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20 tháng 12 2019

a)n.(n+1)/2

26 tháng 5 2017

I want to introduce a modern music that has been of great interest to people in recent years. K-pop (Korean for "Korean pop", Hangul: 케이팝, also known as "Kayo" or "Gayo") is a genre of music originating in Korea characterized by many audiovisual elements . Many artists and groups have come from Korea and have become popular in many countries around the world. The popularity of K-pop is often considered to be part of the rise of the Korean Wave (Hallyu, 한류), the rise of the popularity of contemporary Korean culture in Asia. It belongs to the Korean nation. Hip-hop music • R & B • dance pop • Bubblegum pop • House • Electropop • rock and roll • dance-pop • EDM • hip hop • other genres Musical Instruments Singing • Rap • Guitar • Bass guitar • Drum kit • Synthesizer • Piano • Auto • Rotary table • Sampler • Keyboard • Drum machine. Originating from the culture of the 1990s to the end of the year in Korea. Has influenced Korea, Japan, China, Taiwan, Southeast Asia and India since the 2000s. Kpop does not stop there but it is also a big wave for the global population. Especially with young people today. It can be said that kpop is not only prominent in music but also has a high level of modern dance moves. Kpop will have a breakthrough in the future .

13 tháng 8 2018

1.

An important person who has influenced in my life in most positive way is my mother. Nothing in the world can compare with the true love and the care of my mother. She is not only my mother but also my friend and my great teacher. She taught me how to be brave, honest and kind to everyone. She also showed me how to give and take. Although she is very busy, she always spares her time for her family. She is always the first one to get up and prepare breakfast for us. She is the first person has to come up my mind and always helps me whenever I have to cope with difficulties. In conclusion, in my heart always consider my mom as the most perfect woman in the world and I do want to say ''I love you, mom. I can not live without you!''

Nguồn: Internet
21 tháng 1 2021

 1.        Hoàn thành những câu sau với dạng đúng của động từ cho sẵn với thì Tương lai đơn và Hiện tại đơn

 

water            grow               help                    take                       read

 

It's wonderful to have a hobby to do for pleasure in your free time. My favourite hobby is gardening. I love watching flowers and eating vegetables, so I (1) ………grow……….  a lot of plants in my garden. I usually (2) …………water…….  them in the early mornings. Sometimes my mother also (3) ………helps……….  me care them and my father (4)……takes………….  me to the market to buy seeds. I often (5) ……read………….  books to understand more about gardening.

21 tháng 1 2021

   1.        Hoàn thành những câu sau với dạng đúng của động từ cho sẵn với thì Tương lai đơn và Hiện tại đơn

 

water            grow               help                    take                       read

 

It's wonderful to have a hobby to do for pleasure in your free time. My favourite hobby is gardening. I love watching flowers and eating vegetables, so I (1) …………gfrow…….  a lot of plants in my garden. I usually (2) ………water……….  them in the early mornings. Sometimes my mother also (3) …………helps…….  me care them and my father (4)………takes……….  me to the market to buy seeds. I often (5) …………read…….  books to understand more about gardening.

Câu 6. Hợp chất khí A có phân tử gồm 1 nguyên tử R liên kết vớ 2 nguyên tử oxi (O) và nặng hơn khí nitơ (N2) 1,571 lần. 1) Tính nguyên tử khối của R? Cho biết tên R? 2) Viết công thức hóa học của hợp chất khí A? Biết: C = 12, O =16, H = 1, S = 32, Na = 23, Mg = 24, P = 31, K = 39 Câu 7. Đốt cháy hết 9 gam kim loại magie Mg trong không khí thu được 15 gam magie oxit. Biết rằng, magie cháy là xảy ra phản ứng...
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Câu 6. Hợp chất khí A có phân tử gồm 1 nguyên tử R liên kết vớ 2 nguyên tử oxi (O) và nặng hơn khí nitơ (N2) 1,571 lần. 1) Tính nguyên tử khối của R? Cho biết tên R? 2) Viết công thức hóa học của hợp chất khí A? Biết: C = 12, O =16, H = 1, S = 32, Na = 23, Mg = 24, P = 31, K = 39 Câu 7. Đốt cháy hết 9 gam kim loại magie Mg trong không khí thu được 15 gam magie oxit. Biết rằng, magie cháy là xảy ra phản ứng với khí oxi O2 trong không khí. 1) Lập PTHH của phản ứng. 2) Viết công thức về khối lượng của phản ứng. 3) Tính khối lượng khí oxi cần dùng? Câu 9. Đốt 5,4 gam kim loại nhôm Al trong không khí thu được 10,2 gam hợp chất nhôm oxit. Biết rằng, nhôm cháy là xảy ra phản ứng với khí oxi O2 trong không khí. (1) Hãy lập phương trình hóa học của phản ứng. (2) Viết công thức về khối lượng của phản ứng. (3) Tính khí oxi cần dùng cần dùng.

