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23 tháng 7 2020

Một giờ người thứ nhất làm được \(1:\frac{2}{5}\) = \(\frac{5}{2}\left(cv\right)\)

=> 12 min người thứ nhất làm được \(\frac{5}{2}.\frac{1}{5}\)=\(\frac{1}{2}\left(cv\right)\)

Số phần công việc còn lại: \(1-\frac{1}{2}=\frac{1}{2}\)

Người thứ hai làm một mình hết: \(1:[(\frac{1}{2}:\frac{1}{9})-\frac{5}{2}]\) =\(\frac{1}{2}\) (h)

AH
Akai Haruma
Giáo viên
27 tháng 7 2020

Cái từ "dights" có vẻ như nên thay bằng "digits"

Có thể dùng phương pháp loại trừ

Nếu đáp án A đúng thì số 1 đã được đặt đúng vị trí (trái với dữ kiện đầu tiên)

Nếu đáp án B đúng thì có nghĩa chỉ có số 4 được đặt đúng vị trí (trái với điều kiện thứ hai)

Nếu đáp án D đúng thì có nghĩa chỉ có số 4 được đặt đúng vị trí (trái với điều kiện thứ hai)

Như vậy chỉ có đáp án C đúng. Hai số được đặt đúng vị trí là $3$ và $2$. Hai cặp số đúng là $41$ và $32$

II/ Read the following passage and choose the best answer each of the questions.Coca- Cola is enjoyed all over the world. 1.6 billion gallons are sold every year, in over onehundred and sixty countries. The drink was invented by Dr John Pemberton in Atlanta, on 8 May1886, but it was given the name Coca-Cola by his partner, Frank Robinson. In the first year, only ninedrinks a day were sold. The business was bought by a man called Asa Candler in 1888, and the firstfactory was opened in Dallas,...
Đọc tiếp

II/ Read the following passage and choose the best answer each of the questions.
Coca- Cola is enjoyed all over the world. 1.6 billion gallons are sold every year, in over one
hundred and sixty countries. The drink was invented by Dr John Pemberton in Atlanta, on 8 May
1886, but it was given the name Coca-Cola by his partner, Frank Robinson. In the first year, only nine
drinks a day were sold. The business was bought by a man called Asa Candler in 1888, and the first
factory was opened in Dallas, Texas, in 1895. Coca- Cola is still made there. Billions of bottles and
cans have been produced since 1895.
1. The one who invented Coca Cola was ..................
A. Dr John Pemberton                   B. Frank Robinson
C. Asa Candler                               D. Dallas

2. What does the word “it” in line 3 refer to?
A. the world B. gallon C. country D. the drink
3. The first Coca Cola company was opened...................
A. in 1886 B. in 1888 C. in 1895 D. since 1895
4. Nowadays, Coca Cola is sold ........................
A. all over the world          B. in more than 160 countries
C. everywhere                   D. all are correct

5. Which of the following is not true?
A. Every year, 1.6 billion gallons of Coca Cola are sold.
B. Coca- Cola is still produced in Dallas.
C. Nowadays, people don’t want to buy Coca – Cola any more.
D. At first, people didn’t like Coca- Cola very much.

1
I : Choose the word whose underlined part is pronced differently from the others.1. A. health B. appear C. ready D. heavy2. A. tidal B. sight C. mineral D. describe3. A. though B. throw C. throught D. thoughtII: Choose the best answer among A,B,C or D.1. Tam ................ go fishing with his brother when he was young.A. used to B. is used to C. has used to D. was used to2. I don't know what to do this evening. what about ................... to the movise?A. go B. to go C. going D. goes3. I...
Đọc tiếp

I : Choose the word whose underlined part is pronced differently from the others.

1. A. health B. appear C. ready D. heavy

2. A. tidal B. sight C. mineral D. describe

3. A. though B. throw C. throught D. thought

II: Choose the best answer among A,B,C or D.

