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8 tháng 4 2024

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13 tháng 4 2024

học tin đi khác biết

 

\(A=\dfrac{5n+12}{n+2}=\dfrac{5n+10+2}{n+2}=5+\dfrac{2}{n+2}\)

Để A min thì \(\dfrac{2}{n+2}\) min

=>n+2=-1

=>n=-3

Bài 7:

a: Số gạo ngày 3 bán được chiếm:

\(\dfrac{3}{7}\cdot25\%=\dfrac{3}{7}\cdot\dfrac{1}{4}=\dfrac{3}{28}\)(tổng số gạo)

Số gạo ngày 2 bán được chiếm\(1-\dfrac{3}{7}-\dfrac{3}{28}=\dfrac{28-12-3}{28}=\dfrac{13}{28}\)(tổng số gạo)

Tổng số gạo là \(26:\dfrac{13}{28}=26\cdot\dfrac{28}{13}=56\left(tấn\right)\)

b: Số gạo bán được trong ngày 1 là: \(56\cdot\dfrac{3}{7}=24\left(tấn\right)\)

Số gạo bán được trong ngày 3 là \(56\cdot\dfrac{3}{28}=6\left(tấn\right)\)

Bài 6:

a: Sau ngày 1 thì số trang còn lại chiếm:

\(1-\dfrac{1}{5}=\dfrac{4}{5}\)(quyển sách)

Sau ngày 2 thì số trang còn lại chiếm:

\(\dfrac{4}{5}\left(1-\dfrac{2}{3}\right)=\dfrac{4}{5}\cdot\dfrac{1}{3}=\dfrac{4}{15}\)(quyển sách)

Số trang của quyển sách là:

\(200:\dfrac{4}{15}=200\cdot\dfrac{15}{4}=50\cdot15=750\left(trang\right)\)

b: Số trang đọc được trong ngày 1 là:

\(750\cdot\dfrac{1}{5}=150\left(trang\right)\)

số trang đọc được trong ngày 2 la:

750-150-200=400(trang)

Số học sinh giỏi khối 6 kì 1 chiếm \(\dfrac{2}{7+2}=\dfrac{2}{9}\)(toàn khối)

Số học sinh giỏi khối 6 kì 2 chiếm \(\dfrac{3}{8+3}=\dfrac{3}{11}\)(toàn khối)

Số học sinh khối 6 là \(5:\left(\dfrac{3}{11}-\dfrac{2}{9}\right)=5:\left(\dfrac{27}{99}-\dfrac{22}{99}\right)=5:\dfrac{5}{99}=99\left(bạn\right)\)

8 tháng 4 2024

Từ xa xưa, ông cha ta đã có câu "y phục xứng kì tích”. Đúng vậy nhiều khi chỉ cần nhìn cách ăn mặc, đi đứng hay nói năng cũng có thể đánh giá được ít nhiều những tính cách của người đó. Đã là học sinh thì trang phục phải chỉnh tề, sạch sẽ, gọn gàng, phù hợp với độ tuổi, với hoàn cảnh là quan trọng hơn hết.

Trang phục có thể coi là bạn đồng hành gắn bó với chúng ta, không chỉ che chở, sưởi ấm mà còn thể hiện nhu cầu, thẩm mĩ của mỗi cá nhân. Vì vậy trước khi mặc một bộ đồng phục thì phải biết mặc thế nào cho đẹp, để trang phục luôn chỉnh tề, sạch sẽ, gọn gàng, ta nên tuân thủ quy định của nhà trường. Ta thấy nội quy trang phục của nhà trường hiện nay tương đối là đẹp, phù hợp với lứa tuổi, cụ thể là những chiếc áo sơ mi trắng, những chiếc quần sẫm màu, cũng có thể là bộ áo dài duyên dáng đối với nữ. Tuy nhiên không ít trường hợp học sinh tự ý cách điệu bộ đồng phục này thành những chiếc váy ngắn cũn cỡn, màu sắc cũng được biến đổi khá đa dạng, có nhiều bạn nam khoác lên mình những chiếc áo phông có in những hàng chữ nước ngoài, rồi những hình ảnh không lành mạnh nó làm mất hết đi vẻ ngây thơ trong sáng, gọn gàng sạch sẽ của học sinh.

