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1 tháng 6 2019

\(a,n^2+3⋮n-1\)

\(\Rightarrow n\left(n-1\right)+3+n⋮n-1\)

\(\Rightarrow n+3⋮n-1\)

\(\Rightarrow n-1+4⋮n-1\)

\(\Rightarrow4⋮n-1\)

...........You make the table, If i make the table, it will spent my times

That is answer:6 intergers

\(b,A=4+2^2+2^3+...+2^{20}\)

Put \(B=2^2+2^3+...+2^{20}\)

\(\Rightarrow2B=2^3+2^4+...+2^{21}\)

\(\Rightarrow2B-B=\left(2^3+2^4+...+2^{21}\right)-\left(2^2+2^3+...+2^{20}\right)\)\(\Rightarrow B=2^{21}-4\)

`\(\Rightarrow A=2^{21}-4+4=2^{21}\)

c,Consider the range of values

Put B=2.4.6.8...48

Because of B=2.4.6...10....48

=> The last digit of B is 0

Put C=1.3.5...49

Because of C= 1.3.5...49

=> The last digit of C is 5

=> B-C will have the last digit is 5

=> A have the last digit ís 5

21 tháng 10 2018

các bạn hãy làm hết 7 câu trên lưu ý là nó hơi dài 1 chút

21 tháng 10 2018

1. Cá hồi.

2. Tương ớt.

3. Đại dương.

4. Hãy làm như sau bằng tiếng Anh: Giả sử có tất cả các số có 5 chữ số để sửa kết thúc là 4 và số đó chia hết cho 3 (giải quyết theo 3 cách).

5. Giới thiệu bản thân bằng tiếng Anh.

6. Có bao nhiêu dân tộc ở nước ta?

7. Việt Nam được xếp vào múi giờ trên trục tưởng tượng.

Bạn không thể sử dụng google dịch.

Study well !!

21 tháng 12 2016

Một vài số khác nhau đã được viết trên bảng.Có hai số chia hết cho 3 và 9 trong số đó chia hết cho 13. Cho M là số lớn nhất trong các số đó. Số nhỏ nhất có thể là M?

10 tháng 10 2016

1. buiding/ tallest/ the/ is/ that/ city/ the/ in/ .

=> That building is the tallest in the city .

2. dinner/ much/ want/ for/ does/ how/ mother/ the/ milk/ your/ ?

=> How much milk does your mother want for the dinner ?

3. are/ in/ water/ there/ kitchen/ any/ of/ the/ bottles/ ?

=> Are there any water of bottles in the kitchen ?

4. classroom/ twenty/ floor/ desks/ Mai's/ the/ and/ has/ on/ is/ fifth/ it/ .

=> Mai's classroom has twenty desks and the fifth the floor is on it . 

 

5. we/ this/ a/ weekend/ camping/ change/ don't/ for/ why/ go/ ?

=> Why don't we go camping for a change this weekend ?

 

9 tháng 10 2016
  1. That building is the tallest in the city.
  2. How much milk does your mother want for dinner?
  3. Are there any bottles of water in the kitchen?
  4. Mai's classroom has twenty desks and it is on the fifth floor.
  5. Why don't we change go a camping this weekend?
SECTION 5: WRITINGXII. Rewrite each of the following sentences in such a way that it means the same as the first one. (2.0 points) 1.  How many teachers are there in your school?- How many teachers ……………………………………………………………2.  The toy store is to the right of the bakery.- The bakery ……………………………………3.  Do you and your friends walk to school every day?- Do you and your friends go…………………………………………4.  We have English class at 7.15.- Our English class……………………………………5.  Let us go to the beach and have a...
Đọc tiếp

SECTION 5: WRITING

XII. Rewrite each of the following sentences in such a way that it means the same as the first one. (2.0 points)

1.  How many teachers are there in your school?

- How many teachers ……………………………………………………………

2.  The toy store is to the right of the bakery.

- The bakery ……………………………………

3.  Do you and your friends walk to school every day?

- Do you and your friends go…………………………………………

4.  We have English class at 7.15.

- Our English class……………………………………

5.  Let us go to the beach and have a good time there.

 -How about…………………………………………………….

6. Is there a colorful picture in your room?

Does …………………………………………………..

