Tìm xy thõa mãn:

x²+3y²-4x+6y+7=0

3x²+y²+10x-2xy+26=0

3x²+6x²-12x-20y+40=0

Cho xy thõa mãn 2(x²+y²)=(x+y)².Chứng minh rằng x=-y

Tìm GTNN

A=2a²+b²-2ab+10a+42

VII. Choose the best answer.

1. I found …….. money under my bed this morning.

A. an                                      B. a                                         C. some                                 D. –

2. Would you like ……..omelet for dinner?

A. -                                          B. an                                       C. a                                         D. the

3. I heard ……amazing story yesterday.

A. a                                         B. an                                       C. the                                     D. some

4. What was ……..story about?

A. a                                         B. an                                       C. some                                 D. the

5. Shall we go to ……Paris for the weekend?

a. -                                          B. the                                     C. the

6. ……..life is hard for ……elderly.

A. - / the                                B. the / the                           C. - / some                            D. the / some

7. Would you like ……..fruit?

A. a                                         B. the                                     C. some

8. Can you give me …………advice?

A. an                                      B. -                                          C. the                                     D. some

9. I enjoy listening to ……………number of programs on ……………radio.

A. a / the                               B. a /a                                                C. - / -                                     D. - / the

10. He got ……………job in ……………best company in town.

A. a / the                               B. a / a                                               C. the / a                               D. the / -

11. She might go to ……………school in ……………England.

A. - / -                        B. the / -                                C. a / a                                   D. - / the

12. We’re looking for _____place to spend _____night.

A. the/a                     B. a /the                                C. the/the                             D. a/a

13. We’ve got _____appointment (cuộc hẹn) this afternoon. I’ve got to go to _____doctor’s.

A. the / the               B. a /the                                C. the/a                                 D. a/a

14. _____ beginning of _____ film was fantastic but _____ end was terrible.

A. the / a / the                     B. the / a / an                   C. a / an / the                 D. the / the / the

15. Peter, likes to play ______ volleyball, but he is not _______ good player.

a. the / Ø                        b. Ø / a                      c. the / the                           d. a / the

16.My daughter is learning to play _______ violin at _______ school.

a. the / a                         b. a/ the                    c. the / Ø                               d. Ø / the

17. He was refused because he had no _______ experience (kinh nghiệm) about _______ job he applied (nộp đơn xin việc).

a. a / the                         b. an / Ø                    c. the / a                               d. Ø / the

18. What ______ beautiful dress you are wearing!

- Thank you. That is _______ nice compliment (lời khen).

a. a / a                             b. the / Ø                  c. Ø / Ø                                  d. the / the