a: Tổng vận tốc hai xe là 12+5=17(km/h)

Hai xe gặp nhau sau khi đi được: 14/17(giờ)

Hai xe gặp nhau lúc:

8h+14/17h\(\simeq\)8h49p

b: Chỗ hai người gặp nhau cách B:

\(\dfrac{14}{17}\cdot5=\dfrac{70}{17}\left(km\right)\)

a, Thời gian 2 người gặp nhau là:

\(14:\left(12-5\right)=2\) (giờ)

Đến số giờ thì người đi xe đạp đuổi kịp người đi bộ là:

\(8+2=10\) (giờ)

b, Chỗ người đi xe đạp đuổi kịp người đi bộ cách B là:

\(5\cdot2=10\left(km\right)\)

Đáp số: \(a,10\) giờ, \(b,10km\)

\(a,146+121+54+379\\ =\left(146+54\right)+\left(121+379\right)\\ =200+500\\ =700\)

\(b,12\cdot53+53\cdot172-53\cdot84\\ =53\cdot\left(12+172-84\right)\\ =53\cdot100\\ =5300\)

\(c,22344\cdot36+44688\cdot82\\ =44688\cdot18+44688\cdot82\\ =44688\cdot\left(18+82\right)\\ =44688\cdot100\\ =4468800\)

Thể tích phần bể chứa nước ban đầu là:

\(80\cdot50\cdot35=140000\left(cm^3\right)\)

Thể tích phần bể chứa nước lúc này sau khi thêm hòn đá là:

\(140000+20000=160000\left(cm^3\right)\)

Mực nước trong bể lúc này cao là:

\(160000:80:50=40\left(cm\right)\)

Thể tích ban đầu: 80 x 50 x 35 = 140.000 cm3

Sau khi thêm hòn đá: 140.000+20.000 =  160.000 cm3

=> Chiều cao mực nước = 160.000 / (80x50) = 40 cm

Chu vi 1 khung thép: (95+64) x 2 = 318cm

=> số khung thép làm được: 9540 : 318 = 30 cái

chu vi của khung thép là:

(95+64)*2=318(cm)

làm được số khung thép là:

954 : 318 = 3(khung thép)

                 đ/s:...

8 PHẦN 10

$\drafc {8}{10}$

Ta biết: \(1kg=0,001\) tấn

\(\rightarrow85kg=0,085\) tấn

\(\Rightarrow D.0,085\) 

Ta có:

tấn     tạ     yến    kg      hg     dag    g

mỗi đơn vị cách nhau 10

ta thấy 1kg=0,01 tấn

Nên 85kg=0,085 tấn

vậy D là đáp án đúng

hok tốt!!

\(a,A=\left\{10;11;12;...;69;70\right\}\)

Số phần tử trong tập hợp A là:

\(\left(70-10\right):1+1=61\) (phần tử)

\(b,B=\left\{0;2;4;...;48;50\right\}\)

Số phần tử trong tập hợp B là:

\(\left(50-0\right):2+1=26\) (phần tử)

\(c,C=\left\{1;4;7;...;97;100\right\}\)

Số phần tử trong tập hợp C là:

\(\left(100-1\right):3+1=34\) (phần tử)

Mark the letter A, B, C, or D to indicate the word whose underlined part is pronounced differently from that of the rest in each of the following questions.

1.         A. arrive                      B. quickly                   C. historic                   D. city

2.         A. post                        B. cost                         C. question                  D. coast

Mark the letter A, B, C, or D to indicate the word which does not belong to each group.

3.         A. market                    B. cathedral                C. park                        D. suburb

4.         A. boring                     B. exciting                  C. convenient              D. interesting

Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

5. The weather is nice, so I enjoy doing __________ activities.

A. outdoor                    B. inside                     C. outdoors                 D. boring

6. The streets in the old quarter in Ha Noi are not wide. They are __________.

A. exciting                  B. quiet                       C. narrow                    D. noisy

7. The map says that art gallery is ____________ than the cathedral. 

A. near                        B. far from                  C. nearer                    D. next to

8. Can you __________ us the __________ to the post office?

A. show – road           B. show –street         C. tell – road                  D. tell - way                       

9. City life  is ________ than country life.

A. expensive               B. more expensive    C. expensiver                D. expensive more

10. The cat is sleeping ________________of the chair.

A. on                           B. behind                    C. in front                   D. opposite           

11. The students_______________ their new uniforms now.

A. wear                       B. wears                      C. wearing                  D. are wearing

12. You _______ ask other people for lucky money. It _______ very polite.

     A. shouldn’t - is                B. should – is               C. shouldn’t - isn’t      D. should - isn’t

13. People often spend time visiting their _______ during Tet.

     A. neighbours                    B. teachers                   C. relatives                  D. friends

14. There is _______ sand on the beach, so we can build _______ sandcastles.

      A. many - much                B. a few - many          C. much - many          D. a little - much

Mark the letter A, B, C, or D to indicate the most suitable response to complete each of the following exchanges.

