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11 tháng 10 2016

Đặt tích 3 số tự nhiên liên tiếp là A = a.(a+1)(a+2)

Để chứng minh A chia hết cho 2 có 2 trường hợp :

+) Nếu a chia hết cho 2 ( a chẵn ) => A chia hết cho 2 

+) Nếu A chia 2 dư 1 ( a lẻ ) => a+1 chia hết cho 2 => A chia hết cho 2 

Để chứng minh A chia hết cho 3 có 3 trường hợp :

+) Nếu A chia hết cho 3 => A chia hết cho 3 

+) Nếu A chia 3 dư 1 => a+2 chia hết cho 3 => A chia hết cho 3

+) Nếu A chia 3 dư 2 => a+1 chia hết cho 3 => A chia hết cho 3 

Mà 2 và 3 là 2 số nguyên tố cùng nhau nên :

A chia hết cho 6 hay 3 số tự nhiên liên tiếp chia hết cho 6

15 tháng 8 2016

tui lm ở link kia rồi

It helps me draw a circle

\(\Rightarrow\)It's a com - pass

Bạn phải ghi rõ đề bài ra chứ, ghi ra đi, mình chắc chắn mình sẽ giải mà, bạn cứ đăng câu hỏi hẳn hoi ra.

24 tháng 10 2018

sách mới hay sách cũ

1/ reads
2/ will phone
3/ make
4/ ask
5/ will pass
6/ is more modern
7/ more historic
8/ more terrible
9/ bigger
10/ more crowded

27 tháng 4 2022

Cảm ơn ! haha

24 tháng 3 2019

I. Choose one word whose underlined part is pronounced differently from the others.

1.

A. boots

B. toothpaste

C. food

D. flood

2.

A. watches

B. brushes

C. classes

D. lives

3.

A. their

B. math

C. thing

D. theater

4.

A. station

B. intersection

C. question

D. invitation

5.

A. teacher

B. children

C. lunch

D.chemist

6.

A. answer

B. travel

C. plane

D. bank

7.

A. teacher

B. repeat

C. year

D. meat

8.

A. warm

B. park

C. farm

D. car

9.

A. one

B. jog

C. box

D. doctor

10.

A. house

B. hour

C. country

D. mouse

II. Choose the best answer to complete the below sentences:

1. What’s .................. dinner? Ther is some rice and some meat.

A. at                B. in              C. for               D. on

2. There is ................... bread on the table.

A. an               B. a               C. some            D. two

3. What .................. your favorite food?

A. is                B. does             C. do                   D. are

4. I’m tired. I’d .....................

A. sit down            B. to sit down        C. sitting down            D. sit

5. When it’s hot, I’d .......................

A. iced coffee         B. ice coffee         C. coffee ice              D. coffee with ice

6. It’s twelve o’clock,Nam. Let’s ............... home.

A. go                 B. to go             C. going                D. goes

7. Tuan and I ................. badminton in the yard.

A. playing              B. is playing         C. are playing             D. am playing

8. We are going to visit our grandparents ................... one week.

A. at                  B. on             C. by                    D. for

9. ...................... weekends I often goto the countryside.

A. on                  B. in               C. for                  D. at

10. Does it rain ................. in Britain during the summer?

A. everytime             B. always           C. whole              D. all the time

11. Michael is the ............. member of the team.

A. younger              B. more young         C. youngest           D. most young

12. My brother feels ..................again after his illness.

A. strongly               B. strong             C. is strong            D. strength

13. What would you to drink? ......................

A. Thank you             B. Tea, please          C. Yes, please           D. No, I don’t

14. What part of the country are you .................?

A. of                     B. from                 C. by                  D. on

15. I don’t want much suger in my coffee. Just .............please.

A. little                    B. few               C. a few                  D. a little

16. - I’m very hungry.

- .........................

A. Also me                B. For me the same          C. Me, too           D. I also

17. This apple tastes ....................

A. sweetness             B. sweetly               C. sweety                D. sweet

18. Susan is the ..................... of the two girls.

A. prettier               B. prettiest               C. pretty              D. more pretty

19. - Can I help you?

- I’d ten ............ of soda, please.

A. packets               B. boxes                C. bars               D. cans

20. Many Asia animals are ............. danger.         

A. in                  B. on                  C. at                   D. of

III. Rewrite the following sentences in such way that the meaning is not changed.

1. Milk is Minh’s favorite drink.

Minh .....................................

2. The birthday cake is very big.

It’s ......................................

3. How much does that T- shirt cost?

How much .....................................

4. Hang is the fattest girl in my class.

No girl.........................................

5. Phong is their son.

They ...............................................

6. What is the height of that building?

How ...............................................

7. What about going for a swim? It’s very hot today.

Why ................................

8. Can I help you?

What ..................................?

9. Minh walks to school everyday.

Minh goes ...........................

10. There are four people in her family.

Her family .......................................

24 tháng 3 2019

I. Chọn từ có cách phát âm khác với các từ còn lại ở phần gạch chân. (1m)

1. a. raised

b. practised

c. talked

d. liked

2. a. catch

b. chat

c. watch

d. chemistry

3. a. weight

b. height

c. eight

d. ate

4. a. see

b. sit

c. sauce

d. pleasure

5. a. age

b. gate

c. guest

d. girl

6. a. hour

b. horrible

c. here

d. hundred

7. a. oranges

b. washes

c. watches

d. stores

8. a. sound

b. house

c. should

d. scout

9. a. early

b. first

c. near

d. learn

10. a. spoon

b. food

c. noon

d. flood

II. Cho dạng đúng của động từ trong ngoặc. (2ms)

1. When my brother and I (be).....................................................children, we (have).........................................................two cats and a dog.

