Ответ по предмету Алгебра: Если отрезок DC= 15 см и LK=0,2⋅DC, то LK= см.

Предмет: Русский язык, автор: greendaytrecool

1 год назад

Предмет: Английский язык, автор: Валерия3554

Ребяят,помогайте!! Очень плохо с английским(( А перевод нормальный нужен,с грамматикой! Пожалуйста!
In the nineteenth century, machines changed the world. Suddenly, people could travel more easily and communicate more quickly. Work changed, too, and many people got jobs in factories. It was the start of the Industrial Age.
The second half of the twentieth century saw the start of the Computer Age. At first, computers were very difficult to use, and only a few people understood them. But soon, computers began to appear in offices and then homes. Today, they are everywhere. Some people still say that they have never used a computer, but they probably use computers every day - they just do not realize it. This is because there are computers in so many ordinary things: cars, televisions, CD-players, washing machines.
When the first computers were built in the 1940s and 1950s, they were enormous. In fact, they were as big as a room. In 1949, the magazine Popular Mechanics made a prediction: 'One day, they said, 'computers will be really small; in fact, they will weigh less than 1.5 tonnes.' Now, computer chips can be as small as this letter O. Over the past fifty or sixty years, computers have changed much more than people thought possible.
For thousands of years, humans have needed to count. Families needed to know how many animals, how much food and how much land hey had. This information was important when people wanted to buy and sell things, and also when people died or got married. There were many different ways to count and write down the numbers. The Sumerians had three different ways: they used one for land, one for fruit and vegetables and one for animals. They could count, but they had no easy way to do calculations.
Around 1900 to 1800 ВС, the Babylonians invented a new way to count which used place values. This meant that two things decided the size of a number: the digits and their position. Today, we still use place values to count. We can write any number using only ten digits (0-9): for example, 134 means 1 x 100, 3 x 10, and 4x1. Computers also use place values when they do calculations. They only use two digits (0 and 1): for example, 11011 means 1 x 16, 1 x 8, 0 x 4, 1 x 2, and 1 x 1 (=27). Without place values, fast calculations are impossible.
Between 1000 and 500 ВС, the Babylonians invented the abacus. It used small stones which they put in lines. Each line of stones showed a different place value. To do calculations they moved stones from one line to another. Later, different kinds of abacuses were made. Some of them were made of wood and used coloured balls. (It is also possible that the abacus was first invented in China, but nobody really knows.)
Although an abacus can be very fast, it is not really a machine because it does not do calculations automatically. In the seventeenth century, people began to build calculating machines. In 1640, the French mathematician Blaise Pascal made an Arithmetic Machine. He used it to count money. During the next ten years, Pascal made fifty more machines.
In the 1670s, a German called Leibnitz continued Pascal's work and made a better machine. Leibnitz's machine was called the Step Reckoner It could do more difficult calculations than Pascal's Arithmetic Machine. Interestingly, Leibnitz's machine only used two digits (0 and 1) for doing calculations - just like modern computers! In fact, calculating machines like Leibnitz's Step Reckoner were used for the next three hundred years, until cheap computers began to appear.

1 год назад

Предмет: Русский язык, автор: Listly

Места, по которым они проезжали, не могли назваться живописными. Поля, все поля тянулись вплоть до самого небосклона, то слег- ка вздымаясь, то опускаясь; кое-где виднелись небольшие леса, и, усеянные редким и низким кустарником, вились овраги, напоминая глазу их собственное изображение на старинных планах екатерининс- ких времен. Попадались и речки с обрытыми берегами, и крошечные пруды с худыми плотинами, и деревеньки с низкими избенками под темными, часто до половины разметанными крышами, и покривившиеся молотильные сарайчики с плетенными из хвороста стенами и зевающими воротищами возле опустелых гумен, и церкви, то кирпичные с отвалившеюся кое-где штукатуркою, то деревянные с на- клонившимися крестами и разоренными кладбищами.
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По этому отрывку нужно выполнить задания:
1)Тема и основная мысль. Чьими словами передает автор эту картину
2)Стиль текста, тип речи, роль пейзажа
3)Выписать из контекста метафоры, эпитеты и др. средства речевой выразительности.
Очень прошу помочь!!

1 год назад

Предмет: Математика, автор: Katyakim220605

Составте задачу по уравнению:
(a+b):6,3
(5класс)
Срочнооооо!!!!!!!!

8 лет назад

Предмет: Математика, автор: петя181

помогите пожалуйста решить задачу от автостанции одна временно отошли в противоположные стороны два гонщика первый гонщик проехал 70 км а второй 140 км скорость 1 готика 35 км в час найдите скорость 2 гонщика

8 лет назад

Если отрезок DC= 15 см и LK=0,2⋅DC, то LK= см.

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