a) \(\left|10x+7\right|< 37\)

\(\Rightarrow-37< 10x+7< 37\)

\(\Rightarrow-4,4< x< 3\)

b) \(A=\left(x-y\right)+\left|x+y\right|\)

TH1: \(\left(x+y\right)< 0\)

\(\Rightarrow x-y-x-y=-2y⋮2\)

TH2: \(\left(x+y\right)\ge0\)

\(\Rightarrow x-y+x+y=2x⋮2\)

Vậy:...

~~~REVISION UNIT 1 – 6~~~

Bài 1: A. Chọn từ có phần gạch chân được phát âm khác:

1. A. home B. know C. sport D. go

2. A. beach B. sea C. great D. read

3. A. study B. fun C. busy D. Sunday

4. A. pretty B. centre C. went D. else

5. A. twice B. birthday C. seaside D. quiet

B. Chọn từ có trọng âm khác so với các từ còn lại:

6. A. invite B. island C. enjoy D. address

7. A. tomorrow B. countryside C. yesterday D. sandcastle

8. A. party B. present C. tower D. explore

9. A. Science B. study C. today D. visit

10. A. holiday B. Vietnamese C. underground D. library

Bài 3: Chọn câu trả lời phù hợp cho câu hỏi ở cột bên trái:

18. What do you do in the evening?

f. I usually do my homework.

19. How did you go to Hue?

h. I went by train.

20. Did you join the sports festival?

i. No, I didn’t. I went to the zoo.

21. Where does she live?

a. She lives in Da Nang City.

22. Do you have school today?

k. Yes, I do.

23. What’s your city like?

c. It’s big and busy.

24. How often do you go fishing?

l. Once a month.

25. Where did you go last summer?

b. We went to Phu Quoc Island.

26. What did you do at the party?

d. We played hide-and-seek.

27. What will you do at the beach?

e. I will swim in the sea.

28. What lessons does he have today?

g. He has Maths, English and IT

Bài 4: Mỗi câu sau có 1 lỗi sai, em hãy tìm và sửa lỗi sai đó:

29. Did he invited you to his birthday party? => invite

30. They will build sandcastles in the beach. => on

31. How did you get there? – I went on underground. => underground

32. We took a lot of photo at the party. => photos

33. She often go swimming with her friends at the weekend. => goes

34. I always have big breakfast before I go to school. => a big breakfast

35. She lives in her grandparents in a small village. => with

Bài 5: A. Đọc đoạn văn, điền từ còn thiếu:

homework floor will Province times

visited with three Primary in

My name is Giang. I’m in Class 5B, Dong Da (36) Primary School. I live with my parents and my sister in Nam Dinh (37) Province. My address is Flat 11, the third (38) floor of Nam Dinh Tower. My city is big, crowded but pretty.

I go to school from Monday morning to Friday morning. In the afternoon, I usually do my (39)homework_. Sometimes, I go to the library (40) with my friends. In the evening, I go to English Club on Monday, Thursday and Sunday. I have (41) three lessons today: Vietnamese, English and PE. My favorite subject is Vietnamese. I have it four (42) times a week.

Last summer, I went to Ha Noi with my uncle. We (43) visited Ho Chi Minh Mausoleum, Hoan Kiem Lake, Dong Xuan Market and Long Bien Bridge. We took a lot of photos.

Next summer, my family (44) will go to Ha Long Bay. We may explore the caves and swim (45) in the sea. We will have a lot of fun.

B. Các câu sau là đúng hay sai, sửa lại câu sai:

46. __F__ Giang lives with her grandparents.

=> Giang lives with her parents