7. How much is a bowl of noodles?

What ……………………………………………………

8. I have a brother and two sisters.

-> I have three……………………………………….

9. I spend two hours a day doing my homework.

-> It ……………………………………………………………………….

10. No one in my class is as lazy as Tom.

-> Tom …………………………………………………

11. Andrew went to the supermarket despite the heavy rain

→ Although ..................................................................................

12. That is the best meal I have ever eaten.

I have never................................................................................

3
20 tháng 2 2022

1How many teachers does your school have?                     

2. The bakery is to the left of the toy store.

3. Do you and your friends go to school on foot every day?

4. Our English class starts at 7.15.

5. How about going to the beach and having a good time there?

6. Does your room have a colorful picture?

7. What is the price of a bowl of noodles?

8. What is the height of the Mount Everest?

9. It takes me two hours a day to do my homework.

10. Tom is the laziest (student/ boy) in my class
11. Although it rained heavily / the rain was heavy, Andrew went to the supermarket.

12.I have never eaten such a good meal before/ a better meal than that.

mấy câu kia ở đâu v bn?:)

IX. Supply the correct form of the words in parentheses. 1.      What is the (high)……………of that mountain? – About 2000 meters. 2.      How many (child)……………..do you have, Mr. Nam? 3.      Lan is the (small)……………………of the three girls. 4.      Jane is the (young)………………of the two girls. 5.      There are ten (bookshelf)…………………….in the library. 6.      The country is (quiet)…………….than the city. 7.      Which color do you like (good)…………….? 8.      We must (take) ………..an umbrella. It...
Đọc tiếp

IX. Supply the correct form of the words in parentheses.

1.      What is the (high)……………of that mountain? – About 2000 meters.

2.      How many (child)……………..do you have, Mr. Nam?

3.      Lan is the (small)……………………of the three girls.

4.      Jane is the (young)………………of the two girls.

5.      There are ten (bookshelf)…………………….in the library.

6.      The country is (quiet)…………….than the city.

7.      Which color do you like (good)…………….?

8.      We must (take) ………..an umbrella. It (rain)……………..

9.      Nga doesn’t like (China)………………..food.

10.  The weather is becoming (cold)………………

11.  We must be (care)........................... when we cross the  road.                              

12.  This tree has a lot of green  (leaf)....................................                                     

13.   Is your father a  (business).............................?                                        

14.   I’m Vietnamese. What’s your (nation)......................................?                         

15.  Air (pollute)......................... is a big problem in many cities in the world.           

16.  The photocopy is between the (bake)..........................and the drugstore.         

17.  Is your brother an (act).........................................?                                              

18.  Mai's sister is a  (sing).......................................

19.   Yoko is from Japan. She is  (Japan)................................

20.   She is (beautiful)……………………than her sister.

1
2 tháng 4 2023

1. height 

2. Children

3. Smallest

4. younger

5. bookshelves

6. quieter 

7. Best 

8. take/is raining

9. Chinese

10. colder

11. careful

12. leaves

13. businessman

14. nationality

15. pollution 

16. bakery

17. actor

18. singer

19. Japanese 

20. more beautiful

 

T.i.c.k cho mình nha, cảm ơn

4 tháng 3 2022

1spent

2is shining

3has

4are-Is it raining?

5to live

6taking

4 tháng 3 2022

Bạn chắc không ạ ?

Bài.Viết câu hỏi cho phần gạch chân 1.The sovenir shop is in front of the book store. Gạch chân in front of the book store 2.We go to buy train Gạch chân by train 3.I would like to buy some postcards Gạch chân some postcards 4.She has English three times a week Gạch chân three times a week 5.I went to Nha Trang last month. Gạch chân last month 6.I buy a phone card because i want to call my parents Gạch chân because i want to call my parents Bài 2.Đọc đoạn...
Đọc tiếp

Bài.Viết câu hỏi cho phần gạch chân

1.The sovenir shop is in front of the book store. Gạch chân in front of the book store

2.We go to buy train

Gạch chân by train

3.I would like to buy some postcards

Gạch chân some postcards

4.She has English three times a week

Gạch chân three times a week

5.I went to Nha Trang last month.

