8 848 giây = giờ phút giâ

cho a,b,c là các số nguyên dương sao cho mỗi số nhỏ hơn tổng của hai số kia. Chứng minh rằng: a/b+c + b/c+a + c/b+a < 2

Một người đi xe đạp 18 phút được 3km. hỏi đi được 156 phút có bn km

Question1: She's doing a comparative study of health in inner cities and rural areas. A. urban B. coastal C. mountainous D. suburban Question2: Police are searching the area in the hope of finding the missing boy A. anxiety B. despair C. ambition D. expectation Question3: I find it hard to write …………… time pressure. A. down B. under C. with D. on Question4: The campaign has certainly succeeded in ……… public awareness of the issue. A. raising B. lifting C. rising D. picking up Question5: Every advanced nation has strict regulations to protect endangered ………….. A. species B. class C. group D. type Question6: ……………, ingenuity and flair are the song writer’s real talents. A. Creation B. Creative C. Creativity D. Creativeness Question7: Even a low level of noise interferes …………… my concentration. A. off B. on C. in D. with Question8: Not only …………… give you the experience of meeting a number of very interesting personalities, it will also take you to many interesting places. A. do reading these stories B. will reading these stories C. these stories will D. reading these stories Question9: They got …………… the bus in Obdland Village and walked up the road. A. out B. in C. on D. off Question10: There’s increasing demand for cars which are more ……………… A. economic B. economics C. economical D. economy Question11: I have …………… with most of my secondary school friends. A. conversation B. contact C. connection D. communication Question12:When the company has to close because of economic difficulties,he becomes... A. redundant B. inconsiderable C. unsatisfactory D. deliberate Question13:-“Those students will perform the annual school play.” -“Yes, it is …next week” A. due B. put on C. time-tabled D. scheduled Question14: It’s a long journey by train, it’s much ……….. by road. A. more quickly B. more quick C. quickly D. quicker Question15: Only ………. research has been carried out in this field. A. a few B. few C. not much D. a little Question16: Do you ………... my turning the television on now? A. mind B. want C. object D. disapprove Question17: I don’t like doing the ……….. , especially cleaning the windows. A. homework B. occupation C. housework D. jobs Question18: She asked me ………… speak Russian A. I can B. if I could C. I could D. if I can Question19 You can’t speak Russian. …………. A. Either I can B. Neither can’t I C. Neither can I D. I can’t neither Question20: Your car is very ………. . It hardly uses any petrol at all. A. ecological B. economical C. saving D. economic

Cứu đii mn lẹ điiiiiiii 2 phút nữa á

Làm hộ mình ý b) phần 2. Xin cảm ơn.

Cho phương trình x2 - (2m - 1)x + m2 – 1 = 0 (m là tham số), m nhận giá trị bằng bao nhiêu để phương trình có hai nghiệm phân biệt x1; x2, với x1< x2 thoả mãn (x1 – x2)2 = x1 – 3x2: A. m = ; B. m = -1; C. m = 1; D. m = 0.

thái bình có bao nhiêu vị đỗ đại sư a 108 b 109 c 110 d 111

. Put the verbs into the correct tense (simple past or present perfect simple). 1. A: I (cycle / just) 50 km. 2. B: I (cycle) 100 km last week. 3. A: I (write) an essay yesterday. 4. B: I (write / already) two essays this term. 5. A: I (ring / just) my friend. 6. B: I (ring) my friend 10 minutes ago. 7. A: Two days ago, I (watch) a Madonna concert on TV. 8. B: I (see / already) Madonna live in concert. 9. A: I (spend) my summer holiday in Australia last year. 10. B: I (be / not) to Australia yet

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