Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
Vì tập hợp xét là 100 số tự nhiên đâu tiên nên tổng các chữ số của 1 số trong đó nhỏ nhất bằng 0 (chính là số 0) và lớn nhất bằng 9 + 9 = 18
như vậy tổng các chữ số của 1 số có thể nhận các giá trị từ 0; 1; 2;...;18. Tức là, k \(\in\) {0;1;2;...;18}
Để số lượng các số có tổng chữ số bằng nhau là lớn nhất thì mỗi số \(\in\) {0;1;2;...;18} có nhiều cách phân tích thành tổng của hai chữ số nhất
dễ dàng loại ngay 0;1; 2;3;
4 = 4 + 0 = 3 + 1 = 2+ 2
5 = 5 + 0 = 4 + 1 = 2 + 3
6 = 6 + 0 = 5 + 1 = 4 + 2 = 3 + 3
7 = 7 + 0 = 6 + 1 = 5 + 2 = 4 + 3
8 = 8 + 0 = 7 + 1 = 6 + 2 = 5 + 3 = 4 + 4
9 = 9 + 0 = ...= 5 + 4
10 = 9 + 1 = 8 + 2 = 7 + 3 = 6 + 4 = 5 + 5
11 = 9 + 2 = 8 + 3 = 7 + 4 = 6 + 5
12 = 8 + 4 = 7 + 5 = 6 + 6
....18 = 9 + 9
=> Với k = 8 hoặc k = 10 có nhiều cách phân tích nhất , ứng với 5 số
Vậy k = 8 hoặc k = 10
![](https://rs.olm.vn/images/avt/0.png?1311)
1. from 2. peaceful 3.flowers 4.for 5. however 6. carpet 7. often 8.water 9. path 10.fresh
1. from
2. peaceful
3. flowers
4. for
5. however
6. carpet
7. often
8. water
9. path
10. fresh
![](https://rs.olm.vn/images/avt/0.png?1311)
1. do you live in an apartment?
2. are there any stores on the street?
3. is your house new?
4. is a hotel near your house?
5. is it quiet here?
6. are the flowers beautiful?
7. does she live in a big house?
8. is the lake behind the house?
![](https://rs.olm.vn/images/avt/0.png?1311)
1. The hotel is in front of my house.
2. There are many muontains and rivers in our country.
3. Viet Nam has a lot of rain .
4. The world has many big seas.
5. Mount Fuji in Japan is a beautiful mountain.
6. Mount Everest is higher than Mount Phaxipang.
7. My sister goes to the supermarket on foot.
8. Our garden has many flowers.
9. Does your father get to work by bicycle ?
10. Nam ' s classroom is in front of the garden.
11. Tom travels to work by car every morning.
1. My house is behind the hotel
=> The hotel is in front of my house
2. Our country has lots of mountains and rivers
=> There are many mountains and rivers in our country
3. There is a lot of rain in Vietnam
=> Viet Nam has a lot of rain
4. There are many big seas in the world
=> The world has many big seas
5. Japan has Mount Fuji. It's a beautiful mountain.
=> Mount Fuji is a beautiful mountain in Japan
6. Mount Fansipan is lower than Mount Everest
=> Mount Everest is higher than Mount Fansipan
7. My sister walks to the supermarket
=> My sister goes to the supermarket on foot
8. There are many flowers in the (our) garden
=> Our garden has many flowers
9. Does your father cycle to work?
=> Does your father get the cycle to work?
10. The garden is behind Nam's classroom
=> Nam's classroom is in front of the garden
11. Tom drives to work every morning
=> Tom travels to work by car/ motorbike every morning
![](https://rs.olm.vn/images/avt/0.png?1311)
1.what about go to the park this afternoon
2.she is beatiful
Cái này bn vào trang khác mà hỏi nhưng mk cũng hướng dẫn thôi
1)What about going to the park this afternoon?
2)She is a beautiful girl
D.among
D.among