Предмет: Алгебра, автор: Аноним

СРОЧНО! Вычислите
2√x+ 5√y-3√y
При √x+ √y=4

Ответы

Автор ответа: yanadoroshenko03
1

2√x+2√y= 2(√x+√y)=2*4=8

Автор ответа: Also1987
1

Ответ:

Объяснение:

2корень х+ 5корень у -3корень у=

2корень х+2корень у=

2(корень х+корень у)=2×4=8

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Read the text 1.
Colchester is a small university town 80 km to the northeast of London, approximately 45 minutes
by train. It is a very beautiful town, and students are very happy here because there are so many facilities and
good entertainment. It is very famous for being the oldest town in England.
There is the only English Language School in Colchester, and it was founded thirty years ago by
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multimedia Centre with free e-mail facilities, a library and a listening Centre, the Internet access, a restaurant
and a beautiful garden here. They also arrange course for children and young people in homestay and in
residential accommodation.
Courses are organized at seven levels. The maximum group size is 13 (average is 10). Each level
lasts 8 weeks, but you can stay for only two weeks if you want.
In summer many students stay for two or three weeks. You can start on any Monday as the course is
organized in weekly units. All lessons last 50 minutes. You can choose options in Business English or
International Affairs. They also organize examination courses and a course that is called English for Academic
Study for students who want to learn English for studies. Some students also choose to have extra private
lessons.
There is a free daily social program: clubs, tea parties, etc. Young people can have fun at a free
party every Thursday evening.
Task 1.1. Read the statements and decide if they are TRUE or FALSE according to what the text says.
1. Colchester English Language School was founded 30 years ago by Oxford University Press
2. Colchester is the oldest university town in England.
3. Each of seven course level lasts 8 weeks.
4. You can start on any Monday and stay at courses for two or three weeks.
5. Children and young people can learn English in homestay and in residential accommodation.
6. Every Thursday evening young people enjoy a free party at English Language School in Colchester.
Task 1.2. For question (1 – 4) choose the answer (A, B, C or D) which you think fits best according to
the text.
1. Colchester is a small university town 80 km __________

A to the northwest of London
B to the towards to London
C to the northeast of London
D to the east of London

2. Students are very happy here because______________
A there are a lot of facilities
B there is a good atmosphere
C there are a lot of free parties
D they can play at the band here

3. The writer says that some students also choose to have____________
A extra single lesson
B extra private lessons
C just lessons
D lessons without teachers
4. The word ―arrange” in line 7 means
A to settle down
B to organize
C to put
D some disposition

Task 1.3. For question (1 – 4) choose the answer (A, B, C or D) which you think fits best according to
the text.
1. All lessons last________
A an hour C an hour without ten minutes
B a half an hour D a quarter of an hour
2. Colchester is a small university town________
A less than one hundred km to the northeast of London
B 50 km to the northeast of London
C more than one hundred km to the northeast of London

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3. The maximum group size in Colchester University is__________
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