47. __T__ She lives on the third floor of a tower.

48. __T__ She doesn’t go to school on Saturday and Sunday.

49. __F__ She goes to English Club twice a week.

=> She goes to English Club three times a week.

50. __F__ She has Science today.

=> She doesn't have Science today.

51. __T__ She and her uncle went to Ha Noi last summer.

52. __T__ Her family may explore the caves at Ha Long Bay.

Bài 6: Sắp xếp lại các từ sau thành câu hoàn chỉnh:

53. his/ crowded/ parents/ He/ in/ with/ lives/ a/ town/ .

=> He lives in a crowded town with his parents.

54. in/ I/ dinner/ the/ cook/ often/ afternoon/ .

=> I often cook dinner in the afternoon.

55. study/ I/ a/ twice/ with/ week/ partner/ a/ .

=> We study with a partner twice a week.

56. did/ go/ she/ Where/ summer/ last/ ?

=> Where did she go last summer?

57. you/ Why/ stay/ will/ at/ tomorrow/ home/ ?

=> Why will you stay at home tomorrow?

58. think/ and/ Mum/ sunbathe/ will/ Dad/ I/ .

=> I think Mum and Dad will sunbathe.

b) \(M=\frac{\sqrt{x}-1}{2}\) . Có: \(\sqrt{x}-1\ge-1\) . Để M có giá trị nguyên thì \(\left(\sqrt{x}-1\right)⋮2\Rightarrow\sqrt{x}-1\) là số chẵn suy ra \(\sqrt{x}\) là số lẻ \(\left(x\ge0\right)\) => x cũng là số lẻ

Theo bài ra: \(x< 50\) mà \(\sqrt{x}\in N\)

\(\Rightarrow x\in\left\{1;9;25;49\right\}\)

Viết lại các câu sau sao cho nghĩa không thay đổi :

1) I am intersested in telling jokes.

-> I enjoy telling jokes.

2.She went out , but she didn't say a word.

-> she went out without saying a word.

3. Does it take you 3 hours to do this task ?

-> Do you spend 3 hours doing this task?

4. Remember to turn off the lights when you leave .

-> Don't forget to turn off the lights when you leave.

5. She enjoys giong swimming

-> she is interested in going swimming

6. Jack dislikes traveling by plane.

-> Jack isn't keen on traveling by plain.

7. I needed a drink of water so I stopped running

-> I stopped running in order to drink water.

8. T think it would be a good idea to take the train

-> I suggest taking the train.

Thế dung làm được không? :|

8) Tìm và sửa lỗi các câu sai:

1. Thanh go to school by car.

go => goes.

2. Miss Lan walks to his office.

his => her.

3. He wash his face every morning.

wash => washes

4. They live at the city.

at => in

5. What's your name? Your name is Vy.

Your => My

6. Are your house old?

Are => Is

7. How do Mr Tan travel to work? With bus.

do => does

With => By

8. Its six past twenty.

Its => It's

six past twenty => twenty past six

9. What the time?

What => What's

10. There's eraser at the box.

at => in

eraser => an eraser

Đi đâu cũng gặp phần tử khoe ảnh
 

Câu 1 bài 2 sai ở weigh nữa nhé. Sửa thành weight => danh từ.

a) Có \(A=\frac{\sqrt{x}+2}{\sqrt{x}-2}=\frac{\sqrt{x}-2+4}{\sqrt{x}-2}=\frac{\sqrt{x}-2}{\sqrt{x}-2}+\frac{4}{\sqrt{x}-2}=1+\frac{4}{\sqrt{x}-2}\)

Để A đạt giá trị nguyên thì: \(\sqrt{x}-2\in U\left(4\right)\)

TH1: \(\sqrt{x}-2=1\Rightarrow x=9\)

TH2: \(\sqrt{x}-2=-1\Rightarrow x=1\)

TH3: \(\sqrt{x}-2=2\Rightarrow x=16\)

TH4: \(\sqrt{x}-2=-2\Rightarrow x=0\)

TH5: \(\sqrt{x}-2=4\Rightarrow x=36\)

TH6: \(\sqrt{x}-2=-4\Rightarrow\) k tồn tại x

Vậy:...