\(S=\dfrac{1}{5^2}+\dfrac{1}{5^4}+...+\dfrac{1}{5^{2022}}.CMR:S< \dfrac{1}{24}\)

Tìm gtln hoặc gtnn: \(C=2,5-\left|x-3,5\right|\)

\(25-y^2=8\left(x-2009\right)\)

Tìm x: \(\dfrac{1}{2}-\dfrac{1}{4}+\dfrac{1}{8}-\dfrac{1}{16} +...-\dfrac{1}{1024}=\dfrac{x}{1024}\)

In the fỉrst semester, the ratio between excellent student and the rest of this class are 3/7. In the next semester, there are 4 good students becomes excellent, so that the number of excellent are 2/3 the rest. How many students are there in this class?

d

Em hãy đóng vai một hướng dẫn viên du lịch, giới thiệu với du khách nước ngoài về đất nước Trung Quốc/Nhật Bản/Hàn Quốc/Singapore bằng 5 câu (hoặc 5 dòng).

- Giới thiệu quốc gia: Vị trí, tiếp giáp, dân số, thủ đô,…..

- Các nét nổi bật trong văn hóa, con người

Each sentence below contains an error. Underline it and write the correct answer in the space provided (1 pt.)

1. My friend bought me some coffee maker for my birthday

2. Would you like any milk or fruit juice for dinner? 

3. Hoang is very interested in rock and roll and his classmates are, either. 

4. It’s a long time since the last time I have met your sister.

5. Yesterday I was sitting on the 6 o’clock train when I saw the strange man walking along the platform. 

6. They’d better not to set off on Monday morning because of heavy traffic.

7. He couldn’t run as quick as Maria. 

8. I wait here for ages. Where have you been?