Dùng ròng rọc sẽ 2 lần về đương đi nên

\(h=\dfrac{s}{2}=\dfrac{8}{2}=4m\)

Công nâng là

\(A=P,h=420.4=1680\left(J\right)\)

Công nâng vật là:  

ày bạn lấy ở đâu vậy

à . mik mới học lớp5 hoi nên ko giải đc câu này

How often do you learn English?

=> I have it four times a week.

2. When did you start learning English?

=> I have learnt it for 5 years.

3. What is your favourite subject?

I love Biology.

4. Why do you Biology?

Because it's very insteresting subject.

5. Do you Maths?

No, I don't.

Học tốt~♤

Trước tiên, để hỏi những thông tin cơ bản nhất về chủ đề học tập là trường, lớp một ai đó đang theo học, bạn có thể sử dụng các mẫu câu sau:

/ wʌt skul ɑr ju ɪn /

/ wɪʧ skul ɑr ju ɪn /

/ wʌt skul du ju əˈtɛnd /

/ wʌt skul du ju goʊ tu /

Các câu hỏi trên đều có chung nghĩa: Bạn đang học ở trường nào?/Đâu là ngôi trường bạn đang theo học?. Như bạn thấy, bạn có thể sử dụng cụm “What school” hoặc “Which school” để hỏi, và có thể dùng một trong các cụm “are you in”, động từ “go to” hoặc “attend” để diễn đạt ý nghĩa đang theo học, đang học tại một ngôi trường nào đó.

Tuy nhiên, cũng có một sự khác biệt nhỏ giữa trường hợp sử dụng “What” và “Which”. “Which” thường được dùng khi bạn có một danh sách, hoặc một tập hợp đối tượng để người được hỏi có thể lựa chọn từ danh sách, tập hợp đó. Ví dụ, các bạn đang nói chuyện về một nhóm các ngôi trường ở cùng một thành phố A. Khi bạn hỏi một người bạn: “Which school do you go to?”, nghĩa là bạn ấy sẽ cho bạn biết mình đang theo học trường nào trong số các ngôi trường nằm ở thành phố A kia.

Thay vào đó, “What” sẽ được sử dụng khi đối tượng các bạn đang nói đến mang tính khái quát, phạm vi rộng hơn, có thể là bất cứ trường nào chứ không bó hẹp trong một danh sách, tập hợp cụ thể nào cả. Cách hỏi này cũng sẽ mang tính chung hơn. Khi hỏi một người “What school are you in?”, có thể bạn ấy sẽ không nói tên cụ thể của ngôi trường mình học mà chỉ mô tả chung đó là business school (trường dạy kinh doanh), medical school (trường y), v.v.

Ngoài ra, có một lưu ý nhỏ khác về sự khác nhau giữa tiếng Anh – Anh và Anh – Mỹ về nghĩa của từ “school”. Trong tiếng Anh – Mỹ, “school” có ý chỉ tất cả các cấp học, từ mẫu giáo, trung học đến cao đẳng, đại học. Nhưng trong tiếng Anh – Anh, “school” chỉ bao hàm cấp học tiểu học, trung học chứ không bao gồm giáo dục cao đẳng, đại học. Cao đẳng, đại học sẽ được chỉ rõ là “college” và “university”. Do đó, tùy vào tình huống, ngữ cảnh và loại ngôn ngữ sử dụng, bạn hãy sử dụng đúng từ nhé.

