wadays, computers are very popular and important among students in university. Computers are used by students for homeworks, finding informations and it helps them to study better.

Most of university students use computer to study, especially, they use it to learn English. When it comes to learning English, computer is very useful. For example, it helps us to look for new words easily. Also, we can learn how to speak, write and listen to English on computers. Computers help students to get better at studying and it has different useful things to help students in university. It is very common for students to use computer for school. We all need computers and Internet, so we can find informations on society and informations on studying purposes. Plus, it helps students to communicate with school and prepare for upcoming projects. This is extremely useful for students because it gives them time to studey and prepare for the projects.

Also, computers can be use as entertainment for students after school. It has different websites that we caan visit and have fun. If we know how to use it reasonably, it will become a good friend to us students.

In my opinion, computer is very important, and I can't not have it with me. Computers always have two-side affect. It can be intensely useful but also harmful if we misuse it. We all should know how to use computer the right way.

số lớn nhất có 6 chữ số là: 987 654

số bé nhất có 6 chữ số là: 102 345

tổng của số lớn nhất có 6 chữ số và số nhỏ nhất có 6 chữ số là:

    987 654+102 345=1 089 999

                               đáp số: 1 089 999

Ta có: 

 bz-cy/a=cx-az/b=ay-bx/c  

=> a(bz-cy)/a^2=b(cx-az)/b^2=c(ay-bx)/c^2 

 => abz-acy/a^2=bcx=baz/b^2=cay-cbx/c^2  

Ap dung tính chất của dãy tỉ số bằng nhau :  

Suy ra : abz-acy/a^2=bcx=baz/b^2=cay-cbx/c^2=a^2+... 

 => 0/a^2+b^2+c^2=0  vì bz-cy/a=0=>bz=cy=>y/b=z/c (1)  

=> cx-az/b=0=>cx=az=>x/a=z/c (2)  

Từ (1) và (2) => x/a=y/b=z/c

Thì tương lai gần bạn

S + going to + V + O

I.Choose the word having the underlined letter

1.C

2.C

3.A

4.D

5.D

6.A

7.D

8.D

9.B

10.D

II. Choose the best answer to complete the following sentence

1.D

2.A

3.B

4.A

5.A

6.D

7.A

8.A

9.A

10.B

11.A

12.B

13.C

14.D

15.C

16.A

17.B

18.D

19.D

20.A

III.

1. My brother ( not live) doesn't live in Hanoi. He ( live) lives in Ho Chi Minh City.

2. Our school ( have) has a small garden. There ( be ) are many flowers in it.

3. What time does your son ( get up) get up every morning ?

4.Do your parents ( go ) go to work every day ?

5. Nam ( wash) washes his face at 6.15.

6. We ( not have) don't have breakfast at 6.30 every morning.

7. She can (speak) speak English.

8. Look! She (come) is coming.

IV.Read the passage and choose the correct answer to complete.

My brother lives in HCMC. He (1) is a teacher of math. He goes to work (2) from Monday to Saturday. The school starts (3) at 7.00 in the morning and (4) ends at eleven fifty. After work, he comes back (5) home and has lunch at (6) a quarter past twelve. In the afternoon, he .(7) does the housework and plays games. In the (8)evening after dinner he watches T.V or (9) reads books. He goes to bed at half (10)past eleven.

VI. Read the passage and complete the table below. (2ms)

I’m Linh, Pham Thuy Linh. I am a new student of 7A class in Nguyen Du Secondary School. I am thirteen and I come from Hoa Binh. I have a brother and a sister. They are 500 students at a high school in Hoa Binh. I live with my aunt at 20 Le Loi Street. She often brings me to school by motorbike every day. It is more than two kilometers from my aunt’s

6+7-8+9-5= 9 tick nha miko hậu đậu

15.6+30.3+8.15

=15.2.3+30.3+4.2.15

=(15.2).3+30.3+4.(2.15)

=30.3+30.3+4.30

=30.(3+3+4)

=30.10

=300

Kim loại nào sau đây có màu trắng hơi xám?

A. Au.         

B. Fe.          

C. Ag.         

D. Cu.

2012.(2011-x)+25=5⁵:5³

=>2012.(2011-x)+25=5^5-3

=>2012.(2011-x)+25=5²

=>2012.(2011-x)+25=25

=>2012.(2011-x)=25-25

=>2012.(2011-x)=0

=>2011-x=0:2012

=>2011-x=0

=>x=0+2011

=>x=2011

2012.(2011-x) + 25 = 5⁵:5³ = 25

2012.(2011-x) = 25 - 25 = 0

2011 - x = 0

x = 2011 - 0 = 2011