На прямой отметили 15 точек. сколько всего получилось отрезков концами которых являются эти точки?

1. Yes, it has.

2. The atomic space and energy age was followed by the age of computer.

3. Using computers and the internet develops important skills in young people. Teens can visit different countries and cities. They meet new people and communicate with their peers from different countries. They learn a lot about the life of people from other countries. Young people find a lot of useful information in the Internet.

4. Yes, they do.

5. Internet is very useful, because it is a huge base of data and knowledge, where you can find any thing you want from movies and music of interest to the vast number of books, newspapers and magazines.To find more information, download the required essay, watch video about some books which you have already read, everything can be done through the Internet.

6. Many devices became compatible with computer during the last years, such as mobile phones, navigators and etc.

7. Yes, I can.

8. Of course, I like such communication but I prefer real one.

9. Computer games are probably also a part of our free time and for many people it becomes impossible to tear themselves away.

10. Yes, they do.

11. Yes, he does.

12. I agree with this article. I don't mean that I am against computer and the Internet, but it should have reasonable limits.

0,34587≈0 0,3 0,35 0,346;

12,98575≈13 13,0 12,99 12,986

4,1749≈4 4,2 4,17 4,175

5,1984≈5 5,2 5,20 5,198

5,5643≈6 5,6 5,56 5,564

0,1114≈0 0,1 0,11 0,111

7,5614≈8 7,6 7,56 7,561

8,67003≈9 8,7 8,67 8,670

9,9999≈10 10,0 10,00 10,000

6,2316≈6 6,2 6,23 6,232

Правило:

Оставить одну - если до десятых, две - если до сотых или три - если до тысячных цифры после запятой, остальные отбросить. Согласно правилу: если первая отбрасываемая цифра — 0, 1, 2, 3 или 4, то цифра после запятой остается той же. Если мы отбрасываем цифру 5, 6, 7, 8 или 9 — цифра после запятой увеличивается на единицу.