(x - 3)² = (1 - 3x)²

Thực hiện phép tính
(y  -3)(y + 3)(y² + 9) - (y² + 2)(y² - 2)

cho $\frac{x}{2}=\frac{y}{3}=\frac{z}{5}$. tìm x,y,z biết 3x²  + 2y² - z²

1/5.5+1/6.6+1/7.7+...+1/100.100 Chứng tỏ tổng đó lớn 1/6 và bé hơn 1/4

cho $\frac{x}{3}=\frac{y}{4}$ . tìm x, y biết 5x² - y² = 29

Change these following sentences into reported speech

1. They said: "We are learning English now ",

=> They said______________________________________________.

2. “My friend is coming next week”, Tom said.

=> Tom said______________________________________________.

3."I’ll help my mum with housework this weekend", she said.

=> She said______________________________________________.

4. "You will have to finish all these exercises before next week", the teacher said to his students.

=> The teacher said to his students__________________________________.

5."I came back here early yesterday", she said.

=> She said______________________________________________________.

6.Johnny said to his mother: "I don’t know how to do this exercise."

=> Johnny said to his mother________________________________________.

7. "We are waiting for the school bus", said the children.

=> The children said________________________________________________.

8. Mary said: "I cannot go to the movies with you, John".

=> Mary said_____________________________________________________

9.The man declared: "I shall be doing exactly the same work next Monday as I am doing today".

=> The man declared______________________________________________.

10.The woman said: "I was born in 1954 and I have been living in this small town since I was small".

=> The woman said______________________________________________.

11. "My teacher wants to have a talk with you tomorrow morning", Tom said.

=> Tom said_______________________________________________________.

12. Our teacher said: "The Second World War broke out in 1939".

=> Our teacher said_________________________________________________.

13.Linh said: "If my father repairs the bike now, I will ride the bike to school this afternoon."

=>Linh said_______________________________________________________.

14. "I would have passed the exam if I had tried my best", Binh said.

=>Binh said______________________________________________________.

15. The young man said to her: "If you didn’t agree with me now, I wouldn’t meet you anymore."

=> The young man said to her___________________________________________.

16. "If you aren’t doing homework, what will you do next?", I said to the boy.

=> I said to the boy___________________________________________________.

17.Quynh said to An: "If your father weren’t a billionaire, you could save your money".

=>Quynh said to An_________________________________________________.

18. We said to Xuan: "We won’t go camping if your family doesn’t join with us."

=> We said to Xuan____________________________________________________.

19. "If my parents hadn’t given birth to me fifteen years ago, I wouldn’t have seen the Earth", Hoang said.

=> Hoang said______________________________________________________.

20. "If a stranger appeared, what would you do?", he said to his brother.

=> He said to his brother______________________________________________.

21. Van said: "If I hadn’t missed the bus last morning, I couldn’t have been late at school".

=> Van said_________________________________________________________.

22.Khanh said to Thao: "If you had had breakfast, you couldn’t be hungry now".

=>Khanh said to Thao______________________________________________.

23. "Leave your address with the secretary", the assistant said to me.

=> The assistant asked______________________________________________.

24. "Phone to me for an answer tomorrow", the manager said to the client.

=> The manager told the client________________________________________.

25. "Don't leave these books on the table, put them back on the shelf, the librarian said to the student.

=> The librarian reminded the student_____________________________________.

26. "Be a good girl and sit quietly for five minutes", the nurse said to the child.

=> The nurse told the child______________________________________________.

27. "Leave your things here", my companion said to me.

=> My companion advised______________________________________________.

28. "Don’t forget to send your parents my regards", she said to me.

=> She reminded______________________________________________.

29. "You should join the football team, Eric", said the teacher.

=> The teacher encouraged____________________________________________

30. "Remember to lock the door before you go to school", my sister said.

=> My sister reminded______________________________________________.

$\frac{5}{3}$x²y + $\frac{7}{15}$xy²

mọi người ơi hiện tại em muốn học tiếng trung tại nhà thì nên bắt đầu từ đâu ạ

Giải phương trình sin² x - 2 cos x + 2 = 0.

7 Hđt
(x² -3) × (x⁴ + 3x² + 9)

Cho tam giác ABC vuông tại A. Có AB=AC.điểm D trên BC.Chứng minh BD² + DC² = 2AD²

13 x 17 - 256 : 16 + 49 mũ 3 : 7 mũ 5 - 1