1. people said that he set up a lot of important projects

➜he is said to set up a lot of important projects

2. she stayed up too late last night , so she feels tired now

➜if she had not stayed up too late, she would not feel tired now

3. we are no longer late for school

➜we used to be late for school

4. just when i arrived home , it started to rain

➜no sooner had I arrived home than it started to rain

5. despite her poverty , mai made progress herself

➜although she was poor, she made progress herself

6. she hasn't seen them for six months

➜it's six months since she last saw them

7. lan said " it's very kind of you to go to the pagoda with me now , Diep . thank you! "

➜lan thanked Diep for going to the pagoda with me then

8. it is not esay for us to finish this task in time

➜we find it is difficult to finish this task in time

1. the man injured in the accident last night died on the way to the hospital

➜the man who was injured in the accident last night died on the way to the hospital

2. they have just sold the house at the end of the street

➜the house

3. the furniture was too old for us to keep

➜it was such old furniture that we couldn't keep it.

4. neil regrets having sold his car

neil wishes he didn't sell his car

5. immediately after his arrival, things went wrong

➜ No sooner had he arrived than things went wrong

6. very few cities are as expensive as tokyo

➜tokyo is the cheapest city

7. they haven't written to each other for almost two years

➜they stopped writing to each other almost two years ago

Gọi số cuối là h

Theo công thức tính số hạng ta cóa : 

(h-2015):1+1=100 (h là số cuối cùng của dãy)

(h-2015):1=100-1

(h-2015):1=99

h-2015=99x1

h-2015=99

=>h=99 +2015 = 2114

Tổng các số đó là ; (2114+2015)x100:2=206450

\(\Leftrightarrow\left(mm^2-m\right)x=2x+m^2+3m+2\)

\(\Rightarrow-2x+\left(m^2-m\right)x-m^2-3m-2=0\)

\(\Rightarrow\left(\left(m-2\right)x-m-2\right)\left(m+1\right)=0\)

\(\Rightarrow\left(m-2\right)x-m-2=0\)

\(\Rightarrow m-2=0\)

=>m=2

Hãy viết một bài văn bằng tiếng anh miêu tả ngôi nhà của em trong tương lai

In the future, I will live in a hi-tech house. It might be by the sea and it's will be surrounded by the blue sea. There are twenty rooms in my house. My house will has a big garage so that I can store my super cars. My future house will have wind and solar energy. I will use hi-tech and automatic machines such as a smart clock, morden fridge, and so on. There is a super smart TV in my house. I might surf the internet, watch my favourite TV programme from space or contact friends on other planets on this TV. I might also join online classes on TV and not have to go to school. I love my house very much.

88/105;59/70;89/105;179/210

You should say:

and explain why you enjoy visiting this place.

Advantage of living in a big city

Big city is where you can see many vehicles,many skyscrapers, many peple with a hurry pace of life. That place can fascinate us very much due to its light and luxury.Nowadays, more and more pople want to live there because they see many advantages. Indeed, in a big city, people can have the best chances to work as well as can enjoy the best service and entertaiment.

In a big city, people can take the chaces to study and work best. There are many good University for u to choose in a big city. There you can express your ability to study what you like. Moreover, when you graduate, you also find it easier to find chances to get a good job with good salary, that is quite difficult in small cities or countrysides; because there concentrates many big companies and groups. Hence, many graduate students choose big cities to live and work. In short, it is where you can take advantages f yourself.

In addition, in a big city you can enjoy the best service and entertainment. Because there are many rich people here, they can invest much money to get the best for them. Lives in a big city are quite luxurius but you don't have to be worried when you are sick or suffer a disease because there you can find good doctors for you, as long as you have muich money. What's more, in a big city you can enjoy new entertainment such as new games or luxury games.

Many people can argue that living in a big city makes them tired with noise and dash. They like the slow pace of life in a countryside. But I think that you can live there for a long ime because the young always like to enjoy new things and want to have much money, which is very difficult to do in a countryside. However, when you get older, especially when you retire, a countryside wll the best choice to live.

In summary, living in a big city has many advantages. However, you have to try your best to overcome all difficulties such as hard competition in workplace or polluted environment. you shuold not complain when face up to disadvantages of it.

Đặt A = 2¹⁰⁰-2⁹⁹-2⁹⁸-2⁹⁷-...-2-1

=>  A = 2¹⁰⁰- ( 2⁹⁹+2⁹⁸+2⁹⁷+...+2+1 )

Đặt M = 2⁹⁹+2⁹⁸+2⁹⁷+...+2+1 

=> 2M = 2¹⁰⁰+2⁹⁹+2⁹⁸+...+2²+2

=> 2M - M = (  2¹⁰⁰+2⁹⁹+2⁹⁸+...+2²+2 ) - ( 2⁹⁹+2⁹⁸+2⁹⁷+...+2+1  ) 

=> M

=889

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