May be, after school I sit besides my computer and chat with my fiends on Hoc24h. But sometimes, the sky has cloud, I go outside and play badminton with my classmates

C1 Four thirty

C2 Haft past four

@thân@

38. I (love)____love_______ cats, but I (not love)___don't love______dogs.

39. Everyday ,I (go)_____go____to school on foot, but today I (go)____go_____to school by bike.

40. Who are you ______waiting___________(wait) for Nam?

- No, I ______am waiting_________________(wait) for Mr. Hai.

41. My sister (get)______gets________ dressed and (brush)____brushes_______her teeth herself at 6.30 everyday.

42. Mrs. Smith (not live)__doesn't live____in downtown. She (rent)_ rents______in an appartment in the suburb.

43. How ___do______your children (go)_______go__________to school everyday?

44. It's 9 o'clock in the morning. Lien (be)___is_____in her room. She (listen) ______is listening_________to music.

45. We________are playing_______________(play) soccer in the yard now.

46. My father (go)______goes_____ to work by bike. Sometimes he(walk)___walk___________.

47. _____Do____You (live)__live______near a market? _Is It (be)____________noisy?

48. Now I (do)_____am cooking ________the cooking while Hoa (listen)___listening____________to music.

49. At the moment, Nam and his friends (go)___are going to_____shopping at the mall.

50. In the autumn, I rarely (go)______goes________sailing and (go)____goes______to school.

51. I (write)______am writng_____ a letter to my friend now.

52. At 12 a.m every day, I (have)____have__________lunch and (go)______go______to bed.

53. On Monday, I (have)________have________________ math and Art.

54. On Friday, I (have)________have______________English.

55. At the moment, I (eat)____am eating_____an orange, and My sisters (Play)___is playing____ Tennis.

56. ____Are___her bags (be)?

- No, they(not be)____aren't__________.

57. What time ___do__________your children (go)_____go_______ to school?

58. He (live)_______lives_________in HCM City.

59. What time____does____your brother usually (get)____get_______up?

60. My house (be)__is_______in the city and it (be)____is_____small.

61. Every morning , we (have)__have________breakfast at 7.00 am.

62. This (be)_____is___a book and there (be)______are___pens.

63. Mr. Quang (live)____lives____in the countryside. He (have)____has______a big garden.

64. John (not have)___doesn't have_______Literature lesson on Friday.

65. What time ____do_____you (start)___start________your class?

66. _______Are____you (be) in class 12A3?

67. Mrs. Ha (learn)________learns__________in Hanoi, but she (not live)_____doesn't live__________ there.

68. My brother (not live )_____doesn't live_________in London; he (live) ______lives_________ in Manchester.

A

A

Gọi số xe lúc đầu là x  (xe) (x > 1)

Số tấn hàng mỗi xe phải chở theo dự định là: $\frac{21}{x}$21x  21/xtấn

Thực tế có (x - 1) xe => Mỗi xe phải chở : $\frac{21}{x-1}$21x−1  21/x-1 tấn

Theo bài cho : Mỗi xe chở thêm so vơi dự định là 0,5 tấn nên ta có phương trình:

$\frac{21}{x-1}$21x−1   $\frac{21}{x}$21x  21/x-1=21/x + 0,5 

=> 21x  = 21(x - 1) + 0,5x.(x - 1)

<=> 0,5x² - 0,5x - 21 = 0 

<=> x² - x - 42 = 0  <=> x² - 7x + 6x - 42 = 0 

<=> (x - 7).(x+6) = 0 <=> x = 7 hoặc x = - 6 (Loại)

Vậy có 7 xe lúc đầu

đẹp khủng khiếp , nhất là 2 cái má mũm mĩm

Số thứ nhất 375 
Số thứ hai 625.

MK NÈ