Taskl. Read the text are the sentences TRUE or FALSE Natural Diasters
Natural disasters like earthquakes, tornado tsunami and floods happen more frequently nowadays. There are
many reasons why they occur but the man one is related to human activity on Earth which ofte has a negative
impact on our environment All kinds of disasters are usually very damaging Many dwellings, roads and
whole streets and cities are used. The sumber of victims usually temties as hundreds or even thousands of
people get injured or die in disasters However, each disaster has a diferent nature For example, an earthquake
is the result of the tectonic plates soment which leads to the shaking of a certain mea on land Earthquakes
destroy buildings and people all become victims because they get stuck or lalled under the table Tomada
is also a natural disaster which looks like mormous columns of the wind which lifts cars, bicycles fumi
and many other things. It is also called states and it can be very dangerous if touches the surface of the ground
or water Flood in its appear ons burst the banks Most extended floods damage cities and was
away whole populated places Tumis mother natural disaster which arises as a series of huge
was
by underwearthquake Thus the area satural disasters which are dangerous for all of us we should
becada anda menceder sot to die with it
Eco Natural disappear swadays
True
Theofanas se people's activity
False
GRAR​

решение. 1. ri=2*r; rii=r/2; ri/rii=4; не надо ни о какой площади сечения говорить. два куска проволоки содинили последовательно, получили ri=2*r; два куска той же проволоки соединили параллельно, получили rii=r/2; ну, а теперь раздели первое на второе!

а теперь общий случай: ri=r*n; rii=r/n; ri/rii=n^2; кусок проволоки разрезали на n одинаковых кусков. сначала эти куски соединяют последовательно: ri=r*n; затем соединяют параллельно rii=r/n; ну и дели первое на второе и делай выводы.

1) pupils must  learn all subjects  hard and  regularly  at school.Ученики должны  учить все предметы усердно и постоянно в школе

2) There is a  blackboard  in our classroom. We can write on it. В нашем классе есть доска, Мы можем на ней писать

3) There are short  breaks between the lessons. Между уроками есть короткие перемены

4)During  the lesson we often must  answer  the teacher`s questions. Во время урока мы часто должны отвечать на вопросы учителя

5) we must  read  English texts  during our English lesson. Мы должны читать английские тексты  во время наших уроков

6) We seldom  write    and  speak  Russian аt our  English. We usually translate from  English  into  Russian at home. Мы редко пишем и говорим по- русски  на наших уроках, Мы обычно переводим с  английского на  русский дома

7)We must  always  retell  English stories to the teacher  at  the lesson. Мы должны всегда пересказывать  английские истории  учителю на уроке

8)I don`t like to learn English poems by heart. Я не люблю учить английские поэмы наизусть

9) During  our Literature lesson we often discuss a lot of problems. Во время  нашего урока  литературы мы часто обсуждаем множество проблем