K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Các câu hỏi dưới đây có thể giống với câu hỏi trên
21 tháng 6 2019
4. Call that polynomial P (x) = ax3 + bx2 + cx + d
We have P(1)=a+b+c+d=3 (1)
P(2)=8a+4b+2c+d=3 (2)
P(3)=27a+9b+3c+d =7 (3)
P(4)=64a+16b+4c+d =21 (4)
From (1) and (2) => 7a+3b+c=0
From (1) and (4) => 63a+15b+3c=18
=> 12b+6c=-18 => 2b+c=-3
From (1) and (3) =>26a+8b+2c=4=> 13a+4b+c=2
=> 13a+2b=5
It is possible
21 tháng 6 2019
1. Tiffany và Ryan gửi một số tiền vào tài khoản ngân hàng chung sao cho tổng số dư còn lại 500. Nếu số tiền được gửi bởi Tiffany và Ryan được vẽ dưới dạng biểu đồ tuyến tính trên mặt phẳng xy, hãy tìm khu vực giữa biểu đồ này và trục tọa độ.
2.Một nhóm công nhân đang mở đường. Nếu họ mở 200m đường mỗi ngày, họ sẽ cần thêm 3 ngày nữa. để hoàn thành công việc. Nếu họ mở 240m đường mỗi ngày, họ sẽ hoàn thành công việc trước 2 ngày. Bao lâu là đường, tính bằng mét?
3. Bà Darlie có một chiếc nhẫn bạc, một chiếc nhẫn vàng và một chiếc nhẫn kim cương. Cô đặt chúng lên tay trái. Mỗi chiếc nhẫn có thể nằm trên bất kỳ ngón tay nào trong năm ngón tay. Khi có hai hoặc ba chiếc nhẫn trên cùng một ngón tay, nếu thứ tự chúng được đặt khác nhau, thì đó là một cách khác nhau. Có bao nhiêu cách khác nhau để Lea đặt những chiếc nhẫn này?
4. Đặt P (x) là một đa thức có bậc 3 sao cho P (1) = 3, P (2) = 3, P (3) = 7, P (4) = 21. Tìm giá trị của P (5).
DV
18 tháng 12 2016
10 divided by 9, quotient 1 remainder 1
20 divided by 9, quotient 2 remainder 2
30 divided by 9, quotient 3 remainder 3
...
90 divided by 9, quotient 9 remainder 9
there are 9 numbers
HK
15 tháng 6 2016
Minh moi hoc lop 5 thoi. Hong biet co dung ko . Minh doan la 360 do. Sai thi thoi nhe
2 tháng 10 2019
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 55 to 64.
Overpopulation, the situation of having large numbers of people with too few resources and too little space, is closely associated with poverty. It can result from high population density, or from low amounts of resources, or from both. Excessively high population densities put stress on available resources. Only a certainnumber of people can be supported on a given area of land, and that number depends on how much food and other resources the land can provide. In countries where people live primarily by means of simple farming, gardening, herding, hunting, and gathering, even large areas of land can support only small numbers of people because these labor-intensive subsistence activities produce only small amounts of food.
In developed countries such as the United States, Japan, and the countries of Western Europe, overpopulation generally is not considered a major cause of poverty. These countries produce large quantities of food through mechanized farming, which depends on commercial fertilizers, large-scale irrigation, and agricultural machinery. This form of production provides enough food to support the high densities of people in metropolitan areas.
A country’s level of poverty can depend greatly on its mix of population density and agricultural productivity. Bangladesh, for example, has one of the world’s highest population densities, with 1,147 persons per sq km. A large majority of the people of Bangladesh engage in low-productivity manual farming, which contributes to the country’s extremely high level of poverty. Some of the smaller countries in Western Europe, such as the Netherlands and Belgium, have high population densities as well. These countries practice mechanized farming and are involved in high-tech industries, however, and therefore have high standards of living.
At the other end of the spectrum, many countries in sub-Saharan Africa have population densities of less than 30 persons per sq km. Many people in these countries practice manual subsistence farming; these countries also have infertileland, and lack the economic resources and technology to boost productivity. As a consequence, these nations are very poor. The United States has both relatively low population density and high agricultural productivity; it is one of the world’s wealthiest nations.
High birth rates contribute to overpopulation in many developing countries. Children are assets to many poor families because they provide labor, usually for farming. Cultural norms in traditionally rural societies commonly sanction the value of large families. Also, the governments of developing countries often provide
little or no support, financial or political, for family planning; even people who wish to keep their families small have difficulty doing so. For all these reasons, developing countries tend to have high rates of population growth.