Gạch chân last month

6.I buy a phone card because i want to call my parents

Gạch chân because i want to call my parents

Bài 2.Đọc đoạn văn và trả lời câu hỏi

Lan went to Nha Trang with her family on vacation last month.She stayed at a hotel on the side of the beach.In the early morning,she went to the sea and swam for an hour.Then she had breakfast in a foodstall on the beach to enjoy fresh air in the morning.In the afternoon,she took some photos of the sights.She stayed in Nha Trang for four days and took a lot of nice photos.She also bought some postcards and souvennir for her friends.It was a great vacation because she had a lot of fun.

1.Where did Lan go on vacation last month?

2.What did she do in the early morning?

3.What did she do in the afternoon?

4.How long did she stay in Nha Trang?

5.Why was her vacation great?

2
23 tháng 5 2020

đúng lúc cần c.mơn bn nha

23 tháng 5 2020

Bài.Viết câu hỏi cho phần gạch chân

1.The sovenir shop is in front of the book store. Gạch chân in front of the book store

=> Where is the souvenir shop ?

2.We go to by train

Gạch chân by train

=> How do we go to ?

3.I would like to buy some postcards

Gạch chân some postcards

=> Waht would you like to buy ?

4.She has English three times a week

Gạch chân three times a week

=> How often does she have English ?

5.I went to Nha Trang last month.

Gạch chân last month

=> When did you go to Nha Trang?

6.I buy a phone card because i want to call my parents

Gạch chân because i want to call my parents

=> Why do you buy a phone ?

Bài 2.Đọc đoạn văn và trả lời câu hỏi

Lan went to Nha Trang with her family on vacation last month.She stayed at a hotel on the side of the beach.In the early morning,she went to the sea and swam for an hour.Then she had breakfast in a foodstall on the beach to enjoy fresh air in the morning.In the afternoon,she took some photos of the sights.She stayed in Nha Trang for four days and took a lot of nice photos.She also bought some postcards and souvennir for her friends.It was a great vacation because she had a lot of fun.

1.Where did Lan go on vacation last month?

=> Lan went to Nha Trang with her family on vacation last month.

2.What did she do in the early morning?

=> In the early morning,she went to the sea and swam for an hour

3.What did she do in the afternoon?

=> In the afternoon,she took some photos of the sights

4.How long did she stay in Nha Trang?

=> She stayed in Nha Trang for four days

5.Why was her vacation great?

=> It was a great vacation because she had a lot of fun.

18 tháng 10 2023

Vãi There are a total of $8\times 7\times 6\times 5\times 4=67,\!200$ ways to form a 5-digit number with distinct digits out of 0, 1, 2, 3, 4, 5, 6, 7. We claim that these can be grouped into $\binom{5}{2}\cdot 2=20$ pairs, where each pair adds up to 7777. The pairs are $(0, 7777), (1, 7776), \ldots, (4, 7773)$ and $(5, 7772), \ldots, (7, 7770)$. Thus, the sum of all the possible numbers is $20\cdot 7777=\boxed{155,540}.$ đó ko biết đúng hay sai nhé

18 tháng 10 2023

ULTR làm mà ko biết đúng hay saiha

6 tháng 2 2022

1. When did your father start to do judo?

=> How long is .......your father started doing judo?.............

2. We haven't eaten durians for 4 years.

=> The last time .........I eat durians was 4 years ago...........

3. Nam plays soccer better than Tuan.

=> Tuan doesn't ..........play soccer as well as Nam...........

4. Mrs. Tuyet has never visited Hue before.

=> This is ........the first time Mrs Tuyet has ever visited Hue.........

5. Mi started playing piano 2 years ago       (has)

=> .....Mi has played pianno for 2 years....

6. Does Phong's school have fifteen classrooms        (there)

=> .......Are there 15 classrooms in P's school?.....

7. Phanxipang is 3.143 meters. Mount Everest is 8.848 meters          (much)

=> ......Mount E much taller than Phanxipang mount.....

6 tháng 2 2022

1. How long has your father done judo?

2.The last time we ate durians was 4 years ago.

3. Tuan doesn't play soccer as well as Nam.

4. This is the first time Mrs. Tuyet has visited Hue.

5.I have played the piano for two years

6. Are there forty classrooms in Phong's school ?

7.Everest is taller than Mount Phanxipang