Tìm m để phương trình sau có nghiệm: 1) $x^{2} + 2mx + m^2 - m = 0$ 2) $x^{2} + 2x + m - 2 = 0 $ 3) $x^{2} - (2m - 1)x + m^2 - 2m$ 4) $x^{2} + (2m - 3) + m^2 -2 = 0$ 5) $x^{2} - 2(m-1) + m^2 - 1 = 0$ 6) $x^{2} - 2(m + 4)x + m^2 - 8 = 0$

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Rewrite the sentences without change their meanings: 1. Lan didn’t go to school yesterday because of her sickness. -> Because Lan……………………………………………………………………….. 2. Because it is rain, we stopped the match. -> Because of …………………………………………………………………………____ 3. Because Tom was ill, he is absent today. -> Because of …………………………………………………………………………. 4. Because she is kind, everyone loves her. -> Because of ………………………………………………………………………….. 5. Because I was too tired, I will have a long trip. -> Because of ………………………………………………………………………….. 6. Because he passed the exam, his parent very proud of him. -> Because of ………………………………………………………………………….. 7. The house is dirty so I can’t feel comfortable. -> Because of ………………………………………………………………………….. 8. She is a beautiful girl so her husband very loves her. -> Because of ………………………………………………………………………….. 9. It’s hot so we will travel to the beach this weekend. -> Because of ………………………………………………………………………….. 10. This problem is difficult so I can’t understand. -> Because of ………………………………………………………………………….. 11. I got mark 10 in Math exam so I am very happy today. -> Because of ………………………………………………………………………….. 12. Because of the strong wind, they can’t jogging. -> Because ……………………………………………………………………………... 13. Because of his bad action, she doesn’t like him. -> Because ……………………………………………………………………………... 14. This soup is very hot. We can't eat it. (too) -> ……………………………………………………………………………................. 15. This morning is very cold. We couldn’t go swimming. (too) -> ……………………………………………………………………………................. 16. The room was very dirty. Nobody can learn it. (too) -> ……………………………………………………………………………................. 17. She can’t carry the box; it’s very heavy. (too) -> ……………………………………………………………………………................. 18. It was very late. She couldn’t go home. (too) -> ……………………………………………………………………………................. 19. The class was very tired. The teacher couldn't explain the lesson. (too) -> ……………………………………………………………………………................. 20. They can’t sleep. They aren’t tired. (too) -> ……………………………………………………………………………................. 21. She couldn’t see the film because it was very boring. (too) -> ……………………………………………………………………………................. 22. These oranges are ripe. You can eat them. (enough) -> ……………………………………………………………………………................. 23. She is old, so she can drive a car. (enough) -> ……………………………………………………………………………................. 24. The buffalo isn’t big. He can’t harm you. (enough) -> ……………………………………………………………………………................. 25. The ice is quite thick. We can walk on it. (enough) -> ……………………………………………………………………………................. 26. He is rich. He can buy the car. (enough) -> ……………………………………………………………………………................. 27. I don’t have much money. I can’t buy this dress. (enough) -> ……………………………………………………………………………................. 28. Your brother was clever. He could do this exercise in a few minutes. (enough) -> ……………………………………………………………………………................. 29. There is a lot of food in the fridge. We can eat it during the weekend. (enough) -> ……………………………………………………………………………................. 30. The truck can go through the gate because it is very wide. (enough) -> …………………………………………………………………………….................