Предмет: Математика, автор: alinkasuzdalts

Помогите пожалуйста: Найдите корни уравнения:(4,9+3,5х)(7х-2,8)=0

Ответы

Автор ответа: СоцГум

х в твоем уравнении будет равен 0.4

alinkasuzdalts: а дальше?

СоцГум: что дальше? решение нужно было что-ли?

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Test 4
1. If I ... some fish, will you cook it for me?
a) will catch c) caught
b) catch d) am catching
2. She said that she ... her present flat. She tried to find
another one.
a) doesn't like c) didn't like
b) won't like d) likes
3.1 saw you yesterday from the bus. Where ... you ... at that
time?
a) was hurrying c) had hurried
b) were hurrying d) did hurry
4.1 found that everything I said on the phone ... to the police.
a) report c) was reported
b) is reported d) had been reported
5. When I speak Italian, all the others in the class ... at me as I don't know the language well.
a) laughed c) will laugh
b) was laughing d) laugh
6. He ... in the Army for eighteen months. This is his last month.
a) serves c) has been serving
b) is serving d) have served
7. Don't make noise: the children ... to sleep.
a) try c) will try
b) is trying d) are trying
8. A new museum ... in the city. What a beautiful building it will be!
a) was being built c) is built
b) is being built d) builds
9. Two terrorists ... in New York some days ago.
a) are arrested c) were arrested
b) have been arrested d) will be arrested
10.1 ... understand this letter. Will you translate it for me?
a) mustn't c) may not
b) can't d) shouldn't
11. Diana's parents don't let her go to late-night disco. She ... be at home at 9 o'clock in the evening.
a) must c) may
b) can d) have to
12. Henry ... apologize for his bad behaviour yesterday.
a) have to c) had to
b) may d) is to
13. The children studied hard, and as a result they passed the exams ... of all.
a) good c) best
b) better d) the best
14. This is ... film I've ever seen.
a) more interesting c) most interesting
b) the most interesting d) not interesting
15. ... old, ... sick, ... unemployed need our special care.
a) - c) the
b) an d)everybody
16. Someone who saw ... robbery called the-police.
a) - c)the
b) a d)those
17. According to this song ... we need is love.
a) all c) each
b) every d) some
18. We wished the bride and groom happiness in ... new life together.
a) there c) theirs
b) their d) these
19. Excuse me, but does this umbrella belong ... you?
a) to c) at
b) for d) with
20. I listened to the radio every day to know the weather forecast but I can never rely ... it.
a) at c) in
b) to d) on
Test 5
1.1 knew that I ... her somewhere before.
a) saw c) would see
b) had seen d) has seen
2. When I finally found the house, I knocked at the door but ... the answer.
a) don't hear c) didn't hear
b) hasn't heard d) heard
3. I went out into the garden to fetch my bike, but found that someone ... it.
a) stole it c) has stolen
b) would steal d) had stolen
4. When I... for the keys, I remembered that I had left them at home.
a) looked c) had been looking
b) was looking d) look
5.1 have been working for the bank for a year already, but I ... to change my job.
a) decided c) has decided
b) have decided d) decide
6. They spoke so quickly that I ... what they were speaking about.
a) not understand c) didn't understand
b) don't understand d) hadn't understood
7. Yesterday our flight ... because of the fog.
a) cancelled c) had been cancelled
b) was cancelled d) has been cancelled
8.1 couldn't open the office door because someone ... it.
a) lock c) had locked
b)locked d)would lock
9. As soon as you ... me, I will contact you.
a) calls c) called
b) will call d) call
10.1 ... him since he started working here.
a) have never trusted c) trusted
b) had never trusted d) trust
11. Mary will be ready soon. She ... coffee at the moment.
a) has c) was having
b) have d) is having
12. If we ... late for the class, our teacher will be angry with us.
a) is c) will be
b) were d) are
13. We ... in the sunshine for about half an hour when I suddenly felt sick.
a) have been sitting c) sat
b) were sitting d) had been sitting
14. We were disappointed as the film was ... than we expected.
a) entertaining c) most entertaining
b) less entertaining d) entertaining
15. We usually ask our teacher to explain ... difficult problems to us.
a) the c) a
b) - d) this
16. Playing ... guitar is an interesting hobby.
a) - c) the
b) a d) mine
17. Our city is famous for ... beautiful ancient buildings.
a) its c) it's
b) it d) his
18. Her hair is long and fair. Everybody admires ... .
a) them c) they
b) it d) its
19. You are very good ... dealing with people.
a) in c) on
b) at d) about
20. Last summer our neighbours decided to drive to Scotland ... a short holiday.
a) at c) on
b) to d) for

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