Môi trường trong nhà trường là nơi cần có sự trang nghiêm và nhất thiết phải tuân thủ theo những quy định chung. Đặc biệt đối với cách ăn mặc của học sinh cũng góp phần tạo nên bộ mặt của ngôi trường đó, vì vậy mà học sinh chúng ta hãy tự làm đẹp cho mình, cũng là làm đẹp cho cộng đồng và khi đó sẽ tạo cho mọi người xung quanh một cái nhìn thiên cảm, chứ không phải là cái nhìn đua đòi biến mình thành kẻ ” khác người”. Chúng ta hãy lựa chọn cho mình những trang phục đẹp tô thêm nét đẹp tuổi học trò đảm bảo tính nghiêm túc trách được kiểu ăn mặc kệch cỡm, xóa bỏ sự ngăn cách và mặc cảm về sự giàu nghèo giữa các học sinh trong trường trong lớp. Đồng thời, cũng cần phải biết yêu quý bộ đồng phục của mình dù nó không phải trang phục đắt tiền.

Như vậy biết cách lựa chọn trang phục đẹp phù hợp với lứa tuổi, với hoàn cảnh đặc biệt là phù hợp với nhà trường cũng có nghĩa là ta thể hiện mình là người có văn hoa giữ được nét đẹp truyền thống của dân tộc. Vì vậy ngay từ bây giờ chúng ta hãy chọn cho mình những trang phục chỉnh tề gọn gàng, sạch sẽ, đồng thời loại bỏ phê phán ăn mặc đua đòi chay theo mốt.

8 tháng 4 2024

nhớ tick

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8 tháng 4 2024

Số số hạng 

(100 - 1):1 +1 = 100 số hạng

Tổng 

(100 + 1) x 100 : 2 = 5050

8 tháng 4 2024

Có số cặp là:

100 : 2 = 50

Một cặp có giá trị là:

100 + 1 = 101

Vậy, suy ra:

101 x 50 = 5050

1. We …………..go to the party. We’re going to a wedding.             A. couldn’t                  B. won’t be able to                 C. will                         D. want to be able to 2. Daisy is very …………to take the test. She is a very good student.             A. kind                        B. friendly                               C....
Đọc tiếp

1. We …………..go to the party. We’re going to a wedding.

            A. couldn’t                  B. won’t be able to                 C. will                         D. want to be able to

2. Daisy is very …………to take the test. She is a very good student.

            A. kind                        B. friendly                               C. confident                        D. talkative

       

3. Our future houses will use………………energy and they are friendly to the environment

            A. sun                          B. sunny                                  C. lunar                        D. solar

4. Of the two girls, she is ……………………...

            A. beautiful                 B. more beautiful                    C. most beautiful          D. the most beautiful

5. “Sorry, I’m late.” – “………………. we haven’t started yet” .

            A. Don’t worry           B. Thank you                          C. You’re welcome         D. Why?

6. …………….doing morning exercises is good for your health, don’t do it too hard.

            A. Despite                   B. If                                         C. Although                        D. When

7. Please collect all the recyclable materials, and take them to the ……………..factory.

            A. recycle                   B. recycling                            C. recycled                        D. recyclable

8. It is ………………to live far from the market and the supermarket.

            A. easy                                    B. comfortable                                    C. inconvenient          D. convenient

