are usually not written in the form of fractions, but are represented by the symbol "%"(called percent sign). For example, write 4 1% and 1% respectively. Since the denominator of the percentage is 100, it is all 65438+. Percent (symbol%) is a way to express the numerical value of a proportion, ratio or fraction, using 100 as the denominator. For example, 1% means one percent, or1100 or 0.0 1, 82% means 82%, or 82/ 100 or 0.82. Percentage's English name is percent, so it is also translated into Eight Immortals. While Taiwan Province province is used to saying "Pa", which is taken from the provincial name of "パーセント" (Pā sento) in Japanese. Percent was originally derived from the Latin percentum, per means "every" and centum means "hundred". Although the denominator of the applied percentage is 100, the numerator can be greater than 100, for example, 200% means twice the original number. For example, a company's net profit last year was 6.5438+0.2 million yuan, and this year's net profit was 6.5438+0.2 million yuan, which can be expressed as "this year's net profit increased by 20% compared with last year" or "this year's net profit increased by 654.38+0.20% compared with last year", but this writing method is rarely used. Percentages are sometimes misleading. Many people think that the percentage increase will be offset by the same percentage decrease, for example, an increase of 50% from 100 equals 100+50, that is, 150. And a 50% reduction from 150 is 150-75, which is equal to 75. The final result is less than the original number 100.
Although the denominator of the percentage is 100, the numerator can be greater than 100, for example, 200% means twice the original number. For example, a company's net profit last year was 6.5438+0.2 million yuan, and this year's net profit was 6.5438+0.2 million yuan, which can be expressed as "this year's net profit increased by 20% compared with last year" or "this year's net profit increased by 654.38+0.20% compared with last year", but this writing method is rarely used.
Percentages are sometimes misleading. Many people think that the percentage increase will be offset by the same percentage decrease, for example, an increase of 50% from 100 equals 100+50, that is, 150. And a 50% reduction from 150 is 150-75, which is equal to 75. The final result is less than the original number 100.
Words: percentage
B?·?· Athena Chu
Interpretation: Also known as "percentage" and "percentage". Write the ratio of two quantities in the form of a 100, and record it as%. The symbol "%"is called the percent sign. Such as 0. 14= 14%.
For example, if 1/5 is 20%, with 100 as the denominator ~