Có 900 số có 3 chữ số 

Sau đó , ta tìm các số khác nhau có 3 chữ số 

Chữ số hàng trăm có 9 cách chọn 

Chữ số hàng chục có 9 cách

Chữ số hàng đơn vị có 8 cách chọn 

Số số hạng có 3 chữ số khác nhau là ; 

9 x 9 x 8 = 648 ( số ) 

Có số số hạng có ít nhất 2 chữ số giống nhau là : 

900 - 648 = 252 ( số ) 

   Đáp số : 252 số 

Ai k mình mình k lại 

Bài giải:

a) Số dân ở Hà Nội năm đó là:

2627 x 921 = 2419467 (người)

 Số dân ở Sơn La năm đó là: 

61 x 14210 = 866810 (người)

Tỉ số phần trăm của số dân ở Sơn La và số dân ở Hà Nội là:

 866810 : 2419467 = 0,3582...

0,3582...= 35,82%.

b) Nếu mật độ dân số của Sơn La là 100 người/km² thì trung bình mỗi ki-lô-mét vuông sẽ có thêm : 100 - 61 = 39 (người)

Khi đó số dân ở Sơn La tăng thêm là:

39 x 14210 = 554190 (người) 

Đáp số: 554190 người.

Ancient Aliens’ was one of most popular television series and it appeared interesting to me on some specific grounds. I loved watching the episodes. Thanks for the question and I will now describe it in brief here.

This was the documentary that dealt with the extraterrestrial contact with the human. It is believed that the ancient humans came in touch with aliens long ago. In fact, it is all about the speculations that the extraterrestrial beings have wandered on the planet and gained knowledge about many things that they wanted to know. It was also about the discussion of their existence. The documentary also publicised ideas about aliens, monster and many other conspiracies related to them. However, most of the theories presented at the show contained some logic while the modernism is against the view.

I had an interest in aliens. So, it was a great chance for me to know about them and clear my conceptions. Besides, I also was interested to know about if aliens are real or not. I tried to gather knowledge about them but there were no reliable sources that could confirm me about the existence of the aliens. The videos available on youtube and other websites failed to make me satisfied with the matter. So, I decided to watch the documentary. It was really helpful for me to many extents. I was entertained with the episodes and developed an idea of the reality.

I came to know about many interesting facts about aliens, monsters and other extraterrestrial beings. The show mostly focused on some hypothesis. The hypothesis reported that the ancient people had their contacts with the extraterrestrial beings. The show exhibited some evidence against its claims. But the modern scientists are against this belief. They do not comply with the evidence showed in the television documentary. Rather they criticised the show for exhibiting pseudoscience. I also learnt that the advanced beings visited the earth in ancient time and gathered knowledge about the people living on this planet.

I know all the facts shown in the documentary is not real. But the documentary makers have made it in a striking way that it has become attractive. It has been on the air since 2010 and despite negative remarks from different quarters, the popularity of the show did not fall. It was interesting to me as the hypothesis was presented in a realistic manner. Further, the documentary has taken interviews of various people who are engaged in extraterrestrial research. It tried to prove the existence of the aliens and that they visited the earth long ago. Besides, the evidence against the claims also drew attention from my part. So, based on all the grounds, the documentary appeared interesting to me.

"Describe a TV documentary you watched that was particularly interesting."

1. Flint Town is all about police investigations and how they dealt with a community where violence prevailed. The locality was also dealing with the water crisis. I decided to watch the documentary as one of my friends recommended it to me. It was a wonderful documentary. In fact, dealing with a community issue for police often becomes difficult. And when there are less infrastructure and resources, it becomes harder to battle the dilemma. I found the documentary interesting for its thrilling nature and the way the plot advanced.

11 110 000 000

23 * 23 = ?  

23 * 23 = 529

hãy tích mik nhé các bạn !!!!

3 giờ nhé mai

Lớp 6B có số bạn là :

27 :3/5 = 45 ( học sinh )

 Đáp số : 45 học sinh 

=3000

to nghi la 3/4