Khinh Yên
Vài giây trước

 

Supply the correct form and tense the verbs in the brackets.
1. She (have)_____has______ coffee for breakfast every morning.
2. This is my house. ~How long_____have___ you (live)____lived_____ here? ~I (live)_______have lived_______ here since 1970.
3. There (be)_______will be____ 20 rooms in my future house.
4. Be careful! The baby (sleep) __________is sleeping_________.
5. If he (eat)eats all that he will be ill
6. I ( meet )______met_______her at the movie theater last night.
7. My mother ( make ) ________is making___ a dress now.
8. Two years ago, she ( teach ) ____taught_____at a village school.
9. What ___did_____you (do) ____do____ yesterday morning?
10. We (not travel ) ________won't travel_____to Hue next month.
11. She never ( stay ) _____stays________up late at night.
12. My mother ( plant ) ______is planting_____ flowers in the garden at the moment.
13. __will_____Minh ( go ) _____go___ to the dentist tomorrow morning?
14. Michael ( play) ______has played_______the piano since he ( be ) _________was____three.
15. If we leave the car here it (not be) ___won't be______in anybody's way.
16. He'll be late for the train if he (not start) ____doesn't start___ at once.
17. If you come late they (not let) _____won't let____you in.
18. If he (go) _____goes__ on telling lies nobody will believe a word he says.
19. If he (work) ____works_____hard today, can he have a holiday tomorrow?

 

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Khánh Đan
4 phút trước

Vì R1 nt R2 ⇒ I1 = I2 = I = 0,36 (A)

\(\Rightarrow\left\{{}\begin{matrix}U_1=0,36.15=5,4\left(V\right)\\U_2=0,36.10=3,6\left(V\right)\end{matrix}\right.\)

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Lazyboy
4 phút trước

Use the suggested words and phrases to make complete sentences. (10 pts)

1. Margaret/ not/ apply/ job/ library/ and/ regret it/ now 

Margater didn't apply for the job in the library and he regrets it now

2. Unless/ you/ hurry/ you/ not/ able/ catch/ train.

Unless you hurry, you won't be able to catch the train

3. Castle/ build/ 17th century? 

Was this castle built in the 17th century?

4. Children/ very fond/ play/ rain. 

Children are very fond of playing in the rain

5. He/ most intelligent boy/ I/ ever/ meet. 

He is the most intelligent boy I have ever met

6. He/ now/ work/ mechanic/ car factory. 

He is now working as a mechanic in a car factory

7. You/ like/ spend/ free time/ play badminton/ me?

Would you like to spend your free time playing badminton with me

8. If/ he/ give up/ smoke/ health/ become/ better/ better. 

If he gives up smoking, his health will become better and better

9. We/ bored/ eat/ same food/ every day. 

We are bored with eating the same food everyday

10. They/ decide/ go/ beach/although/ it/ rain/ hard.

They decided to go to the beach although it was raining hard

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Khinh Yên
3 phút trước

Use the suggested words and phrases to make complete sentences. (10 pts)

1. Margaret/ not/ apply/ job/ library/ and/ regret it/ now Maria didn’t apply for the job in the library and regrets it now

2. Unless/ you/ hurry/ you/ not/ able/ catch/ train. unless you hurry ,we won't be able to catch the train

3. Castle/ build/ 17th century? Was the castle built in 17th century?

4. Children/ very fond/ play/ rain. The children are very fond of playing in the rain

5. He/ most intelligent boy/ I/ ever/ meet. He is the most intelligent boy I’ve ever met. 

6. He/ now/ work/ mechanic/ car factory. He is now working as a mechanic in a car factory

7. You/ like/ spend/ free time/ play badminton/ me? Do you like spending your free time playing badminton with me?

8. If/ he/ give up/ smoke/ health/ become/ better/ better. If he gives up smoking, his health will become better and better

