X y 5 3x y 3: Решите системы уравнений способом сложения. x+y=3 3x-y=5 ——— 3x-y=5 2x+5y=-8

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решите систему уравнений графическим способом x-y=5 3x+y=3 — Знания.site

Составьте 5 вопросов к любым предложениям из текста. Вопросы: (Общий, специальный, разделительный,

альтернативный, вопрос к подлежащему). с

TECHNOLOGICAL PROGRESS

For centuries people have been inventing things to make life

easier. Among the greatest inventions of the past are the auto-

mobile, the steam engine, the electricity, the telephone and tel-

evision. Since the beginning of the 20th century people have

made a huge step in technology. Now we live in flats, talk to

people who live in other parts of the world, travel from one

place to another by plane. All these things are a product of

technological progress and it is still growing rapidly.

Today we live in the world of machines and computers. Every

day more and more gadgets appear and all of them make our

life easier.

Some of the new inventions have become so afford-

able and common, that now people cannot imagine life with-

out them. For example, the mobile phone has turned from an

chtexpensive portable phone into an inexpensive data, e-mail, and

voice service that almost anyone can afford. At the speed that

mobile phones are evolving they may one day replace in-home

phone services. Years ago mobile phones were buTky and

required large batteries in a carrying case. Today’s mobiles fit

in a pocket and can replace a computer.

Another example of modern high-tech inventions is the

Internet. Almost every company in the world has its own web-

site. The Internet provides any kind of information on any

topic. Of course, some of the sources are not reliable, but the

Internet gives a very good opportunity to shop, book rooms

and flights, watch films, listen to music and many other things.

The Internet also gives an opportunity to make new friends

and find old ones thanks to social networking sites such as

Facebook or Vkontakte.

Computer technology has influenced production processes

and made work easier. Toy companies, for example, incorpo-

rate computer chips in toys which make them move, talk andsing on their own. The car industry has computer systems

installed in cars and they give information on car’s condition,

including tire pressure, headlights or the temperature inside

and outside. Printing has become much easier with the com-

puter-based printing machines.

Tablet PCs are becoming more and more popular today. They

are much lighter than notebooks or netbooks and they contain

all the software that is needed for business, studies and please-

ure. EBook readers are a new invention too. This is a very con- 1

venient gadget that allows uploading books in different elec-

tronic formats. Instead of carrying one paperback book in a

bag, you can carry one eBook reader with thousands of books

on it.

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Surely, these new inventions are not the last ones that

humanity has developed and many others will be developed year

16

upon year.

TBET, TECHNOLOGICAL PROGRESS

3 6 Решить для ? cos(x)=1/2 7 Найти x sin(x)=-1/2 8 Преобразование градусов в радианы 225
9 Решить для ? cos(x)=(квадратный корень из 2)/2 10 Найти x cos(x)=(квадратный корень из 3)/2 11 Найти x sin(x)=(квадратный корень из 3)/2 92=9 14 Преобразование градусов в радианы 120 градусов 15 Преобразование градусов в радианы 180 16 Найти точное значение желтовато-коричневый(195)
92-4 38 Найти точное значение грех(255) 39 Оценить лог база 27 из 36 40 Преобразовать из радианов в градусы 2 шт.

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