Đáp án:
Giải thích các bước giải:
`( x + 1 ) ( 3x^2 + x - 2 ) - x^2 (3x + 4) = 5`
`⇔ 3x^3+x^2-2x+3x^2+x-2-3x^3-4x^2-5=0`
`⇔ 3x^3-3x^3+x^2+3x^2-4x^2-2x+x-2-5=0`
`⇔ -x-7=0`
`⇔ x=-7`
Vậy `S={-7}`
`(x+1)(3x²+x-2)-x²(3x+4) = 5`
`⇔3x³+x²-2x+3x²+x-2-(3x³+4x²) =5`
`⇔ 3x³+4x²-x-2-3x³-4x²=5`
`⇔ -x-2=5`
`⇔ -x = 7`
`⇔ x= -7`
Vậy TN S ={-7}
CHOOSE THE ANSWERS. ( PHRASAL VERBS) 20. He did not particularly want to play any competitive sport. A. use up B. do with C. take up D. go on 21. I am tired because I went to bed late last night. A. stayed up B. kept off C. put out D. brought up 22. The small white flowers are my favorite. They give off a wonderful honey smell that scents the entire garden. A. release B. stop C. end D. me 23. I felt let down when I didn't receive a birthday card from my sister. A. disappointed B. interested C. excited D. bored 24. Do you have to light up another cigarette? I thought you were trying to cut down. A. burn B. illuminate C. save D. smoke 25. I couldn't make out what he had talked about because I was not used to his accent. A. stand B. understand C. write D. interrupt 26. The firefighters fought the blaze while the crowd was looking on it. A. blowing B. watering C. preventing D. watching 27. The police are looking into the murder. A. redoing B. investigating C. doing D. ignoring 28. Within their home country, National Red Cross and Red Crescent societies assume the duties and responsibilities of a national relief society. A. take on B. get off C. go about D. put in 29. Giovanna doesn't get along with her two brothers. A. agree with B. hate C. please with D. have a good relationship with 30. You don't need a computer. You can get by with the typewriter. A. understand B. manage with C. buy D. pass with 31. I fell into the water when I tried to get out of the canoe. A. enter B. start C. climb D. exit 32. I want you to carry on with the project while I am out of town. A. bring B. end C. abandon D. continue 33. If the world’s tropical forests continue to disappear at their present rate, many animal species will be extinct. A. die out B. die from C. die of D. die for 34. Didn’t they notice the “No Camping” sign? A. keep up with B. catch sign of C. take advantage of D. keep track of 35. Now, Peter has become accustomed to driving to the left A. has got used to B. has become upset with C. has become angry with D. all are correct 36. The bomb went ____with a loud bang which could be heard all over the town. A. on B. off C. out D. by 37. Go _________ this book because it has the information you need. A. over B. by C. off D. on 38. She looked _________ me, smiling happily and confidently. A. on B. over C. forward D. at 39. I arranged to meet Jim after work last night but he didn’t turn _________ A. off B. up C. on D. down 40. I’ve lost my keys. Can you help me look _________ them? A. up B. after C. for D. into 41. She still can't get _________ the shock for her baby's death. A. out B. on C. over D. away 42. As time goes _________ my memory seems to get worse. A. down B. by C. out D. away 43. You’d better put _________ your coat before you leave. It’s chilly out. A. off B. on C. out D. up 44. Frankly speaking, your daughter does not take _________ you at all. A. after B. along C. up D. over 45. We are going _________ a few days for the holidays. A. away B. up C. on D. out 46. Let’s have dinner, ________? A. will he B. shall we C. won’t we D. shan’t we 47. I came ________ an old friend on the street yesterday morning. A. over B. across C. down D. in 48. Will you see ______ Mr. Nam at Tan Son Nhat airport tomorrow morning? A. over B. down C. off D. in 49. Minh’s father often takes him ______ the park every summer. A. on B. to C. in D. after 50. He _______his father in many ways. A. takes over B. takes down C. takes on D. takes after 51. I’ll pick you ________at your hotel next Monday. A. on B. off C. at D. up 52. Your hat doesn’t go ________your clothes. A. up B. with C. of D. down 53. The plane will ________ at 06.30 so you must be there at 06.00. A. take after B. take down C. take off D. take up 54. The thieves waited until it was dark enough to ___________his house yesterday. A. broke into B. broke out of C. broke away D. broke through 55. The bomb missed it mission then __________. A. went down B. went off C. went through D. went away 56. The earth is a(n) ___________. A. satellite B. state C. planet D. star 57. I borrowed this coat _________my father. A. from B. to C. at D. by 58. If you need an extra bed for your guest, you can use one of __________. A. our B. us C. ours D. we 59. We went by car but the children went _________foot. A. on B. by C. to D. with A. exhibited B. exhausted C. exhaled D. erupted
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People who get little sleep will be tired => if people
TRẢ LỜI CÂU HỎI 1.Somebody cleans the room everyday 2. An old woman feeds the pigeons 3.He broke the window 4.Everyone is going to love her 5.Peter will drive the bus 6.She was watering the plants 7.They have opened the door 8.They speak English in that shop 9.People speak English all over the work TRẢ LỜI ĐƯỢC VOTE 5*
$ ( x + 1 ) ( x^2 + 2x - 1) - x^2 (x+3) = 4$
Tính. `1/2+1/4+1/8+1/16+1/32+1/64+1/128`.
Con trâu đực trắng (1)giao phối với 1 trâu cái đen (2) đẻ lần thứ nhất 1 nghé trắng (3) và lần thứ 2 là 1 nghé đen (4) . Con nghé đen lớn lên giao phối với 1 trâu đực đen (5) sinh ra 1 nghé trắng (6) . Xác định kiểu gen của 6 con trâu nói trên?
IV. Read the following text about doing Yoga and do the tasks that follow. Yoga originates in India and it is good for both your body and mind. Anyone can do yoga – women or men, adults or children. Special children’s classes are devised to help them to cope with pressures they feel from their schoolwork. By learning how to co-ordinate breathing and movement, yoga helps them to develop body awareness, self-control, and flexibity. Taking up yoga also helps them to focus and become better with daily routines. Start doing yoga by setting aside a regular time for it. Go slowly, listen to your body and don’t push it too far as yoga is not a competitive sport. Study each pose and practise it as you control your body and mind. Prepare well before each session: avoid tight clothing and a full stomach. An idea time to go yoga is before breakfast. A. Answer the following questions. 1. Where does yoga come from? …………………………………………………………………………………………………… 2. Who can do yoga? …………………………………………………………………………………………………… 3. Why should children do yoga too? …………………………………………………………………………………………………… 4. What do you learn when you do yoga? …………………………………………………………………………………………………… 5. How can you prepare for doing yoga? …………………………………………………………………………………………………… B. Decide the following suggestions are True or False according to the text. 1. It’s important that you do yoga regularly. _____ 2. If your body says “stop”, you should stop and don’t push it. _____ 3. You don’t need to understand well the pose you are practising. _____ 4. Yoga is competitive. _____ 5. The best time for doing yoga is the first thing in the morning. _____
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