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Is the system of equations x = 1 (1) y + 2 = 3 (2) a system of linear equations of two variables? Do the two equations of the system of linear equations of two variables have to contain two unknowns? Isn't a system of linear equations of two variables only composed of two linear equations of two variables?
It's a system of linear equations of two variables
It is not necessary for the two equations of binary linear equations to have two unknowns
The size of sliding friction has nothing to do with which two factors? One is the area of the contact surface and the movement of the object ()
The calculation formula of sliding friction f = μ n, in which μ is called dynamic friction coefficient, also called sliding friction coefficient. It is only related to the material and the roughness of the contact surface, but has nothing to do with the contact area. N is the positive pressure. N = g = mg m, and the mass g of the object is a constant
So you are wrong to fill in the blanks
If the equation | x + 1 | + a = 0 has no solution, there is only one solution for | 2X-4 | + B = 0, and | 3x + 2 | + C = 0 has two solutions, then what is the size relationship of a, B, C?
|X + 1 | + a = 0 has no solution, indicating that - A is less than 0, that is, a is greater than 0
|There is only one solution for 2X-4 | + B = 0, which means - B = 0, that is, B = 0
|There are two solutions for 3x + 2 | + C = 0, indicating that - C is greater than 0, that is, C is less than 0,
So the size relation is a greater than b greater than C
How many kilometers per second can a car travel 60 kilometers per hour
6m
Given the set a = {1, 2, 3}, B = {2, 3, 4}, then a ∪ B = ()
A. {2，3}B. {1，4}C. {1，2，3，4}D. {1，3，4}
∪ set a = {1, 2, 3}, B = {2, 3, 4}, ∪ a ∪ B = {1, 2, 3, 4}
A ^ 3-5a ^ 2 + 5a-1 (factorization)
a^3-5a^2+5a-1
=(a³-1)-5a(a-1)
=(a-1)(a²+a+1-5a)
=(a-1)(a²-4a+1)
There are four kinds of fruit in the fruit shop. The weight of pear is 4 / 5 of that of apple, the weight of orange is 6 / 25 of that of the other three kinds of fruit, and the weight of banana is 7 / 24 of that of the other three kinds of fruit,
You are 100% short of a condition, such as the total weight of fruit... Because there are several unknowns, there must be several equations to get the only answer!
A bottle of water poured a third of the water and then poured a third of the wine, and then poured a quarter of the water and then poured a quarter of the wine. At this time, what percentage of the wine in a bottle
Wine = 1 × (1-1 / 3) × (1-1 / 4) = 1 / 2
Wine accounts for 50% of a bottle
How many cubic meters is one liter
1 liter = 0.001 cubic meter, 1 milliliter = 1 cubic centimeter. I've also been confused. The key is 1 DM3
1l=0.001m3
1l=1dm3
1l=1000cm3
1ml=1cm3
The fruit shop has 480 kg of fruit, 38 of which are apples, and the others are apples______ Kg. 56 of all apples sold in 3 days, sold______ A kilogram of apples
480 × 38 = 180 (kg) a: there are 180 kg apples. 180 × 56 = 150 (kg) a: 150 kg apples are sold
RELATED INFORMATIONS
- 1. Four seasons reading answers of comprehensive rain detection in the second volume of seventh grade Chinese exercise book
- 2. Answers to the matching exercise book of the people's education press of the people's Republic of China
- 3. There should be social drama, Ansai waist drum, great tragedy, in the center of the desert, gazelle flying, cat reading comprehension. The more the better
- 4. Economy is a virtue Every citizen has a sense and behavior of saving. The reason why the sense and behavior of saving is more important is that it is more common, more lasting and more effective. The government's policy and behavior can only benefit for a while, only when saving is internalized into every citizen's conscious behavior, This thrifty society naturally came into being. Being warm, kind, respectful, thrifty, yielding, diligent and thrifty have been the virtues of the Chinese nation since ancient times. But today, the implementation of the market economy has brought great wealth to the country and individuals. At the same time, the fine traditional virtues and style of "saving" the nation and the Communist Party of China have gradually been weakened, Today, to promote the construction of a conservation oriented society is not only the requirement of government work, but also the expectation of personal life style Saving, as a virtue, has two realms and levels for individuals: Saving Private Property and saving public property. Saving private property is to cherish the fruits of one's own labor, which is a kind of private virtue. Saving at this level is easy to achieve, but when a person has private material wealth to a certain extent, due to the difference of quality, it is difficult to achieve, It is not easy for some people to economize and cherish their wealth and the fruits of their labor. Moreover, the society can not interfere with the private morality of individuals, no matter from the perspective of moral or legal constraints. Because of this, many people have the mentality of "how I spend my own money anyway" when they are extremely extravagant and wasteful, It is a kind of public morality to cherish the public property and the collective fruits of common labor. Compared with the previous level, the level of saving is higher, but it is also more difficult to achieve. Here, we can only appeal: waste of public property is equal to waste of private property in essence. Because this public property is your own hard-earned money Today's developed countries have unparalleled wealth in developing countries, but in these developed countries, no