9. Most children like ……………..because they make them laugh a lot.

            A. films                       B. love stories                         C. documentary   D. comedies               

10. The weather is nice, so I enjoy doing …………………activities.

            A. outdoor                   B. insides                                C. interested                        D. bored

V. Give the correct form of the words given in capitals at the end of each sentence. (5 pts)

1. We mustn’t be ……………………………..when we across busy street.  CARE

2. Going for a walk in the early morning gives him ……………..………………  PLEASE

3. Do you think all the cars in the future will run on ……………….…………………       ELECTRIC

4. When children are eighteen, they can be …………………..………..from their parents. DEPEND

5. A trip to Fan Si Fan is an ………………………………………experience. FORGET

6. People believe that playing games for too long can be …………….………..to their children’s health. HARM

7. Today is an awful day for me. It is the ………………….………….of my life.            BAD

8. She lives in a small village and its …………….……….……..are very beautiful. SURROUND

9. Kate has got a great ………………………….…… You will really like her.      PERSON

10. I think the most useful and convenient of all ……………………… appliances is the microwave oven.  HOUSE    

VI. Give the correct form of each verb in the gap to complete the following sentences.(6 pts)

1-2. I (not hear) anything about him since he (move) to his new house in Ho Chi Minh city.

      => ………………….………………/ …………………………..……………………………………

3. Do you have any plans for Saturday? - I (help) some friends move to their new house.

      => ………………….……………………………………….….…………………..…………………

4-5. Mrs. Ann often (leave) her house for work very early when she (live) in the countryside?

      => …………………………………………/ .………………………………………..…....................

6. Don’t make noise anymore! I (learn) for the exam tomorrow.    

  => ………………………………………………………….…………………………………………..

7. Which type of house would you like (live) in the future? - Well, maybe a hi-tech house on the ocean.

     => ………………………………………………………….…………………………………………..

8. All the members of my family enjoy (cycle) in the early morning to breathe fresh air.

   => ………………………………………………………….…………………………………………..

9. Will robots be able (recognise) our voice?             

  => ………………………………………………………….…………………………………………..

10. If nobody (help) you, you have to do it yourself.

  => ………………………………………………………….…………………………………………..

11. The clouds are leaving, and the Sun is coming out. It probably (not rain) anymore.

  => ………………………………………………………….…………………………………………..

12. How long is it since he (take) part in the environmental programme?    

  => ………………………………………………………….…………………………………………..

VII. There is one mistake in each sentence, underline then correct it. (5 pts)

1. My future house will be surrounding by tall trees and blue sea.

 => ..………………….…...........................................................................................................................

2. His team promises that they should win the match next summer.

 => ..………………….…...........................................................................................................................

3. New York is an excited city with many skyscrapers.

=> ..………………….…...........................................................................................................................

4. If we breathe pollute air, we will have breathing problems.

=> ..………………….…...........................................................................................................................

5. There are so many people in the street that the police can’t do nothing.

 => ..………………….…..........................................................................................................................

VIII. Complete the sentences with one suitable preposition. (5 pts) 

1. The rooms in the Crazy House hotel are named ………………………….different animals.

2. This evening, we are working …………………….our school project.

3. Da Lat is very famous ………………………its pretty roses and beautiful landscapes.

4. I like watching football matches, but I am not very good ………..…….playing football.

5. The robot will help me order food ………………….……the supermarket.

6. Tomorrow, we’re cycling ………………………….to discover the city.

7. Well, outside the sun is shining so I’m ………..…….to get some fresh air.

8. We will have a class meeting …………………....…the end of May.

9. The air in this area is polluted ……………………………..smoke from factories.

10. There are many modern buildings and offices, so the streets are busy and crowded ……………..….. the day.

IX. Rearrange the following sentences to make meaningful dialogue. (5pts)
A. At 9 o’clock Saturday morning or 10 o’clock Sunday evening.

B. Thank you. I’ll watch it.

C. No. What is it?

D. Really? I’ve never seen it. What country is it on?

E.  Well…When is it on?

F. Discovery channel.

G. Australia, America…It’s an attraction at many country fairs.

H. That sounds interesting. Which channel is it on?

I.  Hey Phong, did you watch the pig race on TV yesterday?

K. It’s a sport. Pigs race around a small track. It’s really very funny.

* Your answer:

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

X. Fill in each blank with ONE suitable word. (10 pts)

     Some people think that sports and games are unimportant things. In fact, sports and games can (1)……… of great value, especially to people working with their brain most (2)……………….. the day.