1. Tam ................ go fishing with his brother when he was young.

A. used to B. is used to C. has used to D. was used to

2. I don't know what to do this evening. what about ................... to the movise?

A. go B. to go C. going D. goes

3. I don't like doing the . ............... , especially cleaning the windows.

A. homework B. housework C. job D. occupation

4. My favorite . ............... is literature.

A. play B. game C. subject D. activity

5. My mother is very . ................... at cooking.

A. well B. good C. popular D. famouse

III: Give the correct from of the wrods in brackets to complete sentences.

1. Many ____________ families have to live in tents. (home)

2. He was very __________ of the work he had done.(pride)

3. Freedom of ___________ is one of the fundamental rights.(speak)

4. His sense of ___________ him from other students.(humorous)

IV: Give the correct form/ tense of the verbs.

1. They asked us (not go) ......... out alone at night.

2. The children were excited about (open) .......... their presents.

3. She .......... (just have) dinner.

4. My brother (walk) ............ down the street when it began to rain.

V: Complete the second sentence so that it has a similar meaning to the first one.

1. '' How much do you think it will cost? '' he said to me.

- He asked me____________________________________________ .

2. It takes minh 2 hours to do his homework every day.

- Minh spends ____________________________________________ .

3. I am sorry I called him a liar.

- I wish _________________________________________________ .

4. I'm sorry I don't live near my work.

- I wish ________________________________________________ .

5. I am sorry I didn't book a seat.

- I wish _________________________________________________ .

4
29 tháng 7 2017

Đây là chỗ để học toán chứ ko phải để học tiếng anh

29 tháng 7 2017

I

1.B

2.C

3.A

II

1.A , Used to

2.C Going

3.B .Housework 

4.C. Subject

5.B. Good 

III.

1. Many _homeless____ families have to live in tents

2. He was very _proud____ of the work he had done.

3. Freedom of _____speech__ is one of the fundamental rights.

4. His sense of __humor__ him from other students.

IV: Give the correct form/ tense of the verbs.

1. They asked us (not go) ...not to go... out alone at night.

2. The children were excited about (open) ..opening........ their presents.

3. She ..has just had........ (just have) dinner.

4. ko bk

V: Complete the second sentence so that it has a similar meaning to the first one.

1. '' How much do you think it will cost? '' he said to me.

- He asked me_how much I thought it would cost_

2. It takes minh 2 hours to do his homework every day.

- Minh spends _2 hours doing his homework every day

3,4,5 ko bk. Chỉ bk chừng đó thôi

Rewrite the sentences without changing their meanings. 1.Who cleaned this car this afternoon?(cleaned) _________________________________________________ 2.They said:"We can't talk to her if she doesen't apologise to us for her bad behaviour." ___________________________________________________ 3.He has a number of relatives living nearly,but he never visits them(even though) ______________________________________________________ 4.Be careful or you'll fall of your...
Đọc tiếp

Rewrite the sentences without changing their meanings.

1.Who cleaned this car this afternoon?(cleaned)

_________________________________________________

2.They said:"We can't talk to her if she doesen't apologise to us for her bad behaviour."

___________________________________________________

3.He has a number of relatives living nearly,but he never visits them(even though)

______________________________________________________

4.Be careful or you'll fall of your bike.

____________________________________________________

5.Our teacher is always a careful driver.(drives)

__________________________________________

6.Mr Tam went to work by car some years ago,but now he cycles.(used)

_________________________________________

7.Road users should obey traffic rules strictly.(obeyed)

___________________________________________________

8.My mother washed clothes by hand in the past,but she no longer does it now.(used)

_________________________________________________________

9.Because Mr Tam was seriously ill last night,he didn't join our party.

_____________________________________________________

10.Despite the rainy wheather tonight,we dicided to go out together.

Although________________________________________

11.They don't have much time.They can't have lunch with us.(enough)

_________________________________________________

12.She practise speaking English everyday.She wants to speak it fluently.(in order to)

_______________________________________________________

13.It is reported that two people were seriously injured in the accident.

