Предмет: Математика, автор: andrievskiy418

2. Решите уравнение: 1) (6х2-2)-6х+2=0 2) (2x-3)2=2x-1

Ответы

Автор ответа: anastasiamiller769
0

Ответ:

скачай пхото матч ивсё

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Прочитайте текст. Определите, какие из приведённых утверждений А7-А14 соответст­вуют содержанию текста (1 — True), какие не соответствуют (2 — False) и о чём в тек­сте не сказано, то есть на основании текста нельзя дать ни положительного, ни отрица­тельного ответа (3 — Not stated).

Do you know what time it is right now? How do you know? Did you take a look at a wall clock? Glance at your wrist watch? Sneak a peek at your mobile phone? Today we take time-keeping for granted, but of course the very concept of time-keeping is a human invention, with its origins dat­ing back thousands of years.The first mechanism was probably the sun-dial. This method, which used the moving shadow of the sun to tell time, was widely used in ancient times. A well-constructed sundial is quite accurate, but of course it only works during the day, and only on sunny days. Hourglasses were an invention that made it possible to mark the passage of time at night, in-doors, and in the dark.All the great ancient civilizations — Greek and Roman, Chinese, Byzantine, Islam — developed water clocks, which were very accurate. These devices were commonly used until the invention of the pendulum clock in the 17th century.The earliest mechanical clocks didn't have a visual indicator; they simply announced the time with striking bells. Later the 12-hour circular dial or clock face became standard. A 10-hour dial was briefly popular during the French Revolution when the metric system was applied to time keep­ing. And the 24 hour dial is commonly used by military organizations and transportation systems.Today digital displays are used everywhere — on wrist watches, wall clocks, computer screens, etc. This numerical representation of time can be based on the 12-hour system (1:00 am, 1:00 pm) or the 24-hour system (01:00 or 13:00).Like reading, telling time is something all young children have to be taught. Experts suggest that you begin this when a child is about five years old. Even though digital clocks are everywhere, it's important to begin with traditional dial clocks, with second hands, to help the child literally see the passage of time. Giving a child his or her own wrist watch — just a cheap child's version — can be very helpful. Teaching a child to tell time can be quite challenging, but it's a life skill that every one of us needs. 
А7| People have been interested in time-keeping for centuries.
1) True                    2) False                      3) Not stated
A8 A well-constructed sundial could be reliable all the day round.
1) True                    2) False                      3) Not stated
A9 Water clocks were the most popular and reliable clocks in ancient and medieval times1) True                    2) False                      3) Not stated
A10 First mechanical clocks told the time with bells that could strike simple melodies.
1) True                    2) False                      3) Not stated
A11| With the invention of a visual indicator, a 12-hour clock face has become a standard.
1) True                    2) False                      3) Not stated
A12 For a short time a 10-hour clock face was popular all over Europe.
1) True                    2) False                      3) Not stated
A13 Both 12-hour and 24-hour systems are used in modern digital clocks and watches.
1) True                    2) False                      3) Not stated
A14 It's better to use clocks without hands when you teach a child to tell time.
1) True                    2) False                      3) Not stated
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