Hi friend,
This weekend, I don´t have to work and I use to work my weekends. It could be fantastic but I have a exam of english. Also I have a very bad exam because my grandmother and cousin were in the hospital. This Fryday, I improve my english for diferents ways as internet or books. My problem is that I´m not creative for writing part. If I have a e-mail for a friend, I don´t think ideas about a free weekend. It´s better for my that I talk about my real situation. After my exam of english I will have other exam more important for me because it´s for my perfect job with children in public education. I´m sorry that I can´t see you but I promise to see you on summer.
Your friend, Wind

Vocabulary and grammar: choose the best answer.

9. ___________Maryam paint a picture of Ha Noi?

A. Was. B. Were. C. Does. D. Did

10. Flowers should___________in warm places.

A. Kept. B. Be kept. C. Be keeping D. Be keep

Ta có: (1+1+1+1+...+....+....+....+...+...+1)*0

= A*0

Vì số nào nhân cho 0 cũng bằng 0 => tích trên = 0

\(1+\frac{1+\frac{1+\frac{3}{2}}{2}}{2}=1+\frac{1+\frac{\frac{5}{2}}{2}}{2}=1+\frac{1+\frac{5}{4}}{2}=1+\frac{\frac{9}{4}}{2}=1+\frac{9}{8}=\frac{17}{8}\)

\(1+\frac{2}{1+\frac{2}{1+\frac{2}{3}}}=1+\frac{2}{1+\frac{2}{\frac{5}{3}}}=1+\frac{2}{1+\frac{6}{5}}=1+\frac{2}{\frac{11}{5}}=1+\frac{10}{11}=\frac{21}{11}\)

\(1+\frac{1+\frac{1+\frac{2}{3}}{3}}{3}=1+\frac{1+\frac{\frac{5}{3}}{3}}{3}=1+\frac{1+\frac{5}{9}}{3}=1+\frac{\frac{14}{9}}{3}=1+\frac{14}{27}=\frac{41}{27}\)

\(\frac{3}{\frac{3}{\frac{3}{\frac{3}{2}+1}+1}+1}+1=1+\frac{3}{\frac{3}{\frac{3}{\frac{5}{2}}+1}+1}=1+\frac{3}{\frac{3}{\frac{6}{5}+1}+1}=1+\frac{3}{\frac{15}{11}+1}=\frac{59}{26}\)

suy ra

\(\frac{\frac{17}{18}}{\frac{21}{11}}-x=\frac{187}{378}-x=\frac{\frac{41}{27}}{\frac{59}{26}}=\frac{1066}{1593}\Rightarrow x=-\frac{1297}{7434}\)

She is combing her hair

As a child,I lived in a town called cornwall. My parents often took me go to the park where I used to play ‘hide and seek’ with some children.
There was a river near my house.Dad used to take me there.He taught me how to swim.I enjoyed swimming and playing games in the cool water. When I was six,my mother took me to school and I had my first lessons.My teacher was very smart and gentle but I felt afraid all the time. It took me a long time to get used to studying at school.
Five years later my family left cornwall. Last week I came back to visit it. Every thing became strange to me.There was only one thing:The river where I used to have a swim still look exactly the same.

No one can deny the benefits of the Internet for people in modern life. Nowadays, the Internet is popular everywhere in the world. The Internet provides many useful utilities for users. Firstly, the Internet is a big store of information. A lot of kind of information on any topics is available on the Internet. You can find it by searching in google.com, search.com, yahoo.com, etc. Besides, you can share information with other people around the world. Secondly, the Internet connects many people all over the world. You can get latest news of the world on the Internet. Most of the newspapers of the world are also available on the Internet. It is easier to keep in touch with your friends by chatting, e-mail or messages, …. Another benefit, there are many services on the internet such as online banking, job seeking, purchasing tickets for your favorite movies, and hotel reservations. Next, the Internet is a source of education. Many websites provide lectures, books and documents on different subjects or topics. You can also download these lectures into your own computer. You can listen and see these lectures repeatedly and get a lot of knowledge. You can take part in on-line courses, too. Finally, the Internet is a source of entertainment, you can see movies, listen music etc… There are also many games for you choose and you can play games with other people in any parts of the world on-line. In conclusion, the Internet is a very useful techology for everyone in many fields . It make our world a small village.

 Bx vuông góc với BC , Cy vuông góc cới BC

=> CBx= 90 độ ; BCy = 90 độ

CBx = ABx + ABC = 90 độ ﴾1﴿

BCy = ACB + ACy = 90 độ ﴾2﴿

Từ ﴾1﴿ và ﴾2﴿

=> ABx+ ABC + ACB + ACY = 90 + 90 = 180 độ ﴾3﴿

TAm giác ABC có A = 90 độ

=> ABC +ACB = 90 độ thay vào ﴾3﴿

ta có: ABx + ACy + 90 độ = 180 độ

=> ABx + ACy = 180 ‐ 90 = 90⁰