Số các số hạng: ( 100-2) : 2+1= 50(số)

tổng các số trên : (100+2) x50: 2=2550

ĐS: 2550

trợ 3 chuyến và chuyến cuối cùng thì người còn lại bám vào những cục đá kia, đúng ko?

Some people think that it’s better for their children to grow up in the countryside; other people think that it’s better their children to grow up in a big city. Both possibilities have some advantages and disadvantages. I’ll give advantages of each approach and I’ll argue in favor of this that it’s better for children to grow up in the countryside.

In a society where money, career and convenience are important things, many people prefer to live in big cities. Consequently their children grow up there. In the following passage I’ll state some important aspects of the life in the big cities. People go to live there at many reasons. First, a big city provides many opportunities for career and education. For instance, If I live in South Dakota I’ll have chance to live in connection with nature but there are few universities and work positions. However if I live in New York I’ll have opportunity to choose between hundreds of universities and thousands free work positions. This connection If our children grow up in a big city, they will have chance to study in prestige school. Besides, they will be prepared for the life with strong competition.

However we know that the life in a big city has some disadvantages. For instance, stress is problem number one in a big city. That is why many people think that it’s better for their children to grow up in the countryside. The life there has many advantages. First, children, which grow up in the countryside, have chance to live with connection with nature. In most cases there are more calmly and they seldom suffer from psychical diseases in contrast with children which grow in a big city. The life in the countryside is not so dynamic than life in the big city. In the countryside there are few changes. For example, children often spend their childhood in one house, they study in one school, and their parents rarely change their work positions, which reflect negative on the children. To sum up, the life in the countryside is related to few problems than this in a big city.

In conclusion, I think that it’s better for children to grow up in the countryside. That is why, the first thing that we must save is health of our children.

Finish the second sentence so that it has the same meaning as the first.

1,the journey is so interesting .

→what an interesting journey!

2,no one in my class is more intelligent than her.

→she is the most intelligent in my class.

3,what about staying at home and watching TV ?

→why don't we stay at home and watch TV?

4,my father is a careful driver .

→my father drivers carefully.

chọn câu trả lời đúng

5. How about that shirt? May i try ____ it ?

A. to wear B. wearing C. X D. worn

How do you spend your summer holiday ?

Bài tham khảo:

Of course, my summer was spent in the northern hemisphere; if you are in South America, Australia or lots of other places, it would not be summer. But, for now, let's write about vacation (or a break from work or school).
For the last couple of months, I have been staying at a small lake in mid-Michigan, USA. Michigan is surrounded by several Great Lakes, but we did not stay on one of them. Anyway, it has been a rainy and cool summer and we haven't been able to enjoy boating or swimming very much. However, we have enjoyed feeding the birds; there are many different ones that you don't see at all in cities. Also, we have seen many deer; just this morning I saw a doe with two of her babies, two beautiful little fawns. And on our walk around the lake today, we saw bear tracks! I am just very glad that I did not see a bear!
And one of my very favorite things is lilstening to the loons. They have a very distinctive call that is eerie and would scare you if you didn't k now what it was. However, they are pretty birds that really like to catch fish from the lake.

Where do you want to live ? Country or city ? Why ?

Where do you prefer to live in, a big city or a country? It's difficult to answer. I think the answer depends on ages, hobbies, characters of each person. However, in my opinion, I'd like to live in the city. I lived in the country when I was born and I moved here three years ago. So, I can give the reasons for my answer from my real experiences. 1. There are many good schools in the city, so I can have chances to get the best education. 2. After studying, I have many choices of jobs, and of course the salary is higher. 3. Also, you are not going to feel boring because there many places worth to go in the city such as many different restaurants, clubs, movie theaters, and parks... 4. In addition, you must not have a car or a bike because there are many kinds of public transportations. 5. In the other hand, a big city always has big roads to move from this side of the city to another. 6. The city where we can buy any kind of item like foods, clothes, electronics... Beside the advantages there must be some disadvantages like: The city has a dirty air and polluted environment, so people can get sick easily, I think they're a part of reasons that there are many hospital in the city. However disadvantages are not a big problem, they can't cover the advantages. In short, city is the best to me.

Đặt câu hỏi cho từ gạch chân dưới đây

1. She studies Math on Monday and Thursday.

=> When does she study Math?

2. My favourite subject is Art.

What is your favourite subject?

3. The scool library contains over 20 thousand books

How many books does the school library have?

Giả sử xếp mỗi hàng 15 em và số hàng vẫn bằng như xếp mỗi hàng 12 em thì số học sinh nhiều hơn tổng số học sinh khối 5 là:

15 x 4 = 60 ( hs )

Một hàng 15 em hơn một hàng 12 em là :

15 - 12 = 3 ( hs )

Số hàng khi xếp 12 em vào 1 hàng là :

60 : 3 = 20 ( hàng )

Số học sinh khối 5 là :
12 x 20 + 5 = 245 ( hs )

               ĐS: _______________

3x^2 - 8x + 4

= 3x^2 - 6x + 2x + 4

= 3x(x - 2) + 2(x - 2)

= (x - 2) (3x + 2)