ta có :

\(A=\dfrac{10^{11}-1}{10^{12}-1}\\ 10A=\dfrac{10^{12}-10}{10^{12}-1}=1-\dfrac{9}{10^{12}-1}\\ =>10A< 1\\ B=\dfrac{10^{10}+1}{10^{11}+1}\\ 10B=\dfrac{10^{11}+10}{10^{11}+1}=1+\dfrac{9}{10^{11}+1}\\ =>10B>1\)

=> 10A<10B =>A<B

vậy A bé hơn B

In ra màn hình -> dùng lệnh write hoặc writeln

-> For i:=1 to 10 do writeln(diem[i]);

Những từ phát âm /e/ và /ei/ là:

Chúc bạn học tốt!

trả lời bên dưới rồi nhé không cần đăng lại

Cho các câu lệnh sau chỉ ra câu lệnh đúng:

A: for i:=1 to 10; do x:=x+1;

B: for i:=1 to 10 do x:=x+1;

C: for i:=10 to 1 do x:=x+1;

D: for i=10 to 1 do x:=x+1;

Cho các câu lệnh sau chỉ ra câu lệnh đúng:

A: for i:=1 to 10; do x:=x+1;

B: for i:=1 to 10 do x:=x+1;

C: for i:=10 to 1 do x:=x+1;

D: for i=10 to 1 do x:=x+1;

Chọn B nhé bạn

If there ___________ fewer cars on the road, there would be less accident. *

a.be

b are

c is

d were

I started working here 10 years ago. *

a I have worked here for 10 years.

b I haven't worked here since 10 years.

c I have started working here 10 years ago.

d I have started to work here 10 years ago.

She wouldn't go out if she _____________ the weather forecast. *

a is listening to

b listened

c listens to

d listened to

We reminded Lily___________ late for our appointment the next day. *

a not to be

b to don’t be

c to be not

d don’t be

Although the weather was cold, the fooball match was not canceled. *

a Despite of cold weather, the fooball match was not canceled.

b Inspite cold weather, the fooball match was not canceled.

c Despite being cold weather, the fooball match was not canceled.

d Despite the cold weather, the fooball match was not canceled.

The facsimile _____________by Alexander Bain in 1843. *

a invented

b has invented

c was invented

d has been invented

Choose the word whose main stressed syllable is placed differently from that of the other in each group *

a interactive

b attractive

c competitive

d activity

Choose the word whose main stressed syllable is placed differently from that of the other in each group. *

a connection

b exciting

c transitive

d impressive

Thanks to the weather forecast, many residents __________ the town before the storm swept through it. *

a had left

b will left

c have left

d left

“What about going for a walk?” said Peter. *

a Peter suggested go for a walk.

b Peter suggested going for a walk.

c  Peter suggested to going for a walk.

d Peter suggested to go for a walk.

I don’t have enough time, so I can’t go on holiday this summer. *

a. If I have enough time, I can go on holiday this summer.

b. Unless I haven’t enough time, I can’t go on holiday this summer.

c. If I haven’t enough time, I can go on holiday this summer.

d. If I have enough time, I can’t go on holiday this summer.

They discussed these pollution problems last month. *

a These pollution problems were discussed last month by them.

b These pollution problems were discussed last month.

c These pollution problems was discussed last month by them.

d These pollution problems was discussed last month.

The shirt is so expensive that I can’t buy it. *

a The shirt is too expensive for me to buy.

b The shirt is too expensive for me buying it.

c It is such expensive shirt that I can buy it.

d The shirt isn’t cheap enough for me to buy it.

Choose the word whose end of /ed/ is pronounced differently from that of the others. *

a occurred

b existed

c warned

d claimed

–“Could you bring me some water?" –“___________” *

a Certainly, sir

b No, I can't

c Yes, I can

d I don't want to

Choose the word whose main stressed syllable is placed differently from that of the other in each group. *

a emigration

b introduction

c stationery

d exhibition

Choose the word whose underlined part is pronounced differently from that of the others. *

a appear

b heavy

c health

d ready

We ___________ with each other by mobile phone in 2050. *

a aren’t going to communicate

b won’t be communicating

c aren’t communicating

d haven’t communicated

The last time when I saw her was three years ago. *

a I have not seen her for three years.

b I have often seen her for the last three years.

c I saw her three years ago and will never meet her again.

d About three years ago, I used to meet her.

