Dễ thấy : \(\dfrac{2017}{2018}>\dfrac{2017}{2018+2019}\)  ; \(\dfrac{2018}{2019}>\dfrac{2018}{2018+2019}\)

\(\Rightarrow A=\dfrac{2017}{2018}+\dfrac{2018}{2019}>\dfrac{2017+2018}{2018+2019}=B\)

   Ta có             \(2^{13}.5^8.10\\ \\ =2^8.2^5.5^8.10\\ \\ =\left(2^8.5^8\right).2^5.10\\ \\ =10^8.10.32\\ \\ =10^9.32\\ \\ =32000000000\)⇒  \(2^{13}.5^8.10\) có 11 chữ số

\(a=2^{13}.5^8.10\)

\(a=2^8.2^5.5^8.10\)

\(a=\left(2^8.5^8\right).2^5.10\)

\(a=\left(2.5\right)^8.32.10\)

\(a=10^8.32.10\)

\(a=1000...0\left(8cs0\right).10.32\)

\(a=1000...0\left(9cs0\right).32\)

\(a=32000...0\left(9cs0\right)\)

\(\Rightarrow a\) có 11 chữ số

a có 11cs

Câu 2

-Theo số liệu năm 2002 dân số Châu Á chiếm gần 61% dân số thế giới

-Dân số Châu Á ngày càng tăng

-Tỉ lệ gia tăng dân số tự nhiên cao ( 1,3% )

-Kế hoạch hóa gia đình còn thấp,kinh tế chủ yếu là nông nghiệp

Câu 1

Đặc điểm địa hình

-Dãy núi chính:Hy-ma-lay-a,Côn Luân,....

-Sơn nguyên:Trung Xi-bia,Tây Tạng,........

-Đồng bằng:Tu-ran,Lưỡng Hằng,......

-Châu Á có nhiều hệ thống núi,sơn nguyên cao,đồ sộ và nhiều đồng bằng rộng bậc nhất thế giới.

-Các dãy núi chạy theo 2 hướng chính:Bắc Nam,gần Bắc Nam,Đông Tây,gần Đông Tây.

=> Địa hình bị chia cắt rất phức tạp.

-Các núi và sơn nguyên cao tập trung ở vùng trung tâm.Trên các núi và sơn nguyên cao có băng hà bao phủ quanh năm.

Khoáng sản:

-Có nguồn khoáng sản phong phú,có trữ lượng lớn.

-Các khoáng sản quan trọng:dầu mỏ,khí đốt,......

1. Write about your favourite TV programme.

I like to watch Television. I used to watch cartoon programmes, general knowledge programmes and craft programmes. Among all ,I love the Programme ‘craft’, shown on the Kids Channel every day at 6 o’ clock in the evening. I am very fond of this Programme because they show how to make decorative items with the help of various things. With waste items like old newspapers, ice cream sticks, disposable plates and glasses, plastic bottles etc. The timing of this Programme is also suitable for me as it showed in evening. I made many things by learning through this Programme like plastic bottle castle, Ice cream sticks lamp etc. Everyone praised my efforts. I love this Programme and don’t miss even a single episode.

2. Write about your favourite sport.

My favorite sport is football. In America people called it Soccer. But I like to call it Football. It has been my favorite sport almost for 10 years, when I was 15 years old, and it still is, even though I’m not practicing it anymore. Nowadays, most of people in the world like football,so it is called the king of sports. Why do people like it? I think the most reason is it easy to play. You can play football every where if you just have a ball with the right size. Not only men play football but also women can play. There is the World Champion for men players each 4 years, and for Women as well. In addition, football have a big attraction. When World cup took place, a large number of millions people watched it on TV and saw it directly. Now there are many football club in each country, even district, school in the world. In the football today there are much more money involved, especially in sponsors. But player also cost a lot, There are many players as C.Ronaldo, Beckham, Zidane who cost over 50 million euro, even over 100 million euro. Many big and famous club have large stadiums with alot of fan in all over the world. They can get a great number of billion US dollar from broadcasting copywrite every year and a big avenue from sponsors and advertising. That prove the attration of football. To me, I like football because it's a useful, healthful, collective but competitive sport. I like fresh air on stadium on each match. Anyways football always is the most favorite sport of mine.

3. Write about your future house.

House is a place where we can shelter and it gives us a protection from rain, heat , storm etc. Everyone has their own choice on what type of house they feel comfortable to live, so do I. I enjoy to live in calm and open environment, so house built on small land won't be my choice. I want a large open space surrounded by compound where I can stroll especially when I feel bored on my job. I want the garden in front of my house which will give me natural environment. One more thing to mention here, I want the house which is far from main city and industrial area since I don't like the noisy environment.Oh, yeah, what about the size of the house? I prefer the medium size house having 2 or 3 floors. I don't like very large building because I have small family and I don't like to rent my home. I prefer to stay in second or ground floor during the summer season because the top floor is excessively heated during the very season whereas I like to stay in second or third floor during the winter as ground floor will be excessively cold during that period. Next thing is about gym room, I would like to have a fitness center within my premise as I am a young boy and I want to be a healthy person. 