9. We/ bored/ eat/ same food/ every day. We are bored with eating the same food everyday

10. They/ decide/ go/ beach/although/ it/ rain/ hard. They decided to go to the beach although it was raining hard

 

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Hiền Nguyễn

Finish the second sentence in such a way that it means the same as the original one. (10 pts)
1. I am really sorry I didn’t attend the meeting yesterday.
I really wish ___________________________________________________________________________________
2. It was so late that we couldn’t finish the work.
It was not______________________________________________________________________________________
3. He didn’t have enough money, so he couldn’t buy the big house.
If ____________________________________________________________________________________________
4. I haven’t seen her for over two months now.
It’s ___________________________________________________________________________________________
5. My mother asked me whether I had slept well the night before.
My mother asked, “ ______________________________________________________________________________
6. He failed to persuade his father to lend him his motorbike.
He didn't ______________________________________________________________________________________
7. Although his leg was broken he managed to get out of the burning house.
In spite________________________________________________________________________________________
8. Please do not chew gum in the lobby.
Would you mind ________________________________________________________________________________
9. I should really be going now.
It’s ___________________________________________________________________________________________
10. The snow was so heavy that all the planes couldn’t take off.
The heavy snow ________________________________________________________________________________

 

Lazyboy
9 phút trước

1. I am really sorry I didn’t attend the meeting yesterday.
I really wish ___I had attended the meeting yesterday. ________________________________________________________________________________
2. It was so late that we couldn’t finish the work.
It was not_____early enough for us to finish the work. _________________________________________________________________________________
3. He didn’t have enough money, so he couldn’t buy the big house.
If ______he had had enough money, he could have bought the big house. ______________________________________________________________________________________
4. I haven’t seen her for over two months now.
It’s ______2 months since I last saw her_____________________________________________________________________________________
5. My mother asked me whether I had slept well the night before.
My mother asked, “ ______Did you sleep well last night"________________________________________________________________________
6. He failed to persuade his father to lend him his motorbike.
He didn't _____succeed in persuading his father to lend him his motorbike. _________________________________________________________________________________
7. Although his leg was broken he managed to get out of the burning house.
In spite______of his broken leg,he managed to get out of the burning house. __________________________________________________________________________________
8. Please do not chew gum in the lobby.
Would you mind __________not chewing gum in the lobby?______________________________________________________________________
9. I should really be going now.
It’s ______time I went _____________________________________________________________________________________
10. The snow was so heavy that all the planes couldn’t take off.
The heavy snow _______prevented all the planes from taking off_________________________________________________________________________

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Akai Haruma
9 phút trước

Lời giải:
Xét số hạng tổng quát: 

\(\frac{\sqrt{n+1}-\sqrt{n}}{n+(n+1)}< \frac{\sqrt{n+1}-\sqrt{n}}{2\sqrt{n(n+1)}}=\frac{1}{2}(\frac{1}{\sqrt{n}}-\frac{1}{\sqrt{n+1}})\) theo BĐT Cô-si.

Do đó:
\(x< \frac{1}{2}\left[\frac{1}{\sqrt{1}}-\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{2}}-\frac{1}{\sqrt{3}}+....+\frac{1}{\sqrt{99}}-\frac{1}{\sqrt{100}}\right]=\frac{1}{2}(1-\frac{1}{\sqrt{100}})< \frac{1}{2}\)

Ta có đpcm.

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Lazyboy
17 phút trước

1 had

2 washes

3 needs

4 don't go

5 makes

6 is

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Khinh Yên
17 phút trước

 

Supply the correct form and tense the verbs in the brackets.
1. I (have)___had_ a little trouble with my car last week.
2. If he (wash) ____washes___ my car I'll give him $10.
3. If she (need) ___needs______a radio she can borrow mine.
4. If you (not go) ____don't go_____away I'll send for the police.
5. I'll be very angry if he (make) __makes_______any more mistakes.
6. If he (be) ____is___ late we'll go without him.

 

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Khoá học trên OLM của Đại học Sư phạm HN