matter the government, enterprises or individuals are actually very thrifty, saving even makes you have this impression: from the perspective of whether the government departments spend fiscal (taxpayer's) money, or the way enterprises and individuals spend their own money, Rich and developed countries are more like poor and backward countries, while those poor and backward countries are more like developed countries. For example, Toyota's output value today has reached hundreds of billions of dollars, and one company has surpassed several Guangdong provinces. But do you know that the employees there still use used copy paper as notes. Moreover, this is not an individual phenomenon, it is common for people, Let alone the government spending money, because they know that every penny is taxpayers' money. By contrast, our government, enterprises and even individuals are not ashamed. Not only do people not easily spend their own money, but also they dare not spend their public money. We are not so much spending our own money, let alone the public money, On the contrary, it doesn't matter when the economical society and the harmonious society will be As a virtue, economy has two realms for individuals. Which two words are used to summarize these two realms? 15. Why is the waste of public property equal to the waste of private property? 16. Please add an example of economy to paragraph 3 to make the argument more sufficient 17. Saving is a new topic. You must have many excellent saving behaviors. Please choose two of them and talk about the significance of doing so
- 5. Answers to lesson 6 in Chinese exercise book
- 6. Answers to Lesson 18 in the Chinese exercise book of the fifth grade of primary school published by Jiangsu Education Press
- 7. Four answers to the reading questions in the exercise book 4. An unforgettable thing After school on Tuesday afternoon, I took my neighbor's little sister to the street The street was full of people. We came to an old man's toy stand and saw a beautiful comb. I asked him, "how much is this comb?" "fifty cents, it's very convenient," he said. I took out fifty cents and gave it to him. I put a comb in my pocket and went back Children, come back quickly, we'll come back quickly. Why didn't you take the comb? My grandfather said while he put a comb into my hand. I hesitated for a while and left with the comb When I got home, I told my mother all about it. My mother criticized me severely, saying that I took advantage of others and asked me to send back my comb and apologize to my grandfather. Thinking of my grandfather's kind face and sincere expression, I felt that I didn't deserve to be a young pioneer, so I decided to return my comb The next day after school, I went to find my grandfather, but I didn't find him. I didn't see him for five days Although it's been a long time, I feel guilty when I think about it 1. Use "√" to punctuate the passage and choose the correct pronunciation 2. Punctuate the third paragraph of the passage 3. Write the synonyms of the following words Exquisite () hurry () hesitation () guilt () 4. Why does the old man who sells combs shout "we" back? From here we can see what kind of person he is? ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ 5. Why should I return my comb and admit my mistake to my grandfather? ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
- 8. New leaf's reading answers unit 1 test of basic training newly compiled by people's Education Press, 1. Use tick to add some words to the text and choose the correct pronunciation Write a phrase in green and crisp The transition section in the article is the natural section. Its function is to carry on the sentence and open the next sentence 4. Write poems about infinite blue and other red 5. Draw the sentences of green leaves' Enlightenment to life in the original text with wavy lines
- 9. Exercise of "if there is no dust" in Lesson 12 of Chinese for Grade 5 of PEP
- 10. If there is no dust!
- 11. If 12x2m − 1 − 8 ＞ 5 is a linear inequality of one variable, then M=______ ．
- 12. This year, 56 students in a class have subscribed to "junior high school students' Mathematics Learning". In the first half of this year, 25 boys and 15 girls have subscribed to the magazine. In the second half of this year, 26 boys and 25 girls have subscribed to the magazine, and 23 boys have subscribed to the magazine all year round. So the number of girls who have subscribed to the magazine only in the first half of this year is 25______ Name
- 13. (x+y)(x2-xy+y2)
- 14. Decomposition factor: (1) 2A (x-a) + B (A-X) - 3C (x-a) (2) (a ^ 2 + 1) ^ 2-4a ^ 2 (3) x ^ 2-2xy + y ^ 2 + X-Y
- 15. 810x811x812.x2011 divided by the maximum value of n power of 810 (the result is a positive integer) n
- 16. If the decimal point of a number is moved two places to the right, the number obtained is 118.8 larger than the original number, and the original number is ()
- 17. Given A-B = 2, B-C = 1, find the value of the algebraic formula A ^ 2 + B ^ 2 + C ^ 2-ab-bc-ac
- 18. 3060 cm3=______ Decimeter 3=______ It's a liter
- 19. As shown in the figure, the masses of the two wooden blocks are m and m, and the stiffness coefficient of the middle spring is K. the lower end of the spring is connected with m, and M is not connected with the spring. Now press m down for a certain distance to release it, and it will move harmoniously up and down. In the process of vibration, m never leaves the spring. Try to find: (1) the maximum amplitude of M vibration; (2) the maximum pressure of m on the ground when m vibrates with the maximum amplitude
- 20. Factorization of 2 (A-3) & # - a = 3