2
26 tháng 11 2021

Tham khảo

a) biết PTKN2=2.14=28(đvC)PTKN2=2.14=28(đvC)

vậy PTKA=28.1,571=43,988(đvC)PTKA=28.1,571=43,988(đvC)

gọi CTHH của hợp chất A là RO2RO2, ta có:

R+2O=43,988R+2O=43,988

R+2.16=43,988R+2.16=43,988

⇔R=11,988≈12(đvC)⇔R=11,988≈12(đvC)

vậy R là Cacbon (C)

26 tháng 11 2021

) biết PTKN2=2.14=28(đvC)PTKN2=2.14=28(đvC)

 

vậy PTKA=28.1,571=43,988(đvC)PTKA=28.1,571=43,988(đvC)

 

gọi CTHH của hợp chất A là RO2RO2, ta có:

 

R+2O=43,988R+2O=43,988

 

R+2.16=43,988R+2.16=43,988

 

⇔R=11,988≈12(đvC)⇔R=11,988≈12(đvC)

 

vậy R là Cacbon (C)

3.             Dựa vào câu trả lời cho trước, hãy viết câu hỏi về khoảng cách1.     ……………………………………………………?It's about 4576.89 miles from Beijing to Berlin.2.                 ……………………………………………………?It's about 1 kilometre from my hotel to the beach.3.                 ……………………………………………………?It's about 500 metres from here to the place where I live.4.                 ……………………………………………………?It is 200 kilometres from his hometown to the place where he lives now.5.                ...
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3.             Dựa vào câu trả lời cho trước, hãy viết câu hỏi về khoảng cách

1.     ……………………………………………………?

It's about 4576.89 miles from Beijing to Berlin.

2.                 ……………………………………………………?

It's about 1 kilometre from my hotel to the beach.

3.                 ……………………………………………………?

It's about 500 metres from here to the place where I live.

4.                 ……………………………………………………?

It is 200 kilometres from his hometown to the place where he lives now.

5.                 ……………………………………………………?

It is just 200 metres from the park to the parking lot.

6.                 ……………………………………………………?

It's approximately 4 kilometres from here to the airport.

7.                 ……………………………………………………?

It's about 60 kilometres from my parent's house to mine.

3

1.How long from Beijing to Berlin.

2.How long from my hotel to the beach.

3.How long from here to the place where I live.

4.How long from his hometown to the place where he lives now.

5.How long from the park to the parking lit.

6.How long from here to the airport.

7.How long from my parent's house to mine.

6 tháng 5 2021

3.             Dựa vào câu trả lời cho trước, hãy viết câu hỏi về khoảng cách

1.     How far is it from Beijing to Berlin?

It's about 4576.89 miles from Beijing to Berlin.

2.      How far is it from your hotel to the beach?

It's about 1 kilometre from my hotel to the beach.

3.               How far is it from here to the place where I live?

It's about 500 metres from here to the place where I live.

4.              How far is it from his hometown to the place where he lives now?

It is 200 kilometres from his hometown to the place where he lives now.

5.                How far is it from the park to the parking lot?

It is just 200 metres from the park to the parking lot.

