Lớp 9
Lớp 1điểm
3 tháng trước
Đỗ Hồng Ngọc

Exercise 1: Chọn dạng đúng của động từ trong ngoặc 1. The trousers you bought for me (doesn't/ don't) fit me. 2. Physics (was/ were) my best subject at school. 3. Fortunately the news (wasn't/ weren't) as bad as we had expected. 4. The police (wants/ want) to interview Fred about a robbery. 5. Three days (isn't/ aren't) long enough for a good holiday. 6. Where (does/ do) your family live? 7. England (have/ has) lost all their football matches this season. 8. (Does/ Do) the police know about the stolen money? 9. Can I borrow your scissors? Mine (isn't/ aren't) sharp enough, 10. I'm going to take a taxi. Six miles (is/ are) too far for me to walk. 11. John, along with twenty friends, (is/ are) planning a party. 12. The picture of the soldiers (bring/ brings) back a lot of memories. 13. If the duties of these officers (isn't/ aren't) reduced, there will not be enough time to finish the project. 14. Advertisements on television (is/ are) becoming more competitive than ever before. 15. Living expenses in this country, as well as in many others, (is/are) at an all-time high. 16. Mr. Jones, accompanied by several members of the committee, (have/ has) proposed some changes of the rules. 17. The levels of intoxication (vary/ varies) from subject to subject. 18. Neither Bill nor Mary (is/ are) going to the play tonight. 19. Anything (is/ are) better than going to another movie tonight. 20. Skating (is/ are) becoming more popular every day. Exercise 2: Chia dạng đúng của động từ trong ngoặc 1. A number of reporters (be) at the conference yesterday. 2. Anybody who (have) a fever must go home immediately. 3. Your glasses (be) on the bureau last night. 4. There (be) some people at the meeting last night. 5. The committee already [reach) a decision. 6. A pair of jeans (be) in the washing machine this morning. 7. Each student (answer) the first three questions. 8. Either John or his wife (make) breakfast every morning. 9. After she had perused the material, the secretary thought that everything (be) in order. 10. The crowd at the basketball game (be) wild with excitement. 11. A pack of wild dogs (frighten) all the ducks away. 12. The jury (be) trying to reach a decision. 13. The army (have) eliminated this section of the training test. 14. The number of students who have withdrawn from class this quarter (be) appalling. 15. There (have) been too many interruptions in this class. 16. Every elementary school teacher (have) to take this examination. 17. Neither Jill nor her parents (see) this movie before. 18. There (be) no girls in this class. 19. There (be) no key for this door. 20. 80% of the students (have) voted. Exercise 3: Trong mỗi câu sau có một lỗi sai, tìm và sửa lại cho đúng. 1. Geography are fascinating. 2. Where is my gloves? 3. Each ticket costed $5. 4. The boy with his dog are here. 5. John or Tom are bringing the car. 6. His hair are turning gray. 7. Are there anybody at home? 8. Neither praise nor blame seem to affect him. 9. Three fourths of his fortune were devoted to scientific research. 10. Two-thirds of these books is novels. 11. There are a car and two vans in front of my house. 12. Why is the police standing there? 13.       So far everything is all right 14. More men than women is left-handed. 15. Fifty minutes are the maximum length of time allotted for the exam. 16. None of my classmates speaks Arabic. 17. Every student are tested twice a year. 18. Each of the items in the bill are correct. 19.10 years in prison were too long for him. 20. None of the children were awake.  

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Để tìm phân thức đối của phân thức -2/(x+5), ta chỉ cần thay đổi dấu của phân số đó. Vậy phân thức đối của -2/(x+5) sẽ là 2/(x+5).

Để tìm phân thức nghịch đảo của phân thức 1/(x-1), ta đổi vị trí của tử số và mẫu số. Vậy phân thức nghịch đảo của 1/(x-1) sẽ là (x-1)/1 hoặc x-1.

Hai phân thức 3x/y^2 và 3x^2y/xy^3 có bằng nhau khi k=1. Để về cùng một mẫu số, ta có thể nhân với y^3 mẫu số của phân thức đầu tiên và nhân với y^2 mẫu số phân thức thứ hai. Khi đó phép nhân sẽ trở thành 3x^2/y và 3x^2y^3/x. Sau đó ta thấy rằng cả hai phân thức đều là 3x^2/y khi k=1. Vì vậy, khi k=1, hai phân thức 3x/y^2 và 3x^2y/xy^3 sẽ bằng nhau.

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