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Какое максимальное количество кусков может получиться, если распилить два звена круглой цепи из 12 звеньев
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Предмет:
Математика -
Автор:
gavinhall - 6 лет назад
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Ответы 1
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Если распилить 1 звено то круглая цепь превратится в прямую, если распилить 1 любое звено из полученной цепи (кроме крайних) то образуется 2 куска
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Автор:
jonroth - 6 лет назад
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ANNOUNCER: Good evening! Dear guests, welcome to our TV studio. Listen and see our program "For Those Who Think". Life and energy is our problem.
The world's energy resources are limited. Nobody knows exactly how much fuel is left. Of course, we have to do something and do it as soon as possible.
Unit 6 161
I'd like to welcome our first guest, Professor Oleg Petrov.
PROFESSOR OLEG PETROV: Well, we are in energy crisis and we'll have to do something quickly. Fossil fuels (coal, oil and natural gas) are rapidly running out. The tragedy is that fossil fuels are too valuable to waste on the production of electricity. I think that nuclear power is the only real alternative. We are getting some electricity from nuclear power already. There has been a lot of protest against nuclear power. But nuclear power-stations will not be as dangerous as some people say if safety regulations in power-stations are very strict.
ANNOUNCER: Thank you, Professor. Our next guest is a member of the campaign against nuclear energy, Mr. Dymov.
MR. DYMOV: Right. I must disagree totally with Professor Petrov. Let's look at the facts. In the case of an accident huge areas are evacuated, and they remain contaminated with radioactivity for years. Radioactivity causes cancer and may affect future generations.
Next, nuclear waste. There is no technology for absolutely safe disposal. Some of this waste will remain active for thousands of years. Is that what you want to leave to your children? And their children's children?
I consider that nuclear energy is expensive, dangerous, and evil, and most of all, absolutely unnecessary.
But Dr. Krimova will be saying more about the problem.
ANNOUNCER: Thank you, Mr. Dymov. Now I'm very pleased to welcome Dr. Krimova, our final speaker. She is the author of several books on alternative technology.
DR. KRIMOVA: Hello! I'd like to begin by agreeing with Mr. Dymov. We can develop alternative sources of power. Instead of burning fossil fuels we should be concentrating on more economic uses of electricity. Electricity can be produced from any source of energy. You can save more by conservation than you can produce for the same money. Unless we do research on solar energy, wind power, wave power, tidal power, etc., our fossil fuels will run out, and we'll all freeze or starve to death. We have to spend much more on research, and don't forget that energy from the sun, the waves and the wind lasts forever. We really won't survive unless we start working on cleaner, safer sources of energy.
ANNOUNCER: Thank you very much, Dr. Krimova. Now we are opening the discussion.
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Предмет:
Английский язык -
Автор:
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Ответов:
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