     Sports and games (3)………………our bodies strong and keep us healthy. But these are not their only uses. They give us valuable (4)………………….in making eyes, brain, and muscles work together. For (5)…………………., in tennis, our eyes see the ball coming, judge its speed and direction, and pass this information on to the brain. The brain then has to decide (6)…………..…… to do, and send its orders to muscle of the arms, legs, and so on. So tennis (7)………..…………train the co-ordination among eyes, brain, arms, and legs.

     Sports and games are also (8)…………..….. for character training. In their (9)…………… at school, boys and girls may learn about such virtues as unselfishness, courage, discipline, and (10)…….………..

of one’s country. In sports and games a pupil can really practice these virtues.

XI. Fill in each gap with a suitable word in the box to complete the following passage.( 5 pts)

results             

complaining                  

think                   

negative              

like             

spend  

recent             

according  

shown 

watches

well    

usual     

  British parents are always (1)………………..that their children spend too much time watching TV and not enough time doing other activities (2)…………..sports and reading. A (3)………….. survey of people’s free time activities shows that young people (4)……………..about 23 hours a week in front of the television set, which means over 3 hours a day.

Surprisingly, the average adult (5)…………..……. even more: 28 hours a week. Every household in the country has a television set and over half have two or more. (6)………...………to the survey people do not only watch sitting in their living room, they watch it in the kitchen and in bed as (7)………... .

We cannot deny that television also has some (8)…………………..effects especially on children, because many films (9)…………………..on TV contain violence, crime and other bad things. Excessive

watching of  TV by children has lowered their (10)………………….in studying at school.

XII. Read the following passage and circle the best answer. (5 pts)

            In the United States, many adults and children (1)…………..overweight. Some people eat (2)………………food at meals. They also eat snacks between meals. Sometimes people eat healthy snacks like fruit or vegetables (3)……………..many Americans eat a lot of junk food such as cookies, candy and potato chips. Eating junk food can (4)……………..people gain weight. People also gain weight (5)………………….they don’t get enough (6)……………… . People need to walk, run, ride bicycles, or walk out in (7)……………. clubs and gyms. When people exercise, they (8)………..good and have more energy. A good diet and exercise will help you (9)……………a long and (10)………………..life.

1. A. is                                     B. was                                     C. were                                    D. are

2. A. too many                        B. too much                            C. few                                     D. plenty

3. A. but                                  B. because                               C. although                                    D. so that

4. A. get                                  B. lead                                     C. urge                                     D. make

5. A. so                                    B. however                              C. because                                     D. but             

6. A. exercises                        B. work                                   C. money                                    D. energy

7. A. healthy                           B. health                                 C. unhealthy                                    D. physical

8. A. get                                  B. taste                                                C. have                            D. feel

9. A. live                                 B. lives                                    C. living                                    D. to living

10. A. health                           B. healthy                                C. safe                                     D. fair             

XIII. Rewrite each of the following sentence in such a way that it means exactly the same. (10 pts)

1. That film is interesting to me.

   => I………………………………………………………………………………………………………

2. He failed the exam because of his laziness.

   => Because he…………………………………………………………………………………………..

3. My sister will be eighteen next week.

    => It …………………………………………………………………………………………….……..

4. Keeping the environment clean is very important.

    => It……………………………………………………………………………………………….…..

5. It took me ten days to finish the project about the festivals in Viet Nam.

    => I spent………………………………………………………………………………………….……

6.  We’ve never eaten fish and chips before.

    => It’s..…….. …………………………………………………………………………………………

7. It’s not necessary for you to finish your assignment this evening.

=> You don’t…….……………………………………………………………………………….……

8. Nobody plays this piece of music as beautifully as they do.

=> They………………… …………………………………..................................................…..........

9. The garden party won’t take place if the weather doesn’t improve.

=> Unless……………………………………………………………………………………..…..…...

10. It’s a good idea to eat a lot of fruit and vegetables every day.

=> You had…………………………………………………………………………………….….......

XIV. Use the suggested words to write meaningful sentences. (5 pts)

1. Life / countryside / slow / peaceful / than / city.

=> …………………………………………………………………………………………………………

2. Some / year / ago / robots / cannot / move / easy / but they / able / walk / now.

=> …………………………………………………………………………………………………….......

