Предмет: Математика, автор: nastiashnitko

Задача: В наборах было 36 пирожных. Из одного набора съели 2 пирожных, что в три раза меньше, чем съели из другого набора набора. Сколько пирожных осталось?

Ответы

Автор ответа: КсюшаГре

В первом : 2; во втором 2*3=6; значит съели 6+2=8; осталось 36-8=28

Автор ответа: ksysha02

36-2= 34
36-6=30
34+30=64

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THE NANOBOTS!
Scientists recently created a microscopic robot that can crawl along molecules of DNA. Combining the science of molecular biology and nanotechnology, this unique mechanism, dubbed a 'nano-spider', was developed by a team of researchers from Columbia University in New York with the help of colleagues in Arizona, California and Michigan. The groundbreaking device measures a mere four nanometres in width-an amazing 100.000 times smaller than the diameter of a10 human hair.
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It is interesting to note that the nano-spiders are made of DNA molecules. The spider's body is composed of a common protein called streptavidin. Unlike a real spider, however, the nano-spider has only got four legs which are single strands of DNA protein attached to the body.
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On the other hand, there are a number of arguments against the use of nanotechnology. Most of these concerns are over safety regulations. People are concerned that nanotechnology is not only being used to build small computer parts, but that it is also being used in food, clothing and medicine. Those with concerns would like to see stricter rules applied to the nanotechnology industry and they would like further tests to be carried out on products before they are allowed to enter the market. G
Billions of dollars are being invested in the research and development of nano-products worldwide. Robots are already working in hospitals around the world, often performing operations that require a steadier hand or more precision than a human is capable of. These microscopic robots, therefore, will allow treatments to be given that are currently impossible or which call for more invasive surgery.

1)In the first paragraph, the writer says that the nano-spider

A is much thicker than a human hair.

B cannot be seen under a microscope.

C was invented by an individual scientist.

D is an extremely small machine.

2. Why does the writer suggest nano-spiders can be classified as robots?

A because they have the features of a robot

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D because they are microscopic devices

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B the walking distance a DNA walker can do

C the length of the DNA walkers

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B They are already being used to fight cancer.

C They have been used for various medical purposes in the past.

D They have not actually been invented yet.

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C There are concerns about whether the industry has strict rules for safety.

D There are no concerns about nanotechnology in medicine.

6 All in all, the writer presents nanobots as devices which

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B have already been in use for many years.

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