Предмет: Алгебра, автор: dtggju

помогите решить примеры 25-y в квадрате a2-6ab+9b2 и еще уравнение 36-(6-x)2=x(2,5-x)

Ответы

Автор ответа: Reginka217

если (25-у) в квадрате=625-50у+у в квадрате

или 25-у2=(5-у)(5+у)...смотря как у вас скобки стоят, или у в квадрате..я два варианта написала

а2-6ab+9b2=(a-3b) в квадрате

36-(6-х)2=х(2,5-х)

36-12+2х=2,5х-х2

х2-0,5х+24=0

D=0,25-4*24, D меньше 0

Ответ. нет корней

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Биология, автор: valeriadeg

Дана первая цепочка ДНК: А-А-Г-Т-Т-Ц-Ц-Г-А. Зная, что ДНК является двуцепочечной и, используя принцип комплементарности, составьте вторую цепь соответствующую первой цепи для данной ДНК.
Помогите пожалуйста

6 лет назад

Предмет: Биология, автор: belkinsarr

1. Усложнение структурно-функциональной организации, поднятие ее на более высокий уровень – это …
А) Идиоадаптация Б) Ароморфоз В) Общая дегенерация Г) Все ответы верны
2. Общая дегенерация присутствует у …
А) Бычьего цепня Б) Кролика В) Орла Г) Шмеля
3. Приспособление к специальным условиям среды - это…
А) Идиоадаптация Б) Ароморфоз В) Общая дегенерация Г) Эволюция
4. Примером ароморфоза служит …
А) Переход к сидячему образу жизни Б) Покровительственная окраска животных
В) Отсутствие корней у растений-паразитов Г) Появление челюстей у позвоночных
5. Упрощение организации организма это…
А) Идиоадаптация Б) Ароморфоз В) Общая дегенерация Г) Эволюция
6. Выберите лишнее …
А) Утрата листьев растениями-паразитами Б) Редуцирование органов чувств у плоских червей
В) Плоская форма тела скатов и камбалы Г) Отсутствие корней у растений-паразитов
7. Примером идиоадаптации не является …
А) Многообразие форм конечностей у отрядов грызунов Б) Редуцирование органов чувств у плоских червей
В) Плоская форма тела скатов и камбалы Г) Многообразие форм клюва у птиц
8. Ароморфоз, идиоадаптация, общая дегенерация – это пути достижения
А) Биологического регресса Б) Биологического равновесия
В) Биологического процесса Г) Биологического прогресса
9. Ароморфозом не является …
А) Переход животных к сидячему образу жизни Б) Появление скелета у животных
В) Возникновение жабр и легких Г) Появление челюстей у позвоночных
10. Найдите лишнее
А) Появление сердца у рыб Б) Появление поперечнополосатой мускулатуры у членистоногих
В) Разнообразие форм конечностей у зайцеобразных Г) Разделение артериального и венозного кровотока у птиц

6 лет назад

Предмет: Английский язык, автор: asemai0102

ПОМОГИТЕ

1. The University of Bologna _since 1167

a have been

b has been

cwas
d be
e is

2. Many famous people _ from Bologna especially in law and scienсе

a have graduated

b has graduated

c graduates

d graduated

e graduates

3. John Bruce _three million euros in a lottery

a) has won

b) won

c) win

d) was winning

e) wins

4. Let`s go out. The rain _

a) stoppe

b) has stopped

c) stops

d) stop

e) will stop

5. _the train stopped, all the passengers got off.

