1. D. carried

2. B.father

3. D.passage

4. A.whole

5. D.development

Tick cho mk nha Thank you so much

Để là phân số tối giản thì m phải không có bội chung và ước chung với

Ta biết: 15 = 3.5

Nên m khác 3k, 5k với k là số nguyên bất kì

Bạn tick hộ mk nha

Sông Lam bạn ak

Tên Tiếng Anh chắc là : Blue river

a) Ta xét tổng các chữ số của 20 192 019 là:

2 + 0 + 1 + 9 + 2 + 0 + 1 + 9 = 24 chia hết cho 3

Nên 20 192 019 chia hết cho 3 mà 20 192 019 > 3 nên 20 192 019 là hợp số

b) Ta biết: 10 chia 3 dư 1

Mà: UCLN(10,3) = 1 nên 10^8 và 10^7 đều chia 3 dư 1

Suy ra: 10^8+10^7+7 chia 3 dư 9 hay chia hết cho 3. Mà 10^8+10^7+7 > 3 nên 10^8+10^7+7 là hợp số.

c)

Ta biết: 10 chia 3 dư 1

Mà: UCLN(10,3) = 1 nên 10^100 chia 3 dư 1

Suy ra 10^100 - 7 chia 3 dư 6 hay chia hết cho 3

Mà 10^100 - 7 > 3 nên 10^100 - 7 là hợp số

Câu 1:

a) ( 3x - 2 )\(^2\) - ( 2x - 3 )\(^2\)

Áp dụng hằng đẳng thức a\(^2\) - b\(^2\) = (a-b)(a+b), ta có:

a) ( 3x - 2 )\(^2\) - ( 2x - 3 )\(^2\)

= ( 3x - 2 + 2x - 3 )( 3x - 2 - 2x + 3)

= ( 5x - 5 )( x + 1 )

= 5( x - 1 )( x + 1 )

b) 5x - 5xy - x + y

= 5x( x - y ) - ( x - y )

= ( 5x - 1 )( x - y )

c) 4a\(^2\) - 1 + 2ab + b

Áp dụng hằng đẳng thức a\(^2\) - b\(^2\) = (a-b)(a+b), ta có:

4a\(^2\) - 1 + 2ab + b

= 4a\(^2\) - 1 + b( 2a + 1 )

= ( 2a + 1 )( 2a - 1 ) + b( 2a + 1 )

=( 2a + b - 1 )( 2a + 1 )

Chuyển sang bị động

1. I finished my work at a about five o'clock

=>My work was finished at about five o'clock.

2. They gave him a nice present when he retired

=>He was given a nice preseny when he retired .

3. We opened the boxes and took out the cigarettes.

=>The boxes were opened and the cigarettes were taken out .

4. You must answer all the questions on the paper.

=>All the questions must be answered on the paper .

5. People will forget the whole incident after a few weeks. =>The whole incident will be forgotten after a few weeks .

6. People are talking about him everywhere.

=>He is being taken about everywhere.

7. You must plan your work carefully.

=>Your work must be planed carefully .

8. The didn't tell me all the details of the case.

=>l wasn't told all the details of the case.

9. They took him to hospital in an ambulance.

=>he was taken to hospital in an ambulance .

10. Someone has stolen my pen.

=>My pen has been stolen.

11. They have to repair the engine of the car.

=>The engine of the car has to be repaired.

12. The teacher is going to tell the story.

=>The story is going to be told by the teacher.

13. Mary is cutting the cake with a sharp knife.

=>The cake is being cut with a sharp knife.

14. They have provided the victim with food and clothing.

=>The victim has been provided with food and clothing .

15. Luckily for me, they didn't call my name.

=>Luckily for me, my name wasn't called

16. No one belives his story.

=>His story isn't believed.

17. People speaks English in almost every corner of the world.

=>English is spoken in almost every corner of the world .

18. Did the teacher give some exercises ?

=>Were some exercises given by the teacher?

19. How many games has the team played ?

=>How many games have they been played by the team?

20. Who wrote the letter ?

=>Whom the letter was written?

21. You must clean the wall before you plant it.

=>The wall must be cleaned before it is planted .

22. Weeds cover the river bank.

=>The river bank is covered by weeds

23. They will hold the meeting before May day.

=>The meeting Will be hold before May day.

24. I washed my clothes yesterday.

=>My clothes were washed yesterday .

25. He is asking me a lot of questions.

=>l am being asked a lot of questions.

26. My mother has made that cake.

=>That cake hay been mode by my mother.

27. Jond delivers the newspapers every morning.

=>The newspapers Are delivered by John every day .

28. They can't make tea with cold water.

=>Tea can't be made with cold water

III. Choose the best option.

20. I…………..out if I hadn’t been so tired.

a. will go b. went c. would have gone d. would go.

21. If I ………..a camera, I would have taken some pictures.

a. have b. had c. would have d. had had.

22. You won’t pass the examination……………you study more.

a. as long as b. unless c. if d. whether.

23. If only I …………you wanted to invest money in business.

a. had known b. knew c. have known d. know.

24. If I were to leave my country , I ……………disappointed.

a. probably be b. would have been c. will be d. would be.

25. If he hadn’t wasted too much time, he…………….in his examination.

a. would fail b. wouldn’t fail c. wouldn’t have failed. d. won’t fail.

26. If I had taken that English course, I ………..much progress.

a. had made b. would have made c. made d. would make.

Chúc bn học giỏi ^_^

1. When you call me last night, I was ( on / in / at / to )__________my room.

2. I have ( to ask / ask / asking / asks )_____________ my parents’ permission.

3. My teacher showed me how ( to pronounce/ prounouncing / pronounce ) English vocabulary.

4. My computer (hasn’t worked / didn’t work / works) a moment ago.

5. He works hard so as to ( get/ make/ do/ ) high marks.

6. Water cans can be ( recycled/ thrown away/ reused ) after being cleaned.

7. This is the first time I ( is reading / read/ have read) this novel.

8. These problems ( will be solved / will solve / solved) next week.

9. You can solve this problem ( with / by / in / from ) asking your partner.

10. Lan is interested ( of/ in / out / for ) listening English songs.

11. My computer ( hasn’t worked / work / working / works) since last week.

12. What about ( going / go / goes / to go ) to the exhibition ?

13. At 9 o’clock yesterday we ( are lying / have lain / lay /were lying )____________ on the beach

14. Ten countries participated in the discussions. ( took part in / held / went to / arranged )

15. Nga asked me ( whether if / if /what / if whether )__________ Big Ben was in London.

16. The essay ( was completed /has completed /complete /completed )_________by Nam three hours ago.

17. Would you mind ( if / when / that / how ) __________I borrowed your English book ?

18. Do you mind ( to close / closing / closed / closes )__________ the window ?

19. Do you mind if I ( take / took / taking / to take ) __________ a photo ?

20. ( Will / Do / Can / Should ) _________ you mind finishing the work yourself ?

Chúc bn học tốt, tick cho mk nha