Предмет: Математика, автор: Sofiaaw

ШВИДКО ПЛІІЗ!!
-2 1/3 х = 7/15​

Ответы

Автор ответа: ivkevychnatali
1

Відповідь:

х=\frac{7}{15}:-\frac{31}{15}=-\frac{7}{31}

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16. Which alternatives are correct? Sometimes only one alternative is correct, and sometimes two of the alternatives are possible.
1 'What time will you be home tonight?' 'I'm not sure.I … late.'
A may be B might be C can be
(both A and B are correct)
2 I can't find the theatre tickets. They … out of my pocket.
A must have fallen B should have fallen C had to fall
3 Somebody ran in front of the car as I was driving. Fortunately I … just in time.
A could stop B could have stopped C managed to stop
4 We've got plenty of time. We ... yet.
A mustn't leave B needn't leave C don't need to leave
5 I … out but I didn't feel like it, so I stayed at home.
A could go B could have gone C must have gone
6 I'm sorry I … come to your party last week.
A couldn't come B couldn't have come C wasn't able to come
7 'What do you think of my theory?' 'I'm not sure. You … right.'
A could be B must be C might be
8 I couldn't wait for you any longer. I… , and so I went.
A must go B must have gone C had to go
9 'Do you know where Sarah is?'
'No I suppose she … shopping.'
A should have gone B may have gone C could have gone
10 At first they didn't believe me when I told them what had happened, but in the end … them that I was telling the truth.
A was able to convince B managed to convince C could convince
11 I promised I'd call Gary this evening. I ...
A mustn't forget B needn't forget C don't have to forget
12 Why did you leave without me? You ... for me.
A must have waited B had to wait C should have waited
13 Lisa called me and suggested … lunch together.
A we have B we should have C to have
14 You look nice in that jacket, but you hardly ever wear it. … it more often.
A You'd better wear
B You should wear
C You ought to wear
15 Shall I buy a car? What's your advice? What … ?
A will you do B would you do C shall you do

17. Complete the sentences using the words in brackets.
1 Don't phone them now. They…might be having… lunch. (might / have )
2 I've eaten too much. Now I feel sick. I … so much. (shouldn't / eat)
3 I wonder why Tom didn't phone me. Не ... (must / forget)
4 Why did you go home so early? You … home so early. (needn't / go)
5 You've signed the contract. It … now. (can't / change)
6 'What's Linda doing?' 'I'm not sure.' She … TV. (may / watch)
7 Laura was standing outside the cinema. She … for somebody. (must / wait)
8 He was in prison at the time that the crime was committed. Не … it. (couldn't / do)
9 Why weren't you here earlier? You … here earlier. (ought / be)
10 Why didn't you ask me to help you? I ... you. (would / help)
11 I'm surprised you weren't told that the road was dangerous. You …about it. (should / warn)
12 Gary was in a strange mood yesterday. Не … very well. (might not / feel)
37.1 Read the situations and write questions beginning Can … or Could ….
1 You're carrying a lot of things. You can't open the door yourself. There's a man standing near the door. You say to him: …Could you open the door, please?
2 You phone Kate's office, but somebody else answers. Kate isn't there. You want to leave a message for her. You say:
3 You're a tourist. You want to go to the station, but you don't know how to get there. You ask at your hotel:
4 You are in a clothes shop. You see some trousers you like and you want to try them on. You say to the shop assistant:
5 You have a car. You have to go the same way as Steve, who is on foot. You offer him a lift. You say to him:

37.2 Read the situation and write a question using the word in brackets.
1 You want to borrow your friend's bike. What do you say to him? (think) ...Do you think I could borrow your bike?...
2 You are staying at a friend's house and you would like to make some coffee. What do you say? (all right) …Is it all right if I make some coffee?...
3 You've filled in some forms in English. You want your friend to check them for you. What do you ask? (think) ...
4 You want to leave work early. What do you ask your boss? (mind) ...
5. The woman in the next room is playing music. It's very loud. You want her to turn it down. What do you say to her? (think) ...
6. You're on a train. The window is open and you're feeling cold. You'd like to close it, but first you ask the woman next to you. (OK) ...
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