4x+ 18=0

<=> 4x=-18

<=>x=\(\dfrac{-18}{4}=\dfrac{-9}{2}\)

\(\dfrac{15}{25}=\dfrac{3}{5}\)

hình như là không phải mình nghĩ vậy ^^ 

3-(5x-4)=-12

<=> 3-5x+4=-12

<=> -5x= -12-3-4

<=> -5x= -19

<=> x=\(\dfrac{19}{5}\)

\(\dfrac{1}{2}\)

\(\dfrac{3}{5}\)

\(\dfrac{18}{24}=\dfrac{3}{4}\)

VD.\(\dfrac{2}{7}\),\(\dfrac{4}{5}\)

1. does ..... go

2. Does ... do

3. don't play

4. do ... start - start

5.don't have

6.takes

7.are reading

8.Do ... brush

9.is talking 

10.are .... going

11. doesn't like

12.Do ... play

13.read

14.are going to go

15.is talking

16. teaches

17.am not reading

18.Did ,, buy

19.write

20.will fly

21.am working

22.began

23.go

24,is setting

25 sets

Câu IX. Hoàn chỉnh câu thứ hai sao cho không thay đổi nghĩa so với câu đã cho. (1,2 điểm)

45. They built a new school in our village last year.

→ A new school ……was built in our village last year……………………………………………………………………..

46. “Are you playing chess with your father now?” asked John.

→ John asked ……me if I was playing chess with my father now……………………………………………………………………….

47. Go to the nearest bookstore, and you can easily buy one.

→ If …you go to the nearest bookstore, you can easily buy one……………………………………………………………………………………

48. It's nearly 20 years since my father saw his brother.

→ My father hasn’t ……seen his brother for 20 years……………………………………………………………………………

49. She becomes a more graceful dancer than all of us.

→ She can dance …more gracefully than all of us………………………………………………………………………………

50. Although she performed well, she didn’t receive good comments.

→ Despite.....her good performance, she didn't receive good comments...............................................................................................................................

\(\dfrac{1}{2}\)

\(\dfrac{3}{5}\)

\(\dfrac{18}{24}=\dfrac{3}{4}\)