(5x³-x²+2x-3)(4x²-x+2)

= 20x⁵-5x⁴+10x³-4x⁴+x³-2x²+8x³-2x²+4x-12x²+3x-6

= 20x⁵ - 9x⁴ + 19x³ - 16x² + 7x - 6

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Vì : Sống trong môi trường đất ngập nước có nhiều ốc nhỏ là vật chủ trung gian của sán lá gan. Với lại trâu bò nước ta ăn cỏ ngoài thiên nhiên nên có nhiều kén sán

12.watering

13.to become

16.to leave

17.play

18.to reach

24.seeing

26.was doing

28.to walk

29.will be given

34.Have..done

35.recognizing

38.is being built

40.Is...being repaired

43.to give

51. reads

52. does

54. clean

55. Was..repaired

56. is ... cleaned

61. to not miss

62. to pass

65. had had

66.would visit

69.knew

70.was

Bài 1:

5x + 2(3-x) = 27

<=> 5x + 6 - 2x = 27

<=> 3x = 21

<=> x = 7

1. Không thấy rõ

2. They decorated the Christmas trees and put at the font door.

3. Something must be done for these poor men

4. Did the novel " Martin Idon " written by Jack London?

5. They are going to build a new supermarket next year.

6. A new church has just been built near my house by them.

7. French and English are spoken in Canada

8. The telephone was invented in 1876 by Bell.

9. He is said to be the best doctor.

10. New Arts Gallery will exhibit his painting for the first time.

1. What's your name? Your name is Phong

=> Your -> My

2. What is he name? He name is Tam

=> He -> his

3. How many chair there are in your house?

=> chair there are -> chairs are there

4.What do your father do? My sister is a engineer

=> do -> does ; a -> an

5. They are a nurse

=> a -> an