получается делаем так:
сначала решаем уравнение как и обычно т.е. теоремой виетта или дискриминантом
х^2-4х+3=0
я решу теоремой виетта:
сумма корней равна 4
произведение 3
значит корни 1 и 3
далее:
есть такая формула разложение на множетели квадратного уравнения выглядит так: a(x-x1)(x-x2), где а-множетель перед квадратом в нашем случае это 1, х1 и х2 - корни.
подставим в неё наши корни, получим (x-1)(x-3)=0
так а теперь решим это неравенство (x-1)(x-3)> 0
методом интегралов ( тут 3 промежутка от минус бесконечности до 1 от 1 до 3 и от 3 до плюс бесконечности):
допустим х =0, подставим (0-1)(0-3)=3 знак + значит в промежутке от минус бесконечности до 1 знак +
от 1 до 3 знак -
от 3 до плюс бесконечности +
ответ: х принадлежит промежутку от минус бесконечности до 1 и от 3 до плюс бесконечности
Kyiv is the city with a history that spans more than a millennium. It is one of the most picturesque cities in the world. Green streets fully harmonize with impressive architecture.
During the reign of Prince Volodymyr the Great, the first stone church in Ukraine was built. The Golden Gate, built in the 11th century, was the primary entrance to the fortress. It was very famous in Eastern Europe. It was restored in 1989.
St Sophia’s Cathedral is located not far from the Golden Gate. It faces a square, in the centre of which there is a monument to Bohdan Khmelnytsky, the Hetman of the Ukrainian Cossacks.
St Sophia’s Cathedral was often used to receive foreign ambassadors and sign treaties in the past.
За сделано 10 предложений.
2. Pushkin wrote many great poems.
3. This film includes three parts.
4. The cottage is built / is being built by qualified workers.
5. This bird is flying high.
6. She is taller than her sister.
7. I will meet you at half past six.
8. How is she? She is fine, thanks.
9. Who wants to take part in this competition?
10. I found a manager at the reception. The manager explained everything to me quite clearly.
11. Do we have to do it right now?
12. A man suddenly came up to me at the crossing and asked the way.
13. Close the door!
14. When the ball bounced out of the sports ground, a/the boy ran to pick it.
15. We work in a small company.
16. The Russian Federation will host Football World Cup in 2018.
17. The parcels have not been delivered yet.
18. We have four pets: a cat and three puppies.
19. We suppose you will weigh everything carefully before the decision.
20. When she looked in they were sitting calmly in wait.
21. It is not my fault. It is hers.
22. In Italy pasta is usually served with (some )cheese.
23. When we finish we will call you.
24. I will be able to do it tomorrow.
25. Should I reply to this letter?