Предмет: Математика, автор: Неизвестность98

740 помогите,пожалуйста

Приложения:

Ответы

Автор ответа: SashaLey

Ответ на фото, мб не верно

Приложения:

Автор ответа: MikiSuza27

Ответ:

1) 14х + 57у

2) - 33а + 11b

3) 2.5х - 0.4b

Пошаговое объяснение:

Это сейчас маленьким детям преподают? Прошу прощения, последнее вместо 5.9 х будет - 2.5x

Приложения:

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Математика, автор: razuk22000

даю 15 баллов пжжпжпжп

6 лет назад

Предмет: Українська мова, автор: prokirill2876

Із поданих трьох простих речень утвори складене поставивши розділові знаки підкреслити всіі члени речення в першому реченні ПРОШУ ВАС ДОПОМОЖІТЬ ШВИДКО ЯКЩО МОЖЕТЕ

1. Спустився вечір. Одразу все похолоднішало

2.Була чудова пора. Її нахивають золотою осінню

3.Я дуже люблю.Співає бабуся

6 лет назад

Предмет: Английский язык, автор: zlateva477

READING COMPREHENSION / 2 TERM
CITY GARBAGE : PROBLEMS AND SOLUTIONS.

Almost everything that is produced for human needs, with time becomes garbage. All sorts of methods have been tried to get rid of the wastes. They have been buried, removed as far as possible from population centres. Nevertheless, the problem still exists.
Nowadays the problem of domestic waste disposal has acquired a global nature. Cities with a population of several million form Everests of garbage. Every town dweller throws away nearly a ton of unwanted things annually. They wind up in the city garbage dumps, which take up hundreds of hectares of land. All such dumps are unsanitary. The mountains of garbage attract numerous rodents and birds which spread decomposition products. Poisonous substances together with rain waters get into underground waters and poison them. Even grass doesn’t grow on the sites of former dumps. Besides, the construction works in these areas have to be banned for 50 - 100 years.
Many useful elements, including those of organic origin, are lost in garbage dumps and it is impossible to restore them. While taking them from nature in enormous quantities man gives nothing back to it. Moreover, he turns out new consumer goods which can seriously upset the ecological balance.
The most effective method of waste disposal is to utilize it, in other words, to process it industrially. Different countries handle this engineering problem in different ways. Experts have developed many production processes which make it possible to reconvert mountains of garbage into substances of vital importance to industry and agriculture.
Domestic wastes, in particular tin cans, contain such valuable materials as tin, copper, zinc and others. These metals are extracted from them and after long processing they are recycled.
Of all domestic wastes the greatest trouble is given by plastics. Should used containers be burned?But resisting burning plastics only melt and release a smoke which poisons the atmosphere.
Scientists are searching for a solution by employing microorganisms, and not without some success.British researchers grew microbes which convert plastics into carbon.Scientists hope that in the near future bacteria will help solving the problems of utilizing plastic packets and other synthetic items.

Task 1. True or False.
1. Garbage dumps are located not far from population centres.
2. The problem of waste disposal disturbs scientists all over the world.
3. We don’t know how to get rid of plastics.
4. Garbage dumps take up little space.
5. Garbage dumps are the sources of diseases for people and animals.
6. In most cases garbage cannot be recycled.
7. It is possible to build a new house for living on the site of a former dump.
8. The best method of waste disposal is to utilize it.
9. Some bacteria are able to turn plastics into carbon.
10.Of all domestic wastes the greatest trouble is given by tin cans.
11. Tin cans contain valuable metals like tin, copper, zink, and others.
12.It is possible to reconvert garbage into substances used in industry and
agriculture.
Task 2. Answer the questions.
1. Why has the problem of city garbage dumps acquired a global nature?
2. How much garbage does every town dweller throw annually?
3. Where are the dumps usually located?
4. Do they take big areas?
5. Why do the garbage dumps harm people and animals?
6. Why doesn’t grass grow on the sites of the former dumps?
7. How do garbage dumps influence the environment?
8. What is the most effective method of waste disposal?
9. How can garbage be useful in industry and agriculture?
10.What garbage is the most complicated to get rid of?

6 лет назад

Предмет: Алгебра, автор: lalka1951

решите пожалуйста этот пример (х-3)(√х+1)=0
заранее спасибо!

9 лет назад

Предмет: Математика, автор: злзуля

Сума 2 чисел 324. Яки ци числа, якщо 2 число бильше за перше на 22

9 лет назад