Câu 2: Cho phương trình x2 + 4x + m +1 = 0 . Xác định m để phương trình a) Vônghiệm b) Cónghiệmkép c) Cónghiệm d) Có hai nghiệm phân biệt e) Có hai nghiệm trái dấu f) Có hai nghiệm dương phân biệt

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3. Use a relative pronoun to combine each pair of sentences below : 1. The umbrella belongs to my sister .You borrowed it lastnight ​ 2. Tri An hydro- electric plant is the biggest in South Viet nam . It was the joint work of Soviet and Vietnamese engineers and workers .​ ​ 3. This is my favourite author . I have read his books for many years now ​ 4. The woman is my mother .She understands me most ​ 5. The man is going to leave for Hong Kong tomorrow .You had dinner with him last night ​ 6. The teacher has a good voice . I can never remember the teacher’s name ​ 7. I enjoyed the music .We listened to it after dinner ​ 8. This doctor is famous .You visited him yesterday ​ 9. The students will surely be successful in their exams .The students study seriously and methodically ​ 10. The boy is my cousin .You made fun of him ​ 11. The teacher notices the students .They often come to class late ​ 12. Frank was one of the most creative artists in rock and roll .he came from California ​ 13. The man had much experience in climbing mountains .We consider him our teacher ​ 14. The artist was one of the best I had ever seen .I could not remember his name. ​ 15. The qualities are trust and loyalty .They are very important in a friend ​ 16. Frank invited Jane to the party .He had met her in Japan ​ 17. The girl stepped to the platform to receive the award .Her design had been chosen ​ 18. I need to find a painting . It will match the rest of my room ​ 19. There are too many poor people in the world .They do not have enough to eat ​ 20. The chickens are very fat .They are raised on our farm.

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