Bên cạnh việc hỏi tên trường, bạn có thể hỏi thêm những thông tin, cảm nhận khác liên quan đến trường, lớp của đối phương, ví dụ như:

/ duː juː θɪŋk jɔː ˈkɒlɪʤ ɪz ə gʊd skuːl /

/ dɪd ju ɛnˈʤɔɪ ˈgoʊɪŋ tu haɪ skul /

/ haʊ ˈmɛni ˈstudənts dʌz jʊər skul hæv /

/ wʌt du ju rɪˈmɛmbər əˈbaʊt jʊər ˈtiʧərz /

/ hu ɪz jʊər ˈfeɪvərɪt ˈtiʧər /

/ du ju hæv ˈɛni ˈtiʧərz ju doʊnt laɪk /

Khi nói chuyện, hỏi thông tin một sinh viên cao đẳng, đại học (hoặc người đã tốt nghiệp), ta thường quan tâm đến “major” – chuyên ngành học của họ. Các chuyên ngành khác nhau có chương trình học, tính chất rất khác nhau, đào tạo chuyên môn khác nhau và dẫn đến những nghề nghiệp khác nhau. Bạn có thể sử dụng các mẫu câu sau để hỏi về chuyên ngành học của bạn mình nhé:

/ wʌt du ju ˈstʌdi /

/ wʌt ɪz jʊər ˈmeɪʤər /

/ wʌt ɑr ju ˈmeɪʤərɪŋ ɪn /

/ wʌt dɪd ju ˈmeɪʤər ɪn æt ˌjunəˈvɜrsəti /

/ waɪ dɪd ju ʧuz ðə ˈmeɪʤər ju dɪd /

Đi vào chi tiết, cụ thể hơn, ta có thể đi vào các môn học – “subject”, “class”. Có một số chủ đề các bạn có thể chia sẻ cùng nhau: những môn phải học, môn sở trường, sở đoản, môn học ưa thích, v.v. Dưới đây mình có đưa ra một số các mẫu câu thường gặp mà bạn có thể tham khảo:

/ wʌt ˈsʌbʤɪkts ɑr ju gʊd æt /

/ wʌt ˈsʌbʤɪkts wɜr ju bæd æt /

/ wʌt ɪz jʊər ˈfeɪvərɪt klæs /

/ wʌt ɪz jʊər ˈfeɪvərɪt ˈsʌbʤɪkt /

/ waɪ du ju laɪk ɪt /

/ du ju ˈstʌdi ˈɛni ˈfɔrən ˈlæŋgwəʤ ɪn skul /

/ wʌt ˈklæsəz du ju nid tu teɪk /

Nếu như những thông tin về trường học, chuyên ngành, môn học là những thông tin khá “basic”, “mẫu mực”, thì thói quen, cuộc sống, phương pháp học tập là chủ đề rất mở, không có giới hạn, và đây thường là chủ đề mà các bạn có thể “huyên thuyên” cùng nhau hoài không dứt. Có đến cả tỉ thứ bạn có thể chia sẻ cùng mọi người: giờ giấc đi học, trang phục mỗi ngày, đến trường bằng xe hai bánh hay “hai cẳng”, trải nghiệm những lần “bùng” học, ăn quà trong lớp, ôn thi…, và thường những câu chuyện nhỏ này sẽ giúp các bạn quen, thân nhau nhanh hơn rất nhiều đó!

Trong trường hợp vẫn chưa nghĩ ra chuyện gì để hỏi, bạn hãy thử những câu hỏi này xem:

