We use 8 digits 0, 1, 2, 3, 4, 5, 6, 7 to form...">
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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

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 !!

29 tháng 7 2018

223 nha bạn chắc chắn lun đó

cho mk 1 ik nha

29 tháng 7 2018

223 nha bạn chắc chắn lun đó

cho mk 1 ik nha

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?

29 tháng 11 2021

7,429 has 4 digits
it: 7, 4, 2, 9
264 has 3 digits
it: 2, 6, 4

29 tháng 7 2016

Our school(1) has  a lot of clubs and I belong to( 2) two of them: the drama group and( 3)the folk music club. In each( 4) club, you can find the same types of people. First, there is “ The Mouth”, Who can not stop talking. Then, (5) there is The Know it- all”, Who thinks that other people’s ideas(6) are Rubbish. There are also quiet types such as “ The”(7)and The Scribbler”. The Brain only speaks(8) when  she has to something to say. And “ The(9)Scribbler takes a lot of notes but rarely speaks. My favorite is “ The mouse”, who smiles( 10) a Lot and seems happy to do all those boring little jobs that everyone else avoids.

 

29 tháng 7 2016

Our school has  a lot of clubs and I belong to two of them: the drama group and the folk music club. In each club, you can find the same types of people. First, there is “ The Mouth”, Who can not stop talking. Then, there is The Know it- all”, Who thinks that other people’s ideas are Rubbish. There are also quiet types such as “ The” and The Scribbler”. The Brain only speaks when  she has to something to say. And “ The Scribbler takes a lot of notes but rarely speaks. My favorite is “ The mouse”, who smiles a Lot and seems happy to do all those boring little jobs that everyone else avoids.

Do you want to be a fitter and healthier? Would you like to look younger? Do you want to feel (1)................relaxed? Then try a (2)...............days at a healthy farm. Healthfarms are becoming (3)...............of the most popular places (4)....................a short break. I went to Halley Manor for a weekend. It's (5)...............largest health farm in the country (6)........it isn't the most expensive. After two exercise I (7)..........10 times better. But the best thing for me was...
Đọc tiếp

Do you want to be a fitter and healthier? Would you like to look younger? Do you want to feel (1)................relaxed? Then try a (2)...............days at a healthy farm. Healthfarms are becoming (3)...............of the most popular places (4)....................a short break. I went to Halley Manor for a weekend. It's (5)...............largest health farm in the country (6)........it isn't the most expensive. After two exercise I (7)..........10 times better. But the best thing for me was the food. It was all very healthy of (8).....n......, but it was excellent, too. If you are looking for something a (9)............ cheaper, try a winter break. Winter is the darknest and coldest (10)..............of the year, and it can also be the worst time for your body. We all eat too (11)..............and we (12)..........take enough exercise. A lot of health farms offer lower prices from Monday (13).............Friday, from November to March.

5
24 tháng 4 2021

Do you want to be fitter and healthier? Would you to look younger? Do you want to feel (1) ....more.... relaxed?Then try a (2) ....few....days at a health farm. Health farms are becoming (3) ....one.... of the most popular places (4) ....for.... a short break. I went to Henley Manor for a weekend. It's (5)....the....largest health farm in the country (6) ....but.... it isn't the most expensive.After two days of exercise I (7) ....feel....10 times better. But the best thing for me was the food. It was all very healthy of (8)....course....,but it was excellent,too.
If you are looking for something a (9)....little.... cheaper, try a winter break. Winter is the darkest and the coldest (10) ....season.... of the year,and it can also be the worst time for your body. We all eat too (11) ....much.... and we (12) ....don't.... take enough exercise. A lot of health farms offer lower prices from Monday (13)....to....Friday, from November to March.

25 tháng 4 2021

Do you want to be fitter and healthier? Would you to look younger? Do you want to feel (1) ....more.... relaxed?Then try a (2) ....few....days at a health farm. Health farms are becoming (3) ....one.... of the most popular places (4) ....for.... a short break. I went to Henley Manor for a weekend. It's (5)....the....largest health farm in the country (6) ....but.... it isn't the most expensive.After two days of exercise I (7) ....feel....10 times better. But the best thing for me was the food. It was all very healthy of (8)....course....,but it was excellent,too.
If you are looking for something a (9)....little.... cheaper, try a winter break. Winter is the darkest and the coldest (10) ....season.... of the year,and it can also be the worst time for your body. We all eat too (11) ....much.... and we (12) ....don't.... take enough exercise. A lot of health farms offer lower prices from Monday (13)....to....Friday, from November to March.