I ___________ soccer with my friends this time next weekend. *

a are playing

b am going to play

c was playing

d will be playing

–“Would you like a coffee?” –“___________” *

a Not at all

b Yes, let’s

c Yes, please

d Yes, I would

Most / us / use / energy. *

a Most of us use too many energy.

b Most us use too many energy.

c Most us use too much energy.

d Most of us use too much energy.

Teacher / ask / me / if / speak / English / fluent /. *

a The teacher asks me if I speak an English fluent.

b The teacher asked me if I spoke English fluently.

c The teacher asked me if do I speak English fluently.

d The teacher asks me if I can speak English fluent.

Choose the word whose main stressed syllable is placed differently from that of the other in each group. *

a interaction

b practicality

c geography

d ideology

I / hope / have / good time / together / see you soon *

a I hope we will have a good time with together and I will see you soon.

b I hope us will have a good time together. See you soon.

c I hope us to have a good time together, and seeing you soon.

d I hope we will have a good time together. See you soon.

He said he might _____________ tomorrow. *

a come

b came

c coming

d comes

Elie asked Stand___________ to look at the new catalogue. *

a if he wanted

b do you want

c did he want

d whether he wants

Lena enjoys _____________ on the phone with her friends. *

a chats

b chatted

c chatting

d chat

The teacher said we___________ a week off on the occasion of the International Labor Day. *

a would have

b didn’t have

c have

d will have

All the houses in the area_________immediately. *

a have to rebuild

b has to rebuilt

c had to rebuilt

d have to be rebuilt

Lien told me that ___________a biology teacher. *

a she wanted becoming

b she wants to become

c she will become

d she wanted to become

Don't worry! I _____________ you to solve the problem. *

a helped

b will help

c helping

d help

The boy/ old/ enough/ drive/ car *

a The boy is old enough drive a car

b The boy is enough old to drive a car

c The boy is old enough to drive a car

d The boy is old enough for drive a car

Driving on the left is very dangerous in our country. *

a It very dangerous to drive on the left in our country.

b It is very dangerous driving on the left in our country.

c It is very dangerous to drive on the left in our country.

d It is very dangerous to driving on the left in our country.

Lan asked me if I___________that exciting baseball match on TV the previous day. *

a have watched

b was watching

c had watched

d watched

She asked me if I___________a laptop computer the following day. *

a buy

b would buy

c will buy

d bought

Choose the word whose ended of /s/ is pronounced differently from that of the others. *

a rides

b leaves

c drinks

d travels

Honda motorbikes___________in Viet Nam every year. *

a will produce

b produce

c are produced

d would be produced

After three hours of considering, we have decided ___________the final decision. *

a to making

b to make

c make

d making

H=\(\frac{5}{28}\) + \(\frac{5}{70}\) + \(\frac{5}{130}\) +...+ \(\frac{5}{700}\)

H= \(\frac{5}{4.7}\) + \(\frac{5}{7.10}\) + \(\frac{5}{10.13}\) +...+\(\frac{5}{25.28}\)

H= \(\frac{5}{3}\) (\(\frac{1}{4}\) - \(\frac{1}{7}\) + \(\frac{1}{7}\) - \(\frac{1}{10}\) + \(\frac{1}{10}\) - \(\frac{1}{13}\) +...+ \(\frac{1}{25}\) - \(\frac{1}{28}\))

H= \(\frac{5}{3}\) (\(\frac{1}{4}\) + \(\frac{1}{7}\) - \(\frac{1}{7}\) + \(\frac{1}{10}\) - \(\frac{1}{10}\)+...+ \(\frac{1}{25}\)- \(\frac{1}{25}\) - \(\frac{1}{28}\))

H= \(\frac{5}{3}\) ( \(\frac{1}{4}\) - \(\frac{1}{28}\)) = \(\frac{5}{3}\) . \(\frac{3}{14}\)= \(\frac{5}{14}\)

C, F?

C