6.                How far is it from here to the airport?

It's approximately 4 kilometres from here to the airport.

7.                 How far is it from my parent's house to mine?

It's about 60 kilometres from my parent's house to mine.

8 tháng 12 2017
The impact of the policy is not limited by time and not gian.Con people today still find inspiration reduced the book, had found several thousand years, from the mysterious drawings on clay slabs , the letters have long been so strange on the broken skin of sheep, these hieroglyphics on the tag tre ... until today, the books were printed by the printer series power from the porch dai.Mot living in a remote Asian villages can also read a book written from a distant country in Europe can not doubt Mi.That: books, the centuries and peoples closer together .
Book gives readers new insights about the world around them, the vast universe, about the country and the nation far xoi.Nhung science book can help readers discover the infinite universe with its rules, to understand the earth round its own take on how many different countries with different circumstances nhau.Nhung nature book helps sociological understanding of human life on other lands that together with economic characteristics, history, culture, traditions, aspirations.

Books, especially books of literature, helps us understand life within the human, through the different era, in the different ethnic, joys and sorrows, happiness and suffering , their hopes and their struggles.

Book helps readers discover ourselves, understand who you are among this vast universe, each person understand how relationships with others, with everyone in the community and ethnic community humanity nay.Sach help readers understand what is happiness, where is the suffering of each person and what to do to live right and go to a true life su.Sach expand horizons dreams and aspirations .

. The book, by Bruno, Galie on earth and our solar system has been opened for mankind a new era on the path of self-conquest of Dacuyn nhien.Nhung page book about the species not only help people understand the same species but also to better understand the child's nguoi.Sach Secspia, the Diderro, Monteskier then Macs, Angghen ... really do help people understand the way mang.Doc Bangdac world capitalism with the power of the strange poetry tien.Doc Tago, poetry Li Bai, Du Fu, one understands the life and soul of all those people toc.Doc Nguyen Du, Ho Xuan Huong, Cao Ba Quat ... I understand his past he used to dream of suffering and what ... It does not matter after all "the horizon" that the site has expanded its immediate policy ta.Co a summary to say that the interests of the book is very tan.Ta agree with the remarks of M. Gorki is also receiving advice contained in the statement implies that: Read the book, try reading as much as possible.
Since the capitalism, all of human manipulation, including books, have become not only found hoa.Sach is what people write for human readers, but also as a commodity for His publisher, the publisher of that search loi.Muc boss that, in general, are not serving humanity for profit, profit up da.Vi world, books on the market, not not always only the good book really noble purpose of man, but also has many books for the purpose of profit, have little to no harm humans.

What is a good book? That is the book accurately reflects the law of nature and of public life hoi.Chung help people understand his fate to be aware of their obligations true life book song.Mot good to help people understand each other to praise hon.No fairness and friendship between the peoples toc.No to make people more proud of themselves, believe more in life to fight for daily life and a reasonably happy hon.No to make human hearts become richer, more generous, more clarity.

Read books like, that is not only expanding horizon before our eyes but also in soul ta.Ta not only increase knowledge but also add value and strength.
8 tháng 12 2017

In my daily life, I have several hobbies such as cooking, surfing, listening to music and so on. However, I like reading books the most for some reasons. Firstly, reading makes me feel comfortable after many long stressful hours at school. I actually like comic books because they contain lots of colorful and interesting images that keep my spirit relax. Secondly, reading books provides me a great deal of diverse knowledge of many fields. For instance, I can know more specific culture of each country in The World's Cultures book. In addition, I can know more things about different life of various animals that are living around the world in the Discovery of Animals World book. Finally, reading helps to enhance my vocabulary in both Vietnamese and English language. In Vietnamese book, I can learn many traditional folks or proverbs that help me understand more deeply the beauty of my mother tongue. About English books, I can improve my English reading comprehension skill in study. Besides, my communication skill with the foreigners will be better, too. In conclusion, I really like reading books, for it brings many good things to me. I see it as an useful activity to learn how to make life more meaningful and beautiful.