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2 năm trước
Cho phương trình: x ²+2(m+1)x+m ²=0 (m là tham số) 1) Tìm m để phương trình có nghiệm 2) tìm m để phương trình có nghiệm $x_{1}$ ;$x_{2}$ sao cho $x^2_{1}$ +$x^2_{2}$ -5$x_{1}$ $x_{2}$=13
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Exercise 1: Chuyển các câu sau sang thể bị động 1. The waiter brings me this dish. 2. Our friends send these postcards to us. 3. Their grandmother told them this story when they visited her last week. 4. Tim ordered this train ticket for his mother. 5. She showed her ticket to the airline agent. 6. Jim baked this cake yesterday. 7. They are going to buy a new apartment next year. 8. The shop assistant handed these boxes to the customer. 9. The board awarded the first prize to the reporter. 10. Have you sent the Christmas cards to your family? 11. The committee appointed Alice secretary for the meeting. 12. Tom will give Anna a ride to school tomorrow. 13. They keep this room tidy all the time. 14. We gave Ann some bananas and some flowers. 15. They moved the fridge into the living room.

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