8 tháng 5 2018

I agree with the idea that in the future robots will be very useful to us. Firstly, robots can be made of non-biological materials, rendering them able to withstand environments too toxic, too high or low temperatures, or having other conditions unsuitable for human workers. Secondly, robots do not need to be fed "food" in the traditional sense. They can operate using electricity from a variety of sources. In space, such electricity can come from the sun via solar cells or from fuel carried on board used to make electricity. Thirdly, robots do not get tired, and they can work long hours in dangerous locations that would wear out most astronauts. Fourthly, robots can be equipped with sensors and tools that are more sophisated than the human eyes or ears or hands, rendering robots capable of highly complex tasks. Lastly, robots do not age over time. For long interstellar journeys, they can be placed in a dormant state, to be waken up months or years later ready to go to work. For these reasons and others, robots are ideal machines for use in building space stations on many planets.

9 tháng 5 2018

viết một đoạn văn ngấn mà đủ yêu  cầu là được, khoằng 5-15 câu thôi

28 tháng 9 2021

bài này chia hiện tại đơn

28 tháng 9 2021

It (0. be) is Sunday evening and my friends and I (1. be) are at Jane's birthday party. Jane (2. wear) is wearing a beautiful long dress and (3. stand) standing next to her boyfriend. Some guests (4. drink) are drinking wine or beer in the corner of the room. Some of her relatives (5. dance) are dancing in the middle of the room. Most people (6. sit) are sitting on chairs, (7. enjoy) enjoying foods and (8. chat) chatting with one another. We often (9. go) go to our friends' birthday parties. We always (10. dress) dress well and (11. travel) travel by taxi. Parties never (12. make) make us bored because we them.

k cho mik nha

I. Write the correct form of the verbs in past perfect simple.1. They came back home after they (finish) _____________ their work.2. She said that she (meet) _____________ Mr. Bean before.3. Before he went to bed, he (read) _____________ a novel.4. He told me he (not/wear) _____________ such kind of clothes before.5. When I came to the stadium, the match (start) _____________6. Before she listened to music, she (do) _____________ her homework.7. Last night, Peter (go) _____________ to the...
Đọc tiếp

I. Write the correct form of the verbs in past perfect simple.
1. They came back home after they (finish) _____________ their work.
2. She said that she (meet) _____________ Mr. Bean before.
3. Before he went to bed, he (read) _____________ a novel.
4. He told me he (not/wear) _____________ such kind of clothes before.
5. When I came to the stadium, the match (start) _____________
6. Before she listened to music, she (do) _____________ her homework.
7. Last night, Peter (go) _____________ to the supermarket before he went home
8. The storm destroyed the tent that we (build) ____________.
9. Liz (not / be) ____________ to New York before 2014.
10.When Johnathan went out to play soccer, he (do / already) ____________ his
homework.
11.Kristen ate all of the cake that our mom (make) ____________.
12.The doctor took off the plaster that she (put on) ____________ two weeks before.
13.The waiter brought a drink that I (not / order) ____________.
14.Kenny could not remember the words we (learn) ____________ three week before.
15.My kids collected coconuts that (fall) ____________ from the tree.
16.(she / phone) ____________ Jackie before she went to see him in Korea?
17.He (not / ride) ____________ a horse before that day.
18.Mum was annoyed because I ______ (not clean) my room.
19._______ (they / study) English before they went to the USA?
20.We were hungry because we ______ (not eat)

Ai nhanh nhất mik sẽ k 

2
29 tháng 10 2021

1-HAD FINISHED   

2-HAD MET

3-HAD READ

4-DIDN'T WEAR

5-HAD STARTED

6-HAD DID

7-HAD WENT

8-HAD BUILDED

9-DIDN'T BEEN 

10-HAD ALREADY DOES

11-HAD MADE

12-HAD PUT ON

13-DIDN'T ODERED

14-HAD LEARNED

15-HAD FALLED

16-SHE HAD PHONED

17-DIDN'T RODE

18-DIDN'T CLEANED

19-HAD STUDIED

20-DIDN'T ATE YET 

29 tháng 10 2021

CẢM ƠN BN NHA