Đáp án:
Giải thích các bước giải:
x-√x +1=o
⇔ x - 2*√x*1/2 + 1/4+ 3/4 = 0
⇔ (√x - 1/2)² + 3/4 = 0
⇒ vô lí vì (√x + 1/2)² + 3/4 >0 ∀x => pt vô nghiệm
Đặt √x = a=> $a^{2}-a+1$ ($a=1; b=-1; c= 1$)
Δ=$b^{2}-4ac=1-4=-3 <0$ Vậy phương trình $a^{2}-a+1$ vô nghiệm=> Phương trình $x-$$\sqrt{x}+1$ vô nghiệm
36. You cannot ride a motorcycle because you are still young. You aren't 37. We intend to invite her for dinner tomorrow. We are 38. I often went fishing with my father when I was young. I used 39. "Don't touch this button or you'll get a shock", his father said to him. His father told 40. Talking to you is my pleasure. I am
Complete the sentences with and, so, but or because. 5. I didn’t feel well __________ I stayed at home. 6. I want a new TV __________ the one I have now is broken. 7. I had to work on Saturday __________ I couldn’t go to John’s party. 8. My name is Jim __________ I’m your new teacher
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i doubt whether it will stop raining till afternoon => It is ...
IV. Put the verbs into the correct form (TOBE/TO HAVE) 1.Nam _________(not/have)a dog,but he __________(have) a cat. 2.My father ________(not/be)a doctor.He (be)___________(be)an engineer. 3.We _________(have)English.Maths and Science on Monday. 4.She __________(be)from America.She (be) _______American. 5.The children __________(have) 6.Cars _____(be) more expensive than motorbikes 7.Jane always ______(have) breakfast at 6 o’clock 8.Mary and Linda often ______(have) an English class on Sunday 9.London________(be) a verry big country 10.I _________(be) a student and my parents _______(be) teachers
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Chuyển các tính từ sau sang dạng tính từ hơn nhất
ai vẽ được quỷ kiếm dạ xoa không
II. Lexical 1. Look at these two shirts. Which do you like…..? A. most B. best C. more than D. better 2. It’s time you…..your hair cut. A. will have B. have C. are having D. had 3. Most people spend…..they earn. A. as much as B. not much as C. little than D. as many as 4. The film was so boring so he…..asleep. A. falls B. feels C. felt D. fell 5. You shouldn’t spend much time…..such nonsense things. A. to do B. do C. doing D. for doing 6. Would you like some more hot milk?..... A. No, please B. Yes, thanks C. Yes, please D. No, I don’t 7. She has to stay at home to take care of her mother. ...... A. He has, too B. So does he C. Neither does he. D. So has he 8. I am sure you will get used......the streets soon. A. to crossing B. to cross C. cross D. with crossing 9. Cameras can help protect our premises…..robbers. A. on B. for C. from D. about 10. …..you do, you must be careful. A. However B. As well as C. Moreover D. Whatever 11. Do you know when.......? A. was he born B. he was born C. did he born D. was born he 12. I can’t find my dictionary at the moment. I hope it will…..up soon. A. turn B. come C. clear D. look 13. The children…..a funny story and wrote it on the card. A. passed off B. made up C. took off D. went out 14. The Second World War…..in 1939. A. broke out B. brought about C. turned up D. took out 15. There…..be something wrong with the computer. It doesn’t work now. A. must B. ought C. will D. would 16. If you want to…..healthy you should eat more vegetables. A. run B. have C. stay D. live 17. All medicines should be kept out of the…..of children. A. hold B. hand C. reach D. catch 18. We still prefer living here…..it’s quite noisy. A. because B. though C. if D. unless 19. The disease..…widely all over the country. A. spread B. affected C. influenced D. caught 20. I prefer staying home…..out with them. A. to going B. rather than go C. better than go D. more than go 21. His…..of the safety regulations really can't be ignored any longer. A. disregard B. unfamiliarity C. carelessness D. inattention 22. Let's…..the place; it looks so gloomy and unpleasant. A. miss B. abandon C. depart D. disappear 23. What are you saying is quite….., so give us, please, more details on the situation. A. famous B. accustomed C. obvious D. familiar 24. For a short while, I managed to catch…..of the President entering the Palace. A. vision B. notice C. view D. sight 25. The first thing for all of you to remember is that…..your duties may result in instant dismissal. A. escaping B. neglecting C. resisting D. missing Help ạ
Giải phương trình $(x^2+5x-2)^{2}$ =4($x^{2}$ +2)(5x-4)
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