Two people_____________________________________

14.It is said that three men were arrested after the explosion.

Three man_________________________________________________

15.They are the best players in this game.

No player____________________________

16.They think that the old man died on the way to the hospital.

It_______________________________

The old man__________________________

17.What a pity you can't take part in our tour.

I wish________________________________

18.The air isn't pure,so were aren't healthy.

If______________________________--

19.We spoke to the man.He was very humorous.(who)

The man_________________________________________

20.His parents are both retired.They now live in Japan.

His parents____________________________

21.They asked me some different questions at the interview.

I___________________________-

0
45 lượt xem Bạn đã được cộng thêm +1 điểm online, tổng điểm: 32 REVIEW GRADE 8- UNIT 9-10-11 I. MULTIPLE CHOICE 1. We don’t know the name of the injured person. A. burned B. sterile C. wounded D. unconscious 2. Don’t let the victim become chilled. A. looked tired B. fall asleep C. appeared hungry D. get cold 3. They filled the bucket with water from the river. A. container B. glass C. pot D. bowl 4. The boy fell his bike and hit his head on the...
Đọc tiếp

45 lượt xem Bạn đã được cộng thêm +1 điểm online, tổng điểm: 32

REVIEW GRADE 8- UNIT 9-10-11
I. MULTIPLE CHOICE
1. We don’t know the name of the injured person.
A. burned B. sterile C. wounded D. unconscious
2. Don’t let the victim become chilled.
A. looked tired B. fall asleep C. appeared hungry D. get cold
3. They filled the bucket with water from the river.
A. container B. glass C. pot D. bowl
4. The boy fell his bike and hit his head on the road.
A. of B. for C. off D. out
5. Cool it immediately so as to minimize tissue damage
A. reduce B. deepen C. widen D. enlarge
6. People use first aid in order to the victim's pain and anxiety.
A. cure B. treat C. increase D. ease
7. We can stop the bleeding by using a towel to cover the wound, then put on it.
A. pressure B. medicine C. bandage D. cloth
6. Don't give the victim any food or drink if he or she gets .
A. happy B. sad C. shock D. fainting
7. Cover the burned area with a thick dressing.
A. polluted B. sterile C. dry D. affected
8. Farmers collect household and garden waste to make .
A. compost B. floor coverings C. pipes D. glassware
9. My sister sold all the empty cans she collected funds for the orphans.
A. to take B. to rise C. to raise D. to use
10. You will get back your when you bring the cans back for recycling.
A. deposit B. account C. envelop D. payment
11. means not buying products which are over packaged.
A. Reuse B. Recycle C. Reduce D. Refund
12. is a long thin piece of cloth or paper used for tying round and protecting a wound.
A. Water packs B. Bandage C. Blanket D. Handkerchief
13. She has already her cup five or six times.
A. refilled B. reduced C. reviewed D. recycled
14. The cup of coffee kept her all night.
A. awake B. alone C. asleep D. alive
15. I think we should use such as banana leaves, lotus leaves to wrap things.
A. tree products B. tree leaves C. fruit skins D. trees
16. Plastic bags are difficult to be destroyed, so the amount of garbage will .
A. go down B. reduce C. increase D. go away
17. We felt very happy Tet.
A. since B. in C. on D. at
18. The farmers look for other work get more money for their family.
A. in order to B. so as C. in order that D. so that
19. You should put the affected part under a running cold tap when you have .
A. a shock B. a faint C. a burn D. a pain