I have mentioned so many physical needs in my above paragraph but I would like to conculde my writing saying cool and amicable family environment is must to make our home like a heaven. Otherwise, it will be a hell and we would like to spend most of our time outside the home rather than with family.

1. Write about your favourite TV programme:

   I am not particularly keen on watching TV, as in my opinion, not many TV programmes are worth watching but unfortunately the good ones end very late at night. As I often have to get up very early I prefer not to watch those films which finish very late, however good they may be.

   "Operación Triunfo" and "Mira quien baila" are some of the programmes that I usually watch. They both have something in common: they are both about acquiring artistic skills through effort and hard work. The difference between these programmes is the way they end. In the first programme the winners donate the prize money to a NGO. In the second programme the winners are offered a recording contract.

   In conclusion, these programmes are family orientated. The presenters and contestants in both programmes are friendly and funny, so enjoyment is guaranteed. I really enjoy watching the dancing and listening to the songs.

2. Write about your favourite sport:

   My favorite sport is playing badminton. There are four reasons why I like it. Firstly, I can improve my health through playing it. I play it about 2 times every week. It makes me feel energetic everyday. Secondly, I enjoy the feeling that badminton flies in the air. I can change the movement direction of badminton without much effort and make opponent lose it. Thirdly, I can make many friends when I play badminton. I often play it with many kinds of persons. We can improve our skills with exercises. Also we talk about many interesting things when we have an break. Finally, playing badminton is not as intense as other sports such as basketball and soccer. It lessens the possibility of being hurt. So If you like playing badminton, please feel free to contact me. I think we can exchange experiences and make friends.

3. Write about your future house:

   House is a place where we can shelter and it gives us a protection from rain, heat , storm etc. Everyone has their own choice on what type of house they feel comfortable to live, so do I. I enjoy to live in calm and open environment, so house built on small land won't be my choice. I want a large open space surrounded by compound where I can stroll especially when I feel bored on my job. I want the garden in front of my house which will give me natural environment. One more thing to mention here, I want the house which is far from main city and industrial area since I don't like the noisy environment.Oh, yeah, what about the size of the house? I prefer the medium size house having 2 or 3 floors. I don't like very large building because I have small family and I don't like to rent my home. I prefer to stay in second or ground floor during the summer season because the top floor is excessively heated during the very season whereas I like to stay in second or third floor during the winter as ground floor will be excessively cold during that period. Next thing is about gym room, I would like to have a fitness center within my premise as I am a young boy and I want to be a healthy person. 

   I have mentioned so many physical needs in my above paragraph but I would like to conculde my writing saying cool and amicable family environment is must to make our home like a heaven. Otherwise, it will be a hell and we would like to spend most of our time outside the home rather than with family.

There are many programmes on TV but my favourite TV programmes is Tom and Jerry.

This film is from the Americ. It is always shown on Cartoon Network " Tom and Jerry" cartoon is talking about conjlict between cat and mouse. Tom and Jerry was living under one roof. The main character is Tom and Jerry. Tom jealousy and love to over come other people, but he is very stupid. Mean while, Jerry is smart and agile.

I love it very much because the film gave me good lessons about friendship.

Tick cho mik nha!! bài của mik là 1 bài hay đó!!! tick nha!!

lớp 9 được không học trước cho nó thông minh

Nội quy: 

- Thích đăng cái gì thì đăng

- Chửi nhau thoải mái không vấn đề gì

- đất nước tự do ae cứ chém gió

Bạn đã chấp hành đúng nội qui! Xin chúc mừng

https://vndoc.com/de-thi-hoc-ki-2-mon-toan-lop-5-theo-thong-tu-22/download

Among many programs and channels available on TV these days such as the current news programs, sport programs, entertaining programs, educational programs and movie programs, etc, I the program "the World of Animals" most.

This program is usually shown on VTV2 everyday at 8.30 in the evening. It often lasts about 45 minutes. In this program, stories of the life of many animals in the world are told in a very lively way. For example, people can watch films about monkeys, snakes, tigers, insects, birds, sea turtles, sharks etc and even the penguins and the polar bears in the far North. While watching these films, I find the everyday life activities and habits of these animals very interesting and full mysteries. In addition, I also learn that it is very important to protect these animals and their living environments because they are part of our valuable natural world. Watching this program makes me very well informed and relaxed after a day of work.

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