2. It's 8.00 now. We (learn).............................................................math.

At 9.00, we (have).........................................................a history class.

3. Lien's brother is an architect but he (not work).............................at the moment.

4. How much it (cost)......................................... to mail a letter to England?

5. We are decorating our house because we (have).......................a birthday party tonight.

6. They (travel).................................................to the USA next month

7. Would you me (help)..............................you with your homework tonight?

8. My sister gets used to (go).....................................out on Saturday nights.

III. Chọn đáp án đúng để hoàn thành các câu sau. (1,5ms)

1. Playing chess after dinner sounds...................... to me.

A. boring           B. bored           C. boringly        D. boredom

2. We may know the land very well, but we know very................. about the oceans.

A. few              B. little               C. much        D. a little

3. I received a letter....................my friend yesterday.

A. from             B. by                C. on           D. at

4. As a child, he............................ his parents.

A. ought obey         B. ought obeying         C. ought to obey         D. ought to obeying

5. She needed..................................these postcards to her friends.

A. to send              B. sending             C. sent           D. sends

6. Hung and his brother............................. at home yesterday.

A. didn't are              B. wasn't             C. weren't         D. not were

7. She talked to her friends.............................her vacation in da lat.

A. about                 B. on                C. with           D. for

8. He caused an accident because he was driving too...........................

A. fastly                B. fast               C. very fast           D. much fast

9. Of all the students in my class, Nam is............................

A. tallest                B. taller               C. tall               D. the tallest

10........................... my next birthday.

A. I am 14 on             B. I will be 14th         C. I will be 14 on        D. I am going to be 14 on

11. Are there........................ for me this morning?

A. any letters               B. Letter               C. any letter            D. some letters

12. My father is a......................... football player.

A. skill                   B. skilled                C. skillfully            D. skillful

13. My sister doesn't want to drink coffee,and.........................

A. I do either               B. I do, too              C. so do I               D. neither do I

14. Tuan is a good student. He always answers the teacher's questions.........

A. quick                   B. quickly               C. too quick              D. very quick

15. Living in the city is.......................than in the countryside.

A. more noisy                 B. noisier              C. noisyer               D. less noisy

IV. Cho dạng đúng của từ trong ngoặc. (1m)

1. My sister has a big.....................................................of stamps. (Collect)

2. My favorite subject at school is physical........................................ (educate)

3. The most popular............................................at recess is talking. (act)

4. What a......................................................................picture! (wonder)

5. I live in a........................................................house by the sea. (Love)

6. My friend and I write to each other.............................................. (regular)

7. Guitar is a..............................................................instrument. (music)

8. I have............................................time to play than my friends do. (little)

9. You should do morning exercises to have a.................................body. (health)

10. Where is the.............................................................restaurant? (near)

V. Tìm và khoanh tròn lỗi sai trong mỗi câu sau. (1m)

Đề thi học sinh giỏi môn tiếng Anh lớp 7 có đáp án

VI. Viết lại câu sau sao cho ý nghĩa không đổi bắt đầu với từ đã cho. (2ms)

1. Do you have a cheaper computer than this?.

Is this...........................................................................................?

2. The new refrigerator is bigger than the old one.

The old refrigerator............................................................................

3. She is a good badminton player.

She plays..........................................................................................

4. My brother s playing soccer better than watching TV.

My brother prefers..............................................................................

5. We have a two-month summer vacation.

Our summer vacation lasts....................................................................

6. You shouldn't go there alone.

You had.....................................................................................

7. What is you daughter's age, Mrs Nga?

How........................................................................................?

8. I spend two hours doing my washing every day.

It takes........................................................................................

VII. Đọc đoạn văn sau.

A. Chọn từ thích hợp cho sẵn và điền vào chỗ trống, có 1 từ thừa (0,5ms)

becomes, events, live, programs, broadcasts, much

Nowadays, television 1................................ very popular. Both old and young people enjoy watching it very 2.................................... TV programs attract millions of viewers all around the world. In addition to the news, TV stations also broadcast many interesting 3................................... such as sports, music, cartoons,wildlife, popular science, reports, contests, movies, etc.

At present, people can enjoy a 4............................. program on TV. Live TV program helps us see events at the same time as they are happening. In our country, we often watch live TV programs of important 5.................................. and international football matches.

B. Trả lời các câu hỏi sau.(1m)

1. Who enjoy watching television?

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

2. What program helps us see events at the same time as they are happening?

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

3. What do we often watch in our country?

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

4. Do you have a television set at home?

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

5. Which programs on TV do you watching?

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

14 tháng 4 2023

Tham khảo

https://engbreaking.com/cac-thi-trong-tieng-anh/?utm_source=google&utm_medium=cpc&utm_campaign=03-goga-viet-search-info-campaign&utm_term=148250893912&utm_content=653250878560&gclid=EAIaIQobChMIlqDvk72p_gIV29tMAh3DTgGmEAAYASAAEgImovD_BwE

14 tháng 4 2023

Bạn tham khảo trên mạng là ra rất nhiều form đầy đủ, tra form của từng thì lần lượt thì sẽ đầy đủ kiến thức hơn nhé.

2 tháng 12 2018

- I to eat banh chung and not go school

* Hok tốt !

# Miu

18 tháng 10 2020

giúp mik với

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