20. You should elevate the patient’s feet above the level of the heart.
A. raise B. rise C. press D. reduce
21. A is used for carrying somebody who is sick or injured and who can’t walk.
A. bandage B. armchair C. wheelchair D. crutch
22. Typhoons, floods or droughts can easily a harvest.
A. destroy B. finish C. provide D. defeat
23. My father has worked for that company over ten years.
A. for B. since C. at D. in
24. One of the solutions to reduce the shopping garbage is using .
A. plastic bags B. cloth bags C. wood bags D. liquid bags
25. can take a patient to the hospital quickly.
A. A crutch B. An ambulance C. A wheelchair D. A scale
26. He tried to explain what he did persuade his customers.
A. in order that B. in out of C. so as to D. so as not as
27. Contact an organization like Friend of the Earth information.
A. for B. to C. with D. about
28. He picked the phone as soon as it rang.
A. on B. up C. in D. off
29. How about going to Vincom Center for dinner, Alex?
A. That’s sound interesting. B. That sounds interesting.
C. Not at all. D. Please go ahead.
30. is a type of bed used for carrying the sick or injured people.
A. Stretcher B. Ambulance C. Crutch D. Bandage
31. My sister-in-law fainted but the nurse helped her soon.
A. ease B. revive C. minimize D. cool

1
16 tháng 3 2020

Sao toán lại có Tiếng Anh :))

5 tháng 4 2019

Đề bài

29 tháng 4 2019

12=3.2^2

30=3.2.5

66=11.2.3

BCNN(12,30,66)=3.2^2.11.5=660(sec)

660sec=11min

8:30min+11min=8:41min

=>The signal lights will flash together at 8:41

Form of the vebsHe promise he ( leace )..... before the sun ( rise )...The flights to London will (delay).....Because of heavy rainThis is the first time Hoa (meet) ....Tim's family.What ..... you ( do ) ....... this time yesterday ? I (work) ...... on the computerYesterday the light (go) ..... out while we ( have ) ......dinnerYesterday the doorbell ( ring )........ while Tom ( watch ) ....... TVDo you mind if I (aks)....... you a private question ?Would you like (go ) ...... to the movies ?...
Đọc tiếp

Form of the vebs

He promise he ( leace )..... before the sun ( rise )...

The flights to London will (delay).....Because of heavy rain

This is the first time Hoa (meet) ....Tim's family.

What ..... you ( do ) ....... this time yesterday ? I (work) ...... on the computer

Yesterday the light (go) ..... out while we ( have ) ......dinner

Yesterday the doorbell ( ring )........ while Tom ( watch ) ....... TV

Do you mind if I (aks)....... you a private question ?

Would you like (go ) ...... to the movies ? Sorry, I can't.

The new bridge will (build ) ...... by the end of the year

The garbage can ( use )..... to make fertilizer.

He said the pipes ( be ) .....broken .

They askes me ( repair )...... the table .

The old lamp ( make ) ....... in China is five dollars

54. I( already write ) the lesson ...............

That street ( not repair ) yet ..............

I ( not see ) her since I (come ) here ...............................

It is important ( think) carefully before ( make ) ........ a decision

How long you ( learn) .....English? For 4 years.

0
2 tháng 8 2016

1. Can Peter repair the bike ? ( skilful )
~> No , he ________________________isn't skilful enough to repair it.
2. Will you take a rest after lunch ? ( tired )
~> Yes , I _________________am tired enough to take a rest after lunch.
3. Can I work with these men ? ( old )
~> No , you _____________________aren't old enough to work with him
4 . Can she join our club ? ( old )
~> Yes, she ______________is old enough to join our club.
5. Can they hang the picture on the wall ? ( tall )
~> No, they ___________________ aren't tall enough to hang it on the wall.
6. Did you wear this coat last winter ? ( cold )
~> No , it was ________________ cold enough to wear this coat.
7. Can you listen to the music on the radio ? ( clear )
~> No, it ___________________ isn't clear enough to listen to the music on the radio
8. Will you buy the new CD of the band ? ( good )
~> Yes, the songs are __________________ good enough to by the new CD of the band.
9. Can we swim early in the morning these days ? ( warm ) 
~> Yes, the water is______________________ warm enogh to swim in the morning these days.
10. Why don't we sit ouside? ( cool )
~> Yes, it's __________________ cool enough to sit ouside.

2 tháng 8 2016

đây là học toán chứ ko phải tiếng anh