a) While

b) When

c) As

d) Then

e ) During

6. I didn`t interrupt him because he _ to the teacher.

a) were speaking

b) was speaking

c) spoke

d) is speaking

e ) speaks

7. What _Tom`s wife _ when she heard the news?

a) are / saying

b) was /saying

c) has /said

d) did/say

e) is/saying

8. His friend never ¬__ by train again.

a) travelled

b) didn`t travel

c) was travelling

d) is travelling

e ) did travel

9. As he ¬¬¬__down the street, he __ a voice in his head

a) was walking /was hearing

b) was walking/heard

c) is walking/heard

d) has walked/ were hearing

e) walked/heard

10. When she got home, she __ dinner.

a) was making

b) had made

c) made

d) has made

e) makes

11. After the teacher finished, the students _some questions.

a) were asking

b) asked

c) are asking

d) have asked

e) did ask

12. Max _his car to work when it happened.

a) was driving

b) is driving

c) drives

d) drove

e) driven

13. While we _ for the bus, it started to rain.

a) were waiting

b) are waiting

c) waited

d) wait

e) is waiting

14. When I got home, my mom and dad_ coffee in the kitchen.

a) are having

b) were having

c) had

d) have

e ) had had

15. I_a student for two years.

a) am

b) have been

c) was

d) were

e) was been

16. Obama _ a president in 2009

a) became

b) become

c) has become

d) is becoming

e) becomes

17. I don`t have enough time for __ computer games.

a) have played

b) was playing

c) is playing

d) playing

e) played

18. The greenhouse_is an increase in the amount of carbon dioxide.

a) effect

b) protection

c) pollution

d) recycle

e ) environment

19. The energy generated by the _is both very efficient.

a) windmill

b) protection

c) pollution

d) recycle

e) environment

20. The Japanese __ more than half their waste paper.

a) deforestation

b) gases

c) pollution

d) recycle

e) environment

21. The most important problem is gradual __ of the surface of the Earth.

a) pollution

b) warming

c) deforestation

d) gases

e) dust

22. Climate change and human activities, such as intensive agriculture and industry, are two main causes of ___.

a) pollution

b) warming

c) deforestation

d) gases

e) dust

23. I’ve drunk milk every ___ day of my life, and it’s never done me any harm.

a) single

b) one

c) particular

d) individual

e) good

24. I like Mary for her friendly smile and her ___ of humour.

a) manner

b) sense

c) way

d) impression

e) feelings

25. The wonderful smell of freshly ___ coffee hit us as we entered the store.

a) smashed

b) pressed

c) ground

d) crushed

e) done

26. I really hope you can find a __ to this problem.

a) result

b) solution

c) conclusion

d) way

e) answer

27. Sleep and rest are incredibly __ for your well-being

a) health

b) important

c) good

d) enough

e) much

28. Young people typically __ at least 8 hours of sleep a night to feel and function well..

a) want

b) see

c) need

d) know

e) show

29. Good sleep __learning, concentration and memory.

a) improves

b) shows

c) takes

d) feels

e) drives

30. We often feel ¬¬__ when we eat too much food that is not healthy for us.

a) sick

b) happy

c) surprised

d) responsible

e) well

31. You need to learn how to _ care of yourself.

a) make

b) do

c) take

d) have

e ) get

32 . There are a lot of things you need to do to take care _ yourself.

a) of

b) after

c) about

d) on

e) with

33. As we grow, we have to use our experience about the world to keep ourselves _.

a) silent

b) away

c) occupied

d) clean

e) safe

34. You cannot ¬¬¬¬__ more than a few days without food or water.

a) go

b) sleep

c) survive

d) walk

e) take

35. You should ¬¬¬¬_ things such as too much caffeine or sugar

a) do

b) survive

c) produce

d) organize

e) avoid

36. There is even evidence that exercise makes our brains _more efficiently too!

a) walk

b) live

c) do

d) work

e) have

37. I tried to _ in the dictionary.

a) look after

b) look at

c) look back

d) look up

e) look for

38. He _the dog with interest

a) look after

b) look at

c) look back

d) look up

e) look for

39. Angie doesn’t like to_ on her past. She keeps her on the future.

a) look after

b) look at

c) look back

d) look up

e) look for

40. I am waiting _you at the station

a) at

b) about

c) for

d) after

e) to

6 лет назад

Предмет: Математика, автор: Englishman

Сумма длин всех ребер прямоугольного параллелепипеда равен 112 см, два его измерения - 14 см и 9 см. Найдите третье измерение.

10 лет назад

Предмет: Алгебра, автор: Vovan2nik

развяжите неравенство Х в степени Log X по основанию 2 (меньше или равно) 16

10 лет назад