Cho phương trình: x²-2(m-3)x+(m-4)=0 (1) a) giải phương trình với m=1 b) Chứng minh phương trình (1) luôn có hai nghiệm phân biệt c) Xác định m để phương trình có hai nghiệm trái dấu d)Tính theo m giá trị của biểu thức A=1/x1+1/x2.Tìm m để A € Z để A € Z
Supply the correct form of the word in the brackets (0.5pt)
10. Many researchers are interested in.
features of Viet Nam. (geology) 11. May I have a ....... about the trip to Cuc Phuong National Park next week? (suggest).
12. You have a social skill that means you have a good.... ..skill. (COMMUNICATE)
13. There are some.... ....craft villages in Le Thuy district (TRADITION) Give the correct forms of the verbs in blankets: (0.5pt)
14. Nam didn't know where. more information about the course yesterday. (find)
15. 1. the door before I went to school.
(lock)
16. They used to... to school by bike when they were young (go)
17. My uncle. over 20 countries by the time he was 30 years old. (visit)