Exercise 13 . Use the correct form of the word given each sentences

11.  The …………………………………………….…………… between team A and team B is very exciting (compete)

12. I want to go to the dance ……………………………………….………………………………… in New York (compete)

13.  She wants to be a good …………………………………………………………………………….. (dance)

14.  Trinh Cong Son is a famous Vietnamese ………………………………………………………………………… (music)

15.  Minh loves …………………………………………………………………..………….. coins (collect)

16. There was an ……………………………………………………..………… of paintings at the Art Gallery (exhibit)

17. AG Bell …………………………………………………………..…….…. the telephone in 19^th century (invention)

18. He was ……………………………………………………………………….. in demonstrating his invention (success)

19. The …………………………………………….……………….. of the telephone has changed our lives a lot (invent)

20. Don’t leave the light on. It wastes ……………………………………………………………….………. (electric)

Bài 2 : Tìm x (đưa về nhân tử)

f)         x(2x – 9) – 4x + 18 = 0

g)         4x(x – 1000) – x + 1000 = 0

h)        2x(x – 4) – 6x²(– x + 4) = 0

i)          2x(x – 3) + x² – 9 = 0

j)          9x – 6x² + x³ = 0

Câu 20 : Tính hóa trị của các nguyên tố

b) Cacbon trong CCl₄, CO, CO₂

c) Crom trong CrO, Cr₂O₃, CrCl₃

d) Nito trong NH₃, N₂O, N₂O₃

e) Sắt trong FeO, Fe₂O₃, FeCl₂

Exercise 13 . Use the correct form of the word given each sentences

1.    Erik is one of the most famous …………………………………………….………………………… in Vietnam (music)

2.    You must place these events in their ……………………………………………......……………….. context (history)

3.    Mai has a great coin …………………………………………………..………………….. (collect)

4.    My best friends have got ………………………………………………………………….. for 2 years (marry)

5.    ............................................................................, Vietnamese women usually wear the ao dai on their wedding day (tradition)

6.    I’ve got a lot of useful ………………………………………………………………………… (inform)

7.    I ……………………………………………………………………….. many beautiful stamps last year (collect)

8.    Traditional instruments are played by many different ………………………………………………………… groups around the world (culture)

9.    Over …………………………………………………………………….….. entered the race (compete)

10.  Women couldn’t choose their husbands and had to get ………………………..……………………………. at a very young age (marry)

Bài 1: Phân tích các đa thức sau thành nhân tử bằng phương pháp tách hạng tử:

a)2x³-5x²-7x

b)-x²-9x-18

c)6x²-7x+2

Bài 2: Tìm x (phương pháp bình thường)

a)(x+3)(x-1)-x(2x+7)=10

b)(x-4)(x+5)-x(x-11)=0

giúp em ạ❤