/ du ju pɑrˈtɪsəˌpeɪt ɪn ˈɛni ˌɛkstrəkəˈrɪkjələr ækˈtɪvətiz æt ˌjunəˈvɜrsəti /

/ du ju fil ðæt ɪt ɪz ˈhɑrdər tu ˈstʌdi æt ˌjunəˈvɜrsəti ðæn ɪn haɪ skul /

/ du ju laɪk tu ˈstʌdi ɪn smɔl ˈklæsəz ɔr bɪg ˈklæsəz /

/ ɑr ju ˈlɪvɪŋ ɪn ðə ˌjunəˈvɜrsətiz ˈdɔrməˌtɔri /

/ haʊ ɪz jʊər laɪf ɪn ðə ˈdɔrməˌtɔri /

/ hæv ju ˈɛvər steɪd ʌp ɔl naɪt fɔr ˈfaɪnəlz /

/ du ju prəˈfɜr ˈstʌdi wɪð ˈʌðər ˈstudənts ɔr ˈstʌdi əˈloʊn /

/ hæv ju ˈɛvər skɪpt klæs /

/ du ju ˈjuʒəwəli wɔk tu skul /

/ wʌt kaɪnd ʌv kloʊðz du ju ˈɔfən wɛr tu skul /

/ hæv ju ˈɛvər kənˈsɪdərd ˈstʌdiɪŋ əˈbrɔd /

1. What school do you go to?

2. How many students does your school have?

3. Who is your favourite school?

4. What is your major?

5. Do you study any foreign language in school?

When I complete a journey, I would always try recalling the wonderful moments and note it down so that next time I could make it even merrier.Of the entire journey that I have done, I thoroughly enjoyed the journey that I made through the FlightLast vacation, my family decided we would make a Middle East trip for about 5-7 days and return and so the preparations for the same was being carried on. We had our relatives and friends down there who had been inviting us for some time and this time we decided we would make it.We booked our kets and on the scheduled day we started our journey. We reached the airport on time and the formalities for boarding the flight were all very smooth. We boarded the flight and made ourselves comfortable.I had my little sister too and she was all excited and happy to be on a plane. After the announcements for the take off were made, we fastened our seat belts and the flight slowly started to move.During the take off time, my sister and I were a bit scared, but once the flight was back in balance, we were relieved. I was at the window seat and so I enjoyed the sight that I saw outside. It was so beautiful.The buildings all small and nice greenery from above. After some time, we were served food. My mother helped us have the food and we enjoyed the food. We made friends in the plane and had some nice time chatting with them.I played games and watched my favourite cartoon shows. After some time I slept and took rest for some time. By the time I woke up, it was almost time to reach. I saw the oceans below us and when were nearing lands, it was a beautiful site. I enjoyed watching all this beautiful scenery from my window and finally, we landed at our destination. Though the journey came to an end, it was all very nice and I d it very much.

CHÚC BẠN HỌC TỐT NHA>.<

An essential problem of the 21st century is world pollution. Currently the environment is so contaminated that urgent measures should be taken. A single individual cannot be blamed for the world pollution, however every person should take care of his or her habitat. In addition, it is vital that environmental issues are treated internationally.

Lately, many presentations, conferences and international summits are held to deal with waste treatment, recycling, and soil and water contamination. For sure joint efforts and consolidation can only help in the mutual war towards the ongoing environmental disaster. For instance, governments should offer support to companies and organizations, involved in manufacturing, industry or agriculture in order to find environment-friendly approaches. These could be special law regulations, recycling programs, helping courses in order to implement ISO certificates and many more.

However, the influence of individuals over environment should not be ignored. If we do not confess that our planet is our home, we will never be able to take adequately care of it. We have to contribute every day to the preservation of nature and environment. For example, always remember to save energy by switching off lamps, computers and everything that we do not use. Our next obligation is to separate waste and throw bulk only in the designated areas. Driving vehicles can also be environment friendly. For example, we have to avoid accelerating the engines too rapidly or using the air conditioning in the country, where it would be better to save energy and simply open the windows.

To sum up, environmental problems should be handled by local and international authorities as well as individuals. Every single person should take care of the environment, moreover we have to bring up our children to be conscious citizens of a clean and preserved planet.

