Square of M - cube of N + N-M

Square of M - cube of N + N-M

Original formula = (M + n) (m-n) - (m-n)
=(M+N-1)(M-N)

What does the number 9 mean?

In the book Shuxue shisanjiu written by Wang Zhong in the Qing Dynasty, it is said that "if one or two can't be exhausted, it will be about three to see the number; if three can't be exhausted, it will be about nine to see the number.", Finally nine Yan. "Think" Nine "is the highest number, more than nine, will enter one, back to" one ". Therefore, since ancient times, often used" Nine "means" more "
For example: "Jiuhe Princes": This is a story recorded in history that Duke Huan of Qi met the princes. "Jiu" does not mean nine times, but many times; "Jiuqu Yellow River" does not mean that there are nine bends in the Yellow River, but many bends; "jiu" in "Jiusi Yimao" does not mean that there are nine deaths, but many hardships; "jiu" in "jiuniu Yimao" does not mean that there are nine cows, The ancient saying "heaven is nine days, earth is nine continents, the moon is nine paths, and the sun has nine lights" also means many
The meaning of "jiu" from "Duo" extends to "Gao" and "Shen". For example, "jiu" in "Jiu Xiao", "Jiu Chong Tian", "Chong Xiao Jiu" and "Jiu Quan Xia"
"Nine" means many, For example, "eighteen kinds of martial arts", "Eighteen rolls on the spot", "women's eighteen changes", "Eighteen levels of hell", "thirty six strategies", "seventy-two lines", "seventy-two changes", "ninety-nine and eighty-one difficulties", "three hundred and sixty lines", "nine thousand years old (a powerful official under one person and over ten thousand people)" and "one somersault over eighteen thousand miles" The numeral of "Duo" also means "Duo"
"Nine" is the highest number, and it is homonymous with "jiu", so it has been loved by people since ancient times. Emperors of all dynasties loved "Nine" more. They wore nine dragon robes and built nine dragon walls to make the world permanent, The world-famous Imperial Palace (Forbidden City) has become a kingdom of nine. The three main halls (Taihe hall, Zhonghe hall and Baohe Hall) are all nine feet in height. The golden nails on the gates of all the palaces, halls, big and small cities in the Forbidden City are also nine rows horizontally and vertically, A total of 9981; the number of steps is also nine or a multiple of nine; the total number of palaces and houses in the Forbidden City is 9999 (half); where the emperors went, such as the temple of heaven and the summer palace, most of the buildings were based on "Nine"
In Shiji Wudi Ji, it is said that "Yu collected the gold of Jiumu and cast Jiuding like Jiuzhou." Jiuding became the most important national treasure in legend, and left the idiom of "one word Jiuding" to show the weight of speech. Within the central ruling group, there were nine official positions, from Qin and Han Dynasties to Qing Dynasty, The emperors of the past dynasties did not have long-term stability. They just used the homophony of "jiu" and "jiu" to express the desire of "long live" and "long live"
The folk in our country also have a preference for "Nine", which is reflected in the fact that "Nine" is used as the unit of measurement in everything. "Counting nine" is an example. According to the records of the first year of Jingchu in the Liang Dynasty of the Southern Dynasty, "the winter solstice and 9981 days are commonly used as the cold days of the year.", In the Ming Dynasty, there appeared "painting nine", and in the Qing Dynasty, it developed into "writing nine". Whether it is "number", "painting" or "writing", it takes "Nine" as the standard number to outline the weather change in winter

Numbers 1 to 9 mean

1 stands for the only love
Two represents the world of two
Three represents dispersion, and the two sides are separated, but the missing will never change
4 represents endless missing
5 is what I mean, it can also be understood as regardless of you and me
6 for smooth, on behalf of comedy love, the love of both sides will be plain sailing, happy life
7 stands for sad, on behalf of love is destined to experience ups and downs, perhaps in the middle of a very painful thing, but both sides to spend with love
8 can be seen as two zeros together, which is the most romantic one. The indicator is the appearance of two people shoulder to shoulder
9 stands for forever. I love you forever
10 stands for perfect, perfect love

The meaning of the number 9
Does the number 9 mean "all"
A design needs~
thank you
In our history and culture, and in foreign cultures, does the number 9 have the meaning of "all"?

Sanjiaojiuliu, commonly known as "Sanjiaojiuliu", is a complex and diverse social figure. It generally refers to all kinds of schools in religion, academia or all kinds of industries in society. It is also used to refer to all kinds of people in the river and lake. In fact, in ancient times, Sanjiaojiuliu did refer to it
Nine covers everything

What does the symbol on the bottom of a plastic bottle represent

The number 1 stands for pet, that is, polyethylene terephthalate mineral water bottles, carbonated beverage bottles are made of this material. The number 3 stands for PVC, that is, common raincoats, building materials, plastic films, plastic boxes, etc

Plastic bottle bottom mark
There is a recyclable triangle sign on the bottom of the plastic bottle. There is a number in it. I heard that bottles with different numbers have different uses, such as how much centigrade hot water they can hold. Could you please list the meanings of each number,

Pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet pet
HDPE high density polyethylene of standard 2 is commonly used as white medicine bottles, cleaning products and bath products. It should not be used as water cups or storage containers to hold other items. If it is not thoroughly cleaned, it should not be recycled
Standard 3 PVC is commonly used in raincoats, building materials, plastic films, plastic boxes, etc. it has good plasticity and low price, so it is widely used. It can only resist heat at 81 ℃. It is easy to produce bad substances at high temperature, and is rarely used in food packaging. It is difficult to clean and easy to remain, so do not recycle. If it is used for drinks, do not buy it
The common preservative film, plastic film, etc. of standard 4 PE polyethylene. When the temperature is high, there are harmful substances. After the toxic substances enter the human body with food, it may cause breast cancer, neonatal congenital defects and other diseases. Do not put the preservative film into the microwave oven
The melting point is 167 ℃, which is the only plastic box that can be put into the microwave oven. It can be reused after careful cleaning. It should be noted that some microwave oven boxes are made of No.5 PP, but the box cover is made of No.1 PE. Because PE can not withstand high temperature, it can not be put into the microwave oven together with the box body
Standard 6 PS polystyrene is commonly used in bowl type instant noodles boxes and snack boxes. It should not be put into the microwave oven to avoid releasing chemicals due to high temperature. After filling acid (such as orange juice) and alkaline substances, carcinogens will be decomposed. Avoid packing hot food in fast food boxes. Do not use the microwave oven to cook bowl type instant noodles
Standard 7 PC other common water bottles, space cups, milk bottles. Department stores often use this kind of water cup as a gift. It is easy to release the toxic substance bisphenol A, which is harmful to human body. Do not heat it when using, and do not directly bask in the sun

What do the labels on the bottom of the plastic bottle represent?

There is a triangle with an arrow at the bottom of the mineral water bottle. There is a number in the triangle;
General mineral water bottle, bottom marked 1 & shy;
Nongfu mountain spring 4-liter, bottom marked 2 & shy;
The plastic heat-resistant cup for making tea is marked with 5 & shy; & shy;
Pet polyethylene terephthalate & shy;
Common mineral water bottles, carbonated beverage bottles, etc. are easy to deform when heat resistance reaches 70 ℃, and harmful substances melt out. No. 1 plastic may release carcinogen DEHP after 10 months of use. Do not put it in the car in the sun; do not put alcohol, oil and other substances in it;
HDPE high density polyethylene & shy;
Common white medicine bottles, cleaning products, bath products. Don't use them as water cups or storage containers to hold other items. If the cleaning is not complete, don't recycle them;
PVC & shy;
Common raincoats, building materials, plastic films, plastic boxes, etc. have good plasticity and low price, so they are widely used. They can only withstand heat at 81 ℃. They are easy to produce bad substances at high temperature, and are rarely used in food packaging. They are difficult to clean and easy to remain, so don't recycle them. If you pack drinks, don't buy them;
PE polyethylene & shy;
The common preservative film, plastic film, etc. when the temperature is high, there are harmful substances. When the toxic substances enter the human body with food, it may cause breast cancer, neonatal congenital defects and other diseases;
PP & shy;
The melting point is 167 ℃, which is the only plastic box that can be put into the microwave oven. It can be reused after careful cleaning. It should be noted that some microwave oven boxes are made of No.5 PP, but the box cover is made of No.1 PE. Because PE can't withstand high temperature, it can't be put into the microwave oven together with the box body;
&Shy; PS polystyrene & shy;
Do not put it in the microwave oven to avoid the release of chemicals due to high temperature. After filling acid (such as orange juice) and alkaline substances, it will decompose carcinogens. Avoid packing hot food in the fast food box. Do not use the microwave oven to cook instant noodles;
&Shy; PC other classes & shy;
Water bottles, space cups and milk bottles are common. Department stores often use water cups made of this material as gifts. It's easy to release toxic substance bisphenol A, which is harmful to human body. Don't heat them when using them, and don't directly sun them in the sun;

The meaning of the numbers at the bottom of all kinds of plastic bottles

"No.1" pet: mineral water bottle, carbonated beverage bottle, etc.  beverage bottle recycling use, hot water use: heat resistance to 70 ℃, only suitable for warm or frozen drinks, high temperature liquid, or heating is easy to deform, there are harmful substances melt out. And, scientists found that No.1 plastic used for 10 months, may release carcinogenic

What is the meaning of the inner triangle of a plastic bottle?

Figure 1 in triangle of plastic bottle bottom: pet polyethylene terephthalate
Common mineral water bottles, carbonated beverage bottles, etc. are easy to deform when heat resistance reaches 70 ℃, and harmful substances melt out. No. 1 plastic may release carcinogen DEHP after 10 months of use. Do not put it in the car in the sun; do not contain alcohol, oil and other substances
Figure 2 in the triangle at the bottom of plastic bottle: HDPE
Common white medicine bottles, cleaning supplies, bath products. Do not use them as water cups or storage containers to hold other items. Do not recycle if the cleaning is not complete
Figure 3 in triangle of plastic bottle bottom: PVC
Common raincoat, building materials, plastic film, plastic box, etc. good plasticity, low price, so it is very common to use, can only heat 81 ℃. When the temperature is high, it is easy to have bad substances, rarely used in food packaging. It is difficult to clean, easy to residue, do not recycle. If you pack drinks, do not buy
Figure 4 in the triangle at the bottom of plastic bottle: PE
Common preservative film, plastic film, etc. when high temperature, there are harmful substances, toxic substances with food into the human body, may cause breast cancer, neonatal congenital heart disease