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Вопрос по геометрии:
Решите неравенство (3x-8)^2 больше или равно (8x -3)^2-
Автор:
zanelawson
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Ответ:
x[-1;1]
Объяснение:
(3x-8)^2>=(8x-3)^2
9x^2-48x+64>=64x^2-48x+9
9x^2-64x^2>=9-64
-55x^2+55>=0
55(1-x^2)>=0
(1-x^2)=0
(1-x)(1+x)=0
1-x=0 1+x=0
x=1 x=-1
Еще 4 ненужных тебе вопроса, но это важно для поиска
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Вопрос по физике:
Транспортер поднимает за 1 час гравий объемом 240 м3 на высоту 6 м .Плотность гравия 1700кг/м3.Найти мощность двигателя
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Ответов: 2
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6 лет назад
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Вопрос по английскому языку:
ПОМОГИТЕ ПОЖАЛУЙСТА
1. Выберите правильный артикль.
One of … most popular tools for writing is … pencil.
A) -, -.
B) the, a
C) -, the
D) the, -
E) a, a
2.Укажите предложение, в котором глагол «to have» является модальным.
A) The letter has been written by me.
B) He has invited his friends.
C) We will have to come on Sunday.
D) He had a good rest.
E) We have a nice school.
3. Выберите правильную форму глагола «to be».
Your watch … 2 minutes fast, it is 10 o’clock now.
A) are
B) was
C) were
D) is
E) be
4. Выберите правильный вариант.
I couldn’t find the book that you … me.
A) gave
B) had given
C) have given
D) was given
E) were given
5. Выберите правильный вариант.
I couldn’t see the sky … the clouds.
A) through
B) under
C) after
D) in
E) to
6. Выберите правильный вариант.
I think I … my bag. I can’t find it anywhere.
A) had lost
B) have lost
C) was lost
D) lost
E) were lost
7. Выберите правильный ответ.
These newspapers … by us.
A) have brought
B) will bring
C) have been brought
D) was bought
E) is bought
8. Выберите правильный ответ.
He … to tell the truth.
A) asking
B) were asked
C) ask
D) was asked
E) was asking
9. Выберите правильный ответ.
Who can tell me where … ?
A) my key is
B) is my key
C) my key were
D) my key had been
E) my key are
10.Выберите правильный ответ.
You … work hard to pass the exam.
A) must
B) may
C) can
D) might
E) be to
11. Выберите правильный ответ.
I wonder what time … now.
A) it is
B) it was
C) it were
D) it has been
E) is it
12.Выберите правильный вариант: I caught two ... .
A) fishes
B) hare
C) fishs
D) butterfly
E) fish
13. Правильная форма глагола в страдательном залоге:
He (to ask) to bring a glass of water.
A) Are asked.
B) Was asked.
C) Was ask.
D) Is ask.
E) Ask.
14. Лишнее слово:
A) Grapes.
B) Pepper.
C) Carrot.
D) Cabbage.
E) Onion.
15. Неверное словосочетание:
A) Junk food.
B) Tasty food
C) Starving food.
D) Delicious food.
E) Wealthy food.
16. Закончите пословицу:
A change of work...
A) ... must have an end.
B) ... than words.
C) ... home is best.
D) ... make long friends.
E) ... is as good as a rest.
17. Правильный вопрос:
- ... ?
- No, you needn’t read the text.
A) Will I read the text?
B) Could I read the text?
C) May read I the text?
D) Must I read the text?
E) Would I read the text?
18. Поставьте предложение в прошедшее время:
We promise we shall finish the work in time.
A) We promised we did finish the work in time.
B) We promised we shall finish the work in time.
C) We promised we should finish the work in time.
D) We promised we finished the work in time.
E) We promised we should finished the work in time.
19. Правильный вариант:
W.A.Mozart was born in __ .
A) Australia
B) Austria
C) Holland
D) Wales
E) Canada
20. Найдите правильный ответ.
The Kasakhs prepare very … kuyrdak.
A) taste
B) tasty
C) tastful
D) tastless
E) out of tast
21.Найдите правильный ответ.
Harvest festival is in …
A) November
B) September
C) October
D) August
E) December
22. America consists … North America and South America.
A) in
B) with
C) between
D) off
E) of
23.Найдите правильный ответ.
Oscar Wild is a famous … writer.
A) English
B) German
C) American
D) Kazakh
E) Russian
24. If you go to New York, you will see ……….
A) Big Ben
B) The Capitol
C) The Empire State Building
D) The White House
E) Ak Orda
25. What is the home of the American President?
A) The Capitol
B) The White House
C) the House of Representatives
D) Big Ben
E) The Hotel
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Ответов: 1
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6 лет назад
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Вопрос по физике:
Определить сопротивление нагревательного элемента утюга, работающего от сети с напряжением 220 В, если за 20 мин работы в нем выделилось в виде тепла 1156 кДж энергии -
Ответов: 3
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6 лет назад
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Вопрос по химии:
Массовая доля в кислорода в оксиде цинка (||) а) 1 б) 0,8 в) 1,2 г) 0,2-
Ответов: 1
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6 лет назад
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