3. What / kind / TV programme / you / like / watch / most / when / you / be / small?

=> …………………………………………………………………………………………………….…..

4. I / cannot / go / picnic / classmates / this Sunday / because / I / visit / grandparents.

=> ………………………………………………………………………………………………………...

5. If / there / floods / many part/ world / many people / lose / homes.

=> ………………………………………………………………………………………..……………….

XV. Write a paragraph (80 - 100 words) to give ideas to make your school “green”. (10 pts)

.......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................................................................................................................................................................................................. ............................................................................................................................................................................................................................................................................................................

1 de kho

 

10
9 tháng 4 2024

1. We …………..go to the party. We’re going to a wedding.

            A. couldn’t                  B. won’t be able to                 C. will                         D. want to be able to

2. Daisy is very …………to take the test. She is a very good student.

            A. kind                        B. friendly                               C. confident                        D. talkative

    

3. Our future houses will use………………energy and they are friendly to the environment

            A. sun                          B. sunny                                  C. lunar                        D. solar

4. Of the two girls, she is ……………………...

            A. beautiful                 B. more beautiful                    C. most beautiful          D. the most beautiful

5. “Sorry, I’m late.” – “………………. we haven’t started yet” .

            A. Don’t worry           B. Thank you                          C. You’re welcome         D. Why?

6. …………….doing morning exercises is good for your health, don’t do it too hard.

            A. Despite                   B. If                                         C. Although                        D. When

7. Please collect all the recyclable materials, and take them to the ……………..factory.

            A. recycle                   B. recycling                            C. recycled                        D. recyclable

8. It is ………………to live far from the market and the supermarket.

            A. easy                                    B. comfortable                                    C. inconvenient          D. convenient

9. Most children like ……………..because they make them laugh a lot.

            A. films                       B. love stories                         C. documentary   D. comedies               

10. The weather is nice, so I enjoy doing …………………activities.

            A. outdoor                   B. insides                                C. interested                        D. bored

9 tháng 4 2024

V. Give the correct form of the words given in capitals at the end of each sentence. (5 pts)

1. We mustn’t be …………careless…………………..when we across busy street.  CARE

2. Going for a walk in the early morning gives him …………pleasure…..………………  PLEASE

3. Do you think all the cars in the future will run on …………electricity…….…………………       ELECTRIC

4. When children are eighteen, they can be ……………independent……..………..from their parents. DEPEND

5. A trip to Fan Si Fan is an ………………………unforgetable ………………experience. FORGET

6. People believe that playing games for too long can be …………….harmful………..to their children’s health. HARM

7. Today is an awful day for me. It is the ……………worst…….………….of my life.            BAD

8. She lives in a small village and its …………….surroundings……….……..are very beautiful. SURROUND

9. Kate has got a great ………………………personality….…… You will really like her.      PERSON

10. I think the most useful and convenient of all …………household…………… appliances is the microwave oven.  HOUSE    

8 tháng 4 2024

lên gg nha

8 tháng 4 2024

oki

Sửa đề: \(H=\left(1+\dfrac{1}{1\cdot3}\right)\left(1+\dfrac{1}{2\cdot4}\right)\cdot...\cdot\left(1+\dfrac{1}{99\cdot101}\right)\)

\(=\left(1+\dfrac{1}{2^2-1}\right)\left(1+\dfrac{1}{3^2-1}\right)\cdot...\cdot\left(1+\dfrac{1}{100^2-1}\right)\)

\(=\dfrac{2^2}{2^2-1}\cdot\dfrac{3^2}{3^2-1}\cdot...\cdot\dfrac{100^2}{100^2-1}\)

\(=\dfrac{2\cdot3\cdot...\cdot100}{1\cdot2\cdot3\cdot...\cdot99}\cdot\dfrac{2\cdot3\cdot...\cdot100}{3\cdot4\cdot...\cdot101}\)

\(=\dfrac{100}{1}\cdot\dfrac{2}{101}=\dfrac{200}{101}\)

8 tháng 4 2024

khó quá