Предмет: Математика, автор: Ксения1604

Реши задачу, составив уравнения. Из двух городов вышли одновременно навстречу друг другу поезда и встретились через 18 часов. Определи скорость каждого поезда, если расстояние между городами 1620 км, а скорость одного поезда на 10 км больше, у другого.

Ответы

Автор ответа: VekaSolnce
0

пусть х км/ч-скорость второго поезда, тогда скорость первого (х+10)км/ч

(х+(х+10) )*18=1620

 

(2х+10)*18=1620

  2х+10=1620:18

 2х+10 =90

 2х=80

х=40 км/ч - скорость второго поезда

 

40+10=50 км/ч - скорость второго поезда 

Автор ответа: patroshka
0

x+x+10*18=1620

2x+10*18=1620

2х+10=90

2х=80

x=40 км/ч скорость одного

40+10=50км/ч скорость другого

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GRADE 8
Tasks for the Summative Assessment for the term 1

I. Reading.
Read and mark sentences TRUE or FALSE .
Topic "Internet"
We can’t imagine our lives without the internet, computers and other gadgets, which unite all the users of World Wide Web. The internet is a very important source of information for people. Nowadays, you can find there any necessary information not only for education, or work but also for entertainment. Nowadays people communicate with each other, using the internet, social networks are very popular and people can’t imagine their lives without online communication.
But we must say, that using the internet has both advantages and disadvantages. The internet influences us very much, especially young people. There exist dozens of diseases that are the result of playing computer games, and spending too much time in networks. We do sport and walk less and less and spend time, sitting at a computer. Also, using a computer, there exist a possibility to become a victim of online fraudsters, which can try to steal your money.
Internet became so popular nowadays because people can use it not only at home, in the personal computer, but also they can go online, using their mobile web. So we can get any information we want, no matter, whether we are at home or not. And in addition, the price of such mobile web is not so expensive.

Task 1. Find out if it is TRUE or FALSE from text.
1. We can’t imagine our lives without the internet. False /True
2. The internet isn’t a very important source of information for people. True /False
3. Internet addiction exposes people to various diseases. False /True
4. Internet became so popular. False /True
5. So we can’t get any information from the Internet. True / False
Correct answer – 1 point
Total – 5 points

II. Writing
Task 1. Fill in the gaps with
A something, B nothing C some someone D nobody E anything
0 – Someone is sitting at the train station,
but there aren’t trains and the café is closed,

1 so she can’t get …. to drink.
2 there is …. to do and
3 …. to talk
4 there are just … birds walking around,
5 looking … to eat
Correct answer – 1 point
Total – 5 points

Task 2. Put the verbs from brackets into the Present Perfect form. Sentences can be affirmative, negative, or interrogative.

For example: I never … (be) to Australia. – I have never been to Australia. (Я никогда не был в Австралии.)
He … (pass) the exam? – Has he passed the exam? (Он сдал экзамен?)
1. We just … (meet) an American actor.
2. Your husband … (sell) the house?
3. I … (not start) my new job yet.
4. You … (be) to New York before?
5. Tom … ever (visit) Disneyland?
Correct answer – 1 point
Total – 5 points


Total marks: 15