gì vậy kết bạn với tớ ko

a ) Gọi d là ƯCLN( 21n + 4 ; 14n + 3 )

<=> 21n + 4 chia hết cho d

<=> 14n + 3 chia hết cho d

=> 14.( 21n + 4 ) chia hết cho d

=> 21.( 14n + 3 ) chia hết cho d

<=> [ 14.( 21n + 4 ) - 21.( 14n + 3 ) ] chia hết cho d

<=> [ ( 294n + 56 ) - ( 294n + 63) ] chia hết cho d

<=>   - 7 chia hết cho d => d = 1; 7

Vì 21n + 4 và 14n + 3 có ƯCLN là 1 ; 7

=> 21n + 4 / 14n + 3 không là phân số tối giản.

today teenager have .much. more money and expensive

1. The dictionary is 200,000dong.

................How much is the dictionary ?...............................................................................................................................

2. She bought it at the shop over there.

..................where did she buy it ?..............................................................................................................................

3. It took her three hours to finish the composition.

............................How long did it take her to finish the composition ?

....................................................................................................................

6. I need a phone card to phone my parents.

.....................................Why do you need a phone card ?...........................................................................................................

7. It’s about 1,500 km from Hue to Ho Chi Minh City.

......................how far is it from hue to hcm city ?..........................................................................................................................

8. The bank is opposite the restaurant.

.........................where is the bank ?.......................................................................................................................

9. The dress looked very nice.

..........................what did your dress look like ?......................................................................................................................

10. I saw her last night.

....................................when did you see her ?............................................................................................................

11. Her neighbor gave her a nice dress.

........................what did her neighbor give her ?........................................................................................................................

12. They returned to America two weeks ago.
........................when did they return to america ?........................................................................................................................

13. My father wasi in Ha Noi last month.

................................where was your father last month ?................................................................................................................

14. She went to the doctor because she was sick.

...............................why did she go to the doctor ?.................................................................................................................

15. Nam left home at 7 o'clock yesterday.

...................................what time did nam leave home yesterday ?.............................................................................................................

16. He taught English in the high school.

.......................what did he do in the high school ?.........................................................................................................................

17. She often does the housework after doing exercises.

.......................when does she often do her homework ?........................................................................................................................

18. They are planting some roses in the garden.

......................how many roses are they planting in the garden ?.........................................................................................................................

19. Liz will send these letters to her friends.

....................who will liz send these letters to ?............................................................................................................................

20. My favorite subject is Math.

...................what is your favorite subject ?.............................................................................................................................

21. She learns about computers in computer science class.

.......................what does she learn ebout in computer science class ?.........................................................................................................................

22. My mothers cooking in the kitchen at the moment.

............................what is your mother doing at the moment ?...................................................................................................................

23. Lan likes playing table tennis.

...............................what does lan like ?.................................................................................................................

24. I go to the movies twice a week.

.................how often do you go to the movies ?...............................................................................................................................

31. They go to the beach on the summer holidays.

..................phần gạch chân ?.............................................................................................................................

32. They stay in a hotel.

.............................phần gạch chân ?.............................................................................................................................................

00.I didn't forget it and neither did she->I remembered it and so did she.

0.She didn't tell you about that because she felt ashamed->Beacause of feeling ashamed, she didn't tell you about that.

1.you sleep much so you fell tired much->The more

you sleep. the more tired you will fell

2.the houses are small so they are cheap->The smaller the houses are, the cheaper they are

3.We study much,we love our country much->The more we study, the more we love our country

4I have never read such a romantic story->This is the most romantic story I have ever read.

5.they had never had such a cold winter->It was the coldest winter they had ever had

6.turn off all switches before leaving the workshop->all the swiches should be turned off before sleaving the workshop.

7.They can cost a lot of money->That can be costly

8.the old man had a few friends->The old man didn't have many friends.

9During the dinner the phone rang->While I was having dinner, the phone rang.

10.Is this your car?->Do you own this car ?

11.She started to give up smoking last year->She has given up smoking since last year.

12.He hasn't seen her for fifteen years now->He last saw her 15 years ago.

13.The boy is sorry,he's not a doctor->The boy wishes he were a doctor

14."I'm very busy,I'll ring you tomorrow"Su said to me->Su said to me that she was very busy and she would ring me the next day

15.She isn't used to getting up early in the morning->She doesn't get up early in the morning.

16.Noone is as intelligent as Mi in my class->Mi is the most intelligent student in my class

17.We have never seen that man here before->This is the first time we have seen that man

18.He is too old to have more children->He is so old that he can't have more children

19.We couldn't go to school this morning because of the heavy rain->Because it rained heavily, we couldn't go to school this morning

Rewrite the sentences as directed
1. Because I ate lots of sweets, I had a toothache (so)

I ate lots of sweets, so I had a toothache
2.It rained heavily but I went to school on time (although)

Although it rained heavily, I went to school on time,
3.She's sad because she fails her test (so)

She fails her test, so she's sad.
4.Although I like soccer,I don't have time to play it (but)

I like soccer but I don't have time to play it.

2^4=16

tick tớ nhé truong thi thanh tuyen

V Hoàn thành câu với từ gợi ý

Mẫu There / not be / milk -> There isn't any milk

1 there / be /water / cup

There is some water in the cup.

2 He / like / drink / iced coffee ?

Does he like drinking iced coffee ?

3 She / not buy / tomatoes / her meal

She doesn't buy tomatoes for her meal.

4 My teacher / have / big house / next park

My teacher has a big house next to the park.

5 They have / lunch / now

They are having lunch now.

6 I / want / glass/ beer / now

I want a glass of beer now.

7 You / like orange juice , please

Would you like some orange juice , please ?

8 How milk / you / want

How much milk do you want ?

thi co loi giai nay phep tinh va dap so the thui con thi nhan minh nha