Life is increasingly enhanced by the technology works, scientific - increasingly advanced technology to serve human life. But along with this development is the future consequences that the people we have to suffer because of lack of awareness about environmental protection. Environment is what surrounds us, from the same identical green lawns, winding rivers forever or the mountains on the horizon, they all live in a world that is around us. But the fact is that, man is the murderer took away his own life by making the environment more severely polluted, especially in big cities and industrial centers. Every school day die due to the lack of a sense of protection of natural resources, deforestation, indiscriminate green lung puncture of the World or the litter, waste, toxic gases from factories now out of the canal, and the atmosphere is one thing we are alarming. Environmental pollution has become a hot issue of humanity. Summit to be held in Brazil in 1992 made the whole world call to work together to protect the earth - our planet, building the green environment - clean - beautiful. Vietnam we have enacted policies that protect natural resources and is willing to work with countries around the world to protect the environment. Students we must also be aware of environmental hygiene, actively participating in movement activities like "Green Sunday" total hygiene schools, neighborhoods, join afforestation, no discharge litter public places ... in short, environmental protection is to protect our lives

Environment is an essential part of our life. A clean environment is necessary for a peaceful and healthy life. An environment is the natural surroundings which helps human beings, animals and other living things to grow and develop naturally. But nowadays, our environment is disturbing in many different ways. Any type of disturbance in the nature’s balance affects the environment totally. It does not only ruin human lives but also affects on all living beings. We can save our environment with the little step taken by everyone on the earth. We should reduce the amount of waste, throwing wastes properly to its place only…and many other simple ways. It is very important to save environment for human existence. When we protect the environment, we are protecting ourselves and our future as well.

- Những danh từ chỉ người là : giặc và anh.

- Những danh từ chỉ con vật là : bò rừng và gà .

- Những danh từ chỉ cây cối là : cỏ .

- Những danh từ chỉ vật là : đất đai , ruộng vườn và nhà cửa .
Đây nha:>

huhu cứu em vs ạ 

em cảm ơn chị Hà Phương ạ 

lên gg dịch

đúng đúng

 My family have 4 people. There are my mother,my father,my elder sister and me.My parents are both the same age, 50 years old.My father is a teacher ,he is very kind and hard-working. My morther is a nurse, she is interesting, I think she is the most funny person in my family. My elder sister is 18 years old, she is a student and she is very pretty,she not only learns well but also plays the piano very well, I think she will become a pianist in the future. And me, I’m 16 years old and I’m a pupil, in the future i'll be a marketing staff. I love my familly very much.For me, family always is the assured a reliable support.

Hello every body ! My name is Duy . I am 14 years old . There are 5  people in my family : My father ; my mother ; my older sisters and me . My father is a doctor . He works a hospital in the city center . Every day , he go to work by bus . My mother is a teacher . She learns English at a school near my house . She walks to school every day . I have 2 elder sister . The oldest is a secretary in a company . The younger is a studente . She is learning at Hanoi university . I love my family so much . I feel very happy to be alive in this family.

                                                   My Family :

 As you know , all of us have a faimly.The family is the place we are brought up and look after everyday. Today , I would like to introduce my topic is " My Family"

 I come from a family of 4 people : my parents , my younger brother and me.

 My father is an engineer. He likes reading new spaper and watching TV.He teaches me many helpfull things in the life : know how to love everyone , how to behave well , how to keep clothes and schoolthings clean and tidy , ect .....But sometimes when I make mistakes , he is very strict but frankly my father is so kind and friendly.

 And my mother is a teacher.She is a good woman. She is very carefull.My mother cooks very well.My brother and I like eatiing her dishes very much especially fried chicken , and so on... My parents love me and my younger brother so much but they don't say.

 And my brother is a good student at Nguyen Ngoc Binh Primary School.He is a active boy in many activities as well as studying. When my brother and I have free time, we often play many many sports and games such as : badminton , volleyball , hide - and - seek , ect....

 And my name is Nhi. I'm a student at class 6/1 at Tran Phu Secondary School. I'm very good at English.

 When all the members in my family have free time , we usually talk about studying as well as working together.Also , I can have meats with my family.I'm so happy and really fun so much. At the weekend , we visit many places such as : park , zoo , beach , ....  I love all the people in my family.

 So being a member of my family , I will try my best to study well to become a good daughter . And my parents will be proud about me.