15.       How about visiting Tan Ky House? - ___________________________

            A. Yes, I’d love to      B. Yes, that’s a good idea       C. No, I don’t              D. Yes, thank you

16.       Nick: What are you doing this afternoon? Nam: ____________, but I’d like to go swimming.

A. Let’s go                  B. I don’t know                       C. Here you are           D. Goodbye. See you soon.

Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.

17. This river is more polluted as other rivers in the area.

              A. is                           B. as                                        C. polluted                  D. in

18. Not turn left at the traffic lights but turn right at the next corner.

             A. at                          B. Not                                     C. at                            D. turn

19. How many room are there in the new house?

            A.  room                      B. are there                             C. in                            D. new

20. I’m very thirsty. I’d like any apple juice.

            A. I’m                         B. thirsty                                 C. like                         D. any

  Choose the word or phrase (A, B, C or D) that indicate the word/phrase which is CLOSEST in meaning to the underlined part.

21. Ho Chi Minh city is more spacious than Da Nang.

            A. large                       B. small                      C. smaller                D. larger

22. A lot of people visit Mui Ne in the summer.       

A. An                          B. any                          C. Much                      D. Many

Choose the word or phrase (A, B, C or D) that indicate the word/phrase which is OPPOSITE in meaning to the underlined part.

23. The path is too narrow for two people to walk together.

A. wide                       B. modern                   C. small                       D. old

24. Children often receive lucky money from the adults on New Year’s Days.

             A. send                      B. buy                          C. sell                          D. save

 Read the following letter and mark the letter A, B, c, or D to indicate the correct word or phrase that best fits each of the numbered blanks.

Dear Ha,

Let’s (25) ______on Sunday evening at Quynh Café on Tran Quang Dieu Street. There’s a post office on the corner of the street. The café is next to the post office. There’s a (26) _______ opposite the café so we can see a film after we have coffee.

To get to the café, take bus (27) _______8 to Truong Thi Street. Get off at the bus stop in front of a park. Go (28) _______the street until you get to the traffic lights and then turn right. Take the first turning on your right. (29) _______ straight ahead – just about 500 metres and it’s on your left.

See you there!

Khang

25.       A. meets                      B. meet                       C. met                         D. meeting

26.       A. pagoda                    B. school                     C. bank                        D. cinema

27.       A. call                         B. name                       C. number                   D. branch

28.       A. along                      B. right                        C. left                          D. up

29.       A. Play                        B. Work                       C. Stand                      D. Go

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

      Hello. My name is John. I live in an apartment in New York, the USA. It is a big city. It has got a lot of high buildings, supermarkets, banks and shops. There is much traffic and there are often traffic jams at rush hours. It is very noisy here, but I enjoy living here because everything is exciting and attractive to me.

     Hi, I am Kate. I am John’s elder cousin. I live in a village in the suburbs of Canberra, Australia. It is quieter than New York. It hasn’t got many shops, supermarkets and restaurants. There are some farms around my house. You can see a lot of sheep and kangaroos on the farms. There are not many people here, but they are friendly. I prefer to live in the countryside because I enjoy the fresh air and peaceful life here.

30. New York has got a lot of high buildings, supermarkets, banks and _______________.

A. shops                      B. post offices C. parks                         D. café

31. It is very _________________ in New York City.

A. peaceful                 B. noisy                       C. quiet                          D. dirty

32. Kate is __________________ than John.

A. taller                       B. younger                  C. older                         D. shorter

33. Kate lives in a _________________ in an area away from Canberra, Australia.

A. village                    B. town                       C. city                            D. street

 34. Kate prefers to live in the countryside because she likes _______ and peaceful life there.

A. exciting life            B. fresh air                  C. beautiful parks       D. supermarkets

  Mark letter A, B, C or D to indicate the sentence that is closest in meaning to the original sentence in each of the following questions.

35. The car / front / the bus.

A. The bus is next the car.                                          B. The car is front of the bus.

C. The car is behind the bus.                                      D. The car is in front of the bus.

36. Quan is lazier than Huy.

A. Huy is as harder than Quan.                                  B. Huy is as hard as Quan.

C. Huy is harder than Quan.                                       D. Huy isn’t harder than Quan.

37.  Ho Chi Minh City /modern / Hoi An.

A. Hoi An is not as modern in Ho Chi Minh City.

B. Hoi An is more modern as Ho Chi Minh City.

C. Ho Chi Minh City is moderner than Hoi An.

D. Ho Chi Minh City is more modern than Hoi An.

38. Kiet is the best at English in his class.

A. Nobody in Kiet’s class is better at English than Kiet.

B. Nobody in Kiet’s class is good at English than Kiet.

C. Nobody in Kiet’s class is not better at English than Kiet.

D. Nobody in Kiet’s class is not good at English than Kiet.

39. It is wrong of us to throw rubbish.

A. We must throw rubbish.                             B. We mustn’t not throw rubbish.

C. We mustn’t throw rubbish.                        D. We mustn’t throwing rubbish.

40. It is not good to stay up so late to listen to music.

A. You should stay up so late to listen to music.

B. You should not stay up so late to listen to music.

C. You should not stays up so late to listen to music.

D. You should stay not up so late to listen to music.

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