Hãy viết chương trình tìm giá trị của N thỏa mãn biểu thức sau:

1+ \(\dfrac{1}{2}\)+\(\dfrac{1}{3}\)+...+\(\dfrac{1}{N}\) >a

Biết a được nhập từ bàn phím.

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EXERCISE I: Give emphasis to the underlined words, phrases or clauses :

1/ I paid a visit to Ha Long Bay in 1966.
________________________________________________
2/ The Socialist Republic of Vietnam came into being on July 2, 1976.

-_______________________________________________

3/ Mr. Green went to work in spite of his bad cold.

- ________________________________________________

4/ When I left for work this morning, it was raining hard.

- ________________________________________________

5/ I want to see the manager; I don’t want to see his assistant.

- ________________________________________________

6/ The flight was put off because the weather was too bad.

- ________________________________________________

7/ I met Mary at the party last night.

- ________________________________________________

8/ The words do not matter so much as the way you say them.

- ________________________________________________

9/ They couldn’t solve this serious problem.

- ________________________________________________

10/ Did you start the flight or was it someone else ?
________________________________________________

EXERCISE II : Put the underlined words or phrases at the front position :

1/ He has never in his life been so happy.

- ________________________________________________

2/ He managed to pass the examination only by hard work.

- ________________________________________________

3/ I had hardly got into the bathroom when the telephone rang.

- ________________________________________________

4/ The ball went over the fence and into our neighbour’s garden.

- ________________________________________________

5/ The doctor was so angry that none of the nurses dared to say a word.

- ________________________________________________

6/ I can’t explain the situation in another way.

- ________________________________________________

7/ He had no sooner arrived than he began to make trouble.

- ________________________________________________

8/ We have made real progress only within the last fifty years.

- ________________________________________________

9/ If the union were to call a strike, the situation would become very difficult.

- ________________________________________________

10/ This instrument is not only expensive but also useless.

EXERCISE III: Rewrite the following sentences

1/ We have never seen such a clean and tidy house before.

Never before __________________________________________

2/ Rarely does she come to see me now.

She _________________________________________________

3/ He didn’t realize he had lost his wallet until he got home.

Not until ____________________________________________

4/ My father no longer works for this company.

No longer ____________________________________________

5/ So suspicious did he become that he didn’t believe whatever she had said.

He __________________________________________________

6/ Not only did he refuse to help me but he also made fun of me.

He __________________________________________________

7/ This switch mustn’t be touched on any account.

On no account __________________________________________

8/ They know little about it.

Little _________________________________________________

9/ A great castle stood directly in front of them.

In front of them __________________________________________

10/ Were I in your place, I would refuse his invitation.

If ____________________________________________________

11/ We met him just a moment ago.

It was just ______________________________________________

12/ Many a time did he tell her that he loved her.

He ____________________________________________________

13/ An enormous frog sat on the grass.

On ____________________________________________________

14/ Please turn down the radio.

Do ____________________________________________________

15/ She wanted to buy a blue hat.

She did ________________________________________________

Tìm hệ số của x⁴ trong khai triển thành đa thức (4+3x+2x²)(2+3x)⁶

Cho tập A = { 0; 2; 4; 5; 6; 8; 9}. Từ tập A lập được bao nhiêu số:

a) Gồm 5 chữ số khác nhau và lớn hơn 50000

b) Gồm 6 chữ số khác nhau sao cho số đứng ở vị trí thứ ba chia hết cho 5 và số đứng cuối lẻ.

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