From "Poverty" by Thomas J. Corbett
Which of the following is given a definition in paragraph 1?
- A. Poverty
- B. Population density
- C. Overpopulation
- D. Simple farming
-
Câu 2:
What will suffer when there are excessively high population densities?
- A. Available resources
- B. Farming methods
- C. Land area
- D. Skilled labor
-
Câu 3:
The phrase “that number” in paragraph 1 refers to the number of ______.
- A. resources
- B. countries
- C. people
- D. densities
-
Câu 4:
In certain countries, large areas of land can only yield small amounts of food because ______.
- A. there is an abundance of resources
- B. there is no shortage of skilled labor
- C. there are small numbers of laborers
- D. there is lack of mechanization
-
Câu 5:
Bangladesh is a country where the level of poverty depends greatly on ______.
- A. population density in metropolitan areas
- B. both population density and agricultural productivity
- C. its population density only
- D. its high agricultural productivity
-
Câu 6:
The phrase “engage in” in paragraph 3 is closest in meaning to ______.
- A. escape from
- B. look into
- C. give up
- D. participate in
-
Câu 7:
The word “ infertile ” in paragraph 4 probably means ______.
- A. impossible
- B. unproductive
- C. disused
- D. inaccessible
-
Câu 8:
Which of the following is TRUE, according to the passage?
- A. In sub-Saharan African countries, productivity is boosted by technology.
- B. There is no connection between a country’s culture and overpopulation.
- C. All small countries in Western Europe have high population densities.
- D. In certain developed countries, mechanized farming is applied.
-
Câu 9:
Which of the following is a contributor to overpopulation in many developing countries?
- A. High-tech facilities
- B. High birth rates
- C. Economic resources
- D. Sufficient financial support
-
Câu 10:
Which of the following could be the best title for the passage?
- A. High Birth Rate and its Consequences
- B. Poverty in Developing Countries
- C. Overpopulation: A Worldwide Problem
- D. Overpopulation: A Cause of Poverty
B
9 tháng 2 2023
1. The schoolboys were _____excited______ to go to the match between their school and the nearby one. (excite)
2. Many workers are _____disppointed______ to receive the pay when they start the first job.(disappoint)
3. To tell the truth, I was ___amused______ to read the funny stories written by my classmate.(amuse)
4. All of us got ___shocked_____ to hear of the accident happening to our close friend, Henry. (shock)
5. Nowadays no one is _____free_____ to do what he wants if it does harm to the community. (freedom)
6. My pet dog is _____cased?_____ to please, so I can give it anything edible. (case)
7. The _____farmers____ in the village are is->are sad to hear that there will be no rain in the next two weeks. (farm)
8. Green Peace is an ___organization_____ keen to protect the environment (organize)
9. The scientist is sure to find something _____useful_____ from his experiment.(use)
11. Mike failed his physics final ____exam____ and had to sit it again. (examine)
12. Their teachers used to punish them by ____making_____ them stay behind after school. (make)
13. Everyone agrees that a good _____education______ is important. (educate)
14. This book has a very ____interesting______ introduction. (interest)
15. We find listening ___comprehension_____ tests rather difficult. (comprehend)
16. Ben went on to be a very ____successful______ student at university. (success)
17. You should pay more ____attention______ in class if you want to make progress. (attend)
18. Before you begin the exam paper, please read the instructions ____carefully____ (care)
19. In our country, children start ____secondary______ school at 12 years old.(second)
20. Ben missed the test because of his ___absence_____last Monday. (absent)
21. You must be ___careful_______ when you open that door. (care)
22. We'll live a happier and _____healthier_____ life if we keep our environment clean.(health)
23. You are talking complete _____sensibly______ (sense)
25. Some ____environmental______ groups have declared a boycott of tourism on the island. (environment)
26. Air _____pollution_______ can cause illness and even death. (pollute)
27. We're very _______excited___ about our holiday. (excite)
28. Jackson canceled the concert to the great ______disappointment___ (disappoint)
29. Customers made a formal ____complaint_____ treated (complain)
30. She declined his invitation because of the ____impoliteness_____ of his fans (polite)
31. That old man told me an ____amazing_____ story (amaze)
32. Gasoline fumes ____pollute(tham khảo c32)____ the city air (pollution)
33. I think the careless drivers should be fined ____heavily____ (heavy)
34. Many people are concerned about the pollution of the ____environment_____ (environmental)
35. The seaside has a ____healthy_____ climate (health)
There are five.
(Free!)
there are five fingers in my hand