My best friend speaks a lot in class, so the teacher often punishes him.

The remembers of the club don't meet in the morning, but in the afternoon.

a) |x| = 4

=> x = 4 hoặc x = -4

Vậy x \(\in\) { 4;-4}

b) Sai đề

1. Mai is a intelligent pupil.

2. There is a unique picture in a living room.

3. There is attractive present for winner.

Bài làm

Số cá có đánh dấu bắt được lần thứ hai chiếm \(\dfrac{2}{40}=\dfrac{1}{20}\)số cá bắt được. Giả sử số cá có đánh dấu được phân bố đều toàn bộ số cá trong ao là n con thì 30 con các có đánh dấu cũng phải chiếm \(\dfrac{1}{20}\) toàn bộ số cá n (con) tức là \(\dfrac{30}{n}\approx\dfrac{1}{20}\). Do đó \(n\approx30.20=600\) con.

n chỉ là một số gần đúng vì chưa tính số cá nhỏ hơn mắt lưới, mắt lưới càng nhỏ thì số cá ước đoán càng chính xác.

Among my friend, I cherish the most is Hoa. She is a good student of my class. She live with her parents in a small house near my house. She has long black hair, oval face and brown eyes. What particularly struck me about her was the smile. She look so lovely and friendly when she smile. She is form of triends that I can share everything. She always believed and helped me in every situation. She is gentle and edearing all friends. She likes Hary Potter, reding books, listening to music and arranging flowers. Hoa and I a lot in common with each other, has become good friends over the past seven years. Although time has passed long in any case, Hoa and I also trying to keep this friendship.

|10 - x| - 17 = -7

|10 - x| = -7 + 17 = 10

10 - x = 10 hoặc 10 - x = -10

10 - x = 10 => x = 0

10 - x = -10 => x = 20 

Do đó  x \(\in\) {0;20}     

Word forms

1. She's beautiful with a lovely smile.

2. She always worried about the safely of her family.

Rewrite the sentences, using have or has

1. My hair is black.

=> I have a black hair.

2. Mrs Huyen's eyes are round and black.

=> Mrs Huyen has round and black eyes.

3. His eyes are blue.

=> He has blue eyes.

4. Her cheeks are chubby.

=> She has chubby cheeks.

5. Miss Huong's face is round.

=> Miss Huong has a round face.

6. Miss Thanh's legs are long.

=> Miss Thanh has long legs.