TL

There are many kinds of music in the word but my favourite is country music. First, this type of music is traditional and very popular in Vietnam. People can listen to it on radio, TV, CDs or on the Internet. Second, country music helps me relax. For example, when I feel stressed or tired, I always listen to my favourite songs. It makes me feel more comfortable. Third, country music can connect people together. In a party, especially in the countryside, people often get together and sing a popular song of this type. Generally, I think more and more people will listening to country music in the future.

Hok tốt

Most of my friends to stay inside to play video games, read books or watch TV, but I have a good hobby of going outside and playing sports. I play many different sports in my free time; some of them are soccer, swimming, volleyball and basketball. Sometimes I also ride the bikes or do board skating with my cousin in the park. In my opinion, doing sport is one of the rare hobbies that actually have good impacts on me. I am taller than most of my classmates thanks to swimming and basketball lessons that I take during summer time. My muscles are even stronger than my older brother, and I can last longer than most other people in any sport competition. Sports bring me a lot of benefits, and they are also fun things to do at the same time. I love the feeling of the cool water run through my face when I am swimming, and it seems I am flying whenever I take a dive underwater. When I play soccer, it is very exciting for me or my teammates to score a goal even though we do not take part in any tournament. Both of my physical and mental health become better after I play sports, so it can be considered as the best things to do in my free time. Sports are a part of my life besides other activities, and I will continue to play sports till I am too weak for them.

2. grandparents
3. single
4. single
5. daughter
6. surname 

husband (chồng) - grandparents (ông bà) - single (độc thân) - daughter (con gái) - surname (tên họ)

Vai trò thực tiễn của ngành chân khớp

Với số lượng loài lớn, mỗi loài lại thường sinh ra số lượng cá thể rất lớn nên chân khớp có vai trò thực tiễn to lớn.

* Có lợi:

- Làm thực phẩm như:  tôm, cua, ...

- Thụ phấn cho cây trồng như: ong, bướm, ...

- Bắt sâu bọ có hại như: nhện, bọ cạp, ...

- Nguyên liệu làm mắm như: tôm, tép, ....

- Xuất khẩu như: tôm hùm, tôm sú, ...

* Có hại:

- Làm hại cây trồng như: nhện đỏ, ...

- Làm hại đồ gỗ trong nhà như: mối, ...

- Có hại cho giao thông đường thủy như: con sun, ...

- Truyền nhiều bệnh nguy hiểm như: ruồi, muỗi, ...

`@` `\text {Ans}`

`\downarrow`

a: AD+DB=AB

AE+EC=AC

mà DB=EC và AB=AC

nên AD=AE

Xét ΔABC có AD/AB=AE/AC

nên DE//BC

b: Xét ΔABE và ΔACD có

AB=AC

góc A chung

AE=AD

=>ΔABE=ΔACD

c: Xét ΔIDB và ΔIEC có

góc IDB=góc IEC

DB=EC

góc IBD=góc ICE

=>ΔIDB=ΔIEC

d: Xét ΔAIB và ΔAIC có

AI chung

IB=IC

AB=AC

=>ΔAIB=ΔAIC

=>góc BAI=góc CAI

=>AI là phângíac của góc BAC

e: AB=AC

IB=IC

=>AI là trung trực của BC

=>AI vuông góc BC

\(2^4.5-\left[31-9^2\right]=16.5-\left(31-81\right)=80-\left(-50\right)=130\)

\(2^4\).5-[1.31-(13-4)^2]

=16.5-[1.31-81]

=16.5-[31-81]

=16.5-(-50)

=80-(-50)

=130