Gọi mỗi phần lần lượt là x , y và z.

Theo đề, ta có:

\(\dfrac{x}{\dfrac{1}{5}}=\dfrac{y}{\dfrac{16}{5}}=\dfrac{z}{\dfrac{4}{5}}\) và \(x+y+z=786\)

Áp dụng tính chất dãy tỉ số bằng nhau, ta có:

\(\dfrac{x}{\dfrac{1}{5}}=\dfrac{y}{\dfrac{16}{5}}=\dfrac{z}{\dfrac{4}{5}}=\dfrac{x+y+z}{\dfrac{1}{5}+\dfrac{16}{5}+\dfrac{4}{5}}=\dfrac{786}{\dfrac{21}{5}}=\dfrac{1315}{7}\)

\(\dfrac{x}{\dfrac{1}{5}}=\dfrac{1315}{7}\Rightarrow x=\dfrac{1315}{7}.\dfrac{1}{5}=\dfrac{263}{7}\)

\(\dfrac{y}{\dfrac{16}{5}}=\dfrac{1315}{7}\Rightarrow y=\dfrac{1315}{7}.\dfrac{16}{5}=\dfrac{4208}{7}\)

\(\dfrac{z}{\dfrac{4}{5}}=\dfrac{1315}{7}\Rightarrow z=\dfrac{1315}{7}.\dfrac{4}{5}=\dfrac{1052}{7}\)

Vậy ...

Rewrite each sentence in such a way that it means almost the same as printed before it. Use the word in brackets.

1. They say he is able to swim across the river. (swimming)

-> He is said to be capable of swimming across the river.

2. They may be there at the meeting, or they may not. (out)

-> It is uncertain whether they will turn out at the meeting or not.

3. "Don't forget to hand in the paper by the deadline." Said the teacher (reminder)

-> The teacher gave us a reminder that we had to hand in the paper by the deadline.

4. Learning English is becoming more and more popular in our city. (increasingly)

-> It has become increasingly popular in our city to learn English.

5. Right after disembarkation from the plane,he was taken into custody. (got)

-> As soon as he got off from the plane, he was taken into custody.

6. The teacher and his students knew nothing about the crack on the wall. (idea)

-> Neither the teacher nor his students had any idea about the crack on the wall.

7. The boy's effort really impressed the audience ang judges (left)

-> It was the boy's effort that left a good impression on the audience and judges.

8. Instead, you must try to have a good relationship with the others. (get)

-> I wish you would try to get on well with the others.

9. I always go jogging in the morning to keep fit. (invariably)

-> In order to keep fit, I invariably go jogging in the morning.

10. Doubtlessly,Katie is the best violinist in the conservatory. (no-one)

-> It goes without saying that no-one else in the conservatory plays the violin as well as Katie.

1. hoàn chỉnh câu

a. what/ you/ do/ last weekend

=> What did you do last weekend?

b. My grandfather/ used/ tell/ stories/ until/we/fall/asleep

=> My grandfather used to tell stories untile we felt asleep.

2. Sắp xếp câu

a. Was/ a/ girl/ little/ when/ I/ ,/ used to/ I/ my father’s advice/ listen to

=> When I was a little girl, I used to listen to my father's advice.

3. Chọn từ sai và sửa lại

a. One day, two americans decided spending => to spend their time traveling in spain

b. They wanted him understand => to understand that they wanted some milk and sandwiches

ai ủng hộ vài li-ke lên điểm hỏi đáp đê

1 . make sentences using the words and phrases given

a, she/study/math/english/thursday afternoon

=> She studies Math and English on Thursday afternoon.

b,he/excited/his/first day/ school

=> He is excited about his first day at school.

c,she/ wear / new uniform / moment

=> She is wearing a new uniform at the moment.

d cat/ in front if / computer

=> The cat is in front of the computer.

e there / bed/ wardrobe/in/bedroom

=> There is a bed and a wardrobe in my bedroom.

40% của 70 là: 70 : 100 x 40 = 28.

Change the sentences from the present simple activeinto the present simple passvie :

1. Jonnathan is painting his new hours.

=> Jonnathan's new hours is being painted by him.

2. The Frech director filmed the last scenes of the flim.

=> The last scenes of the flim were filmed by the Frech director.

3. Christine singed the contract in the afternoon.

=> The contract was signed by Christine in the afternoon.

4. Amy often downloads some good music on the computer.

=> Some good musics are often downloaded by Amy on the computer.

5. The Chinese are holding an important meeting.

=> An important meeting is being held by the Chinese.

6. The women team won the match.

=> The match was won by the women team.

7. Mathew is parking his car in front of the cinema.

=> Mathew's car is being parked in front of the cinema by him.

8. The carpenter is making me some furniture.

=> Some furniture is being made for me by the carpenter.

Giúp mình câu này với

put the correct verb

1 They had sold all the books when we (get) .......got........there

2 John (watch) ...was watching......TV at 8 last evening

3 He (do)......had done......his homework before he went to the cinema

4 Yester day the police (report).......reported.........that they (capture)............had captured...........the thife

5 My friend (thank)........thanked.........me for what i had done for him

6 They (go) ........went........ home after they (finish).......had finished.........their work

7 she (win).......won........the gold medal in 1986

8 What were you (do) ......doing.... at 6 p.m Yesterday ?

Giúp mình câu này với

1 Tìm một lỗi sai và sửa lại

1 Before he went to bed, he did => had done his homework

2 when i found my wallet , someone took => had taken the money out of it

3 while drove => driving my car , i sawm an accident .

4 when we came to the cinema , the film was shown => had been shown for 15 minutes

5 After tom washed => had washed his clothes, he began to study

6 The policeman made => told us not to driver => drive to fast

7 By the time i got back , Ha went => had gone come

9 There are some exercises being done => to be done tonight

Use the correct form of the verbs in brackets.
1. …………Don't cut………(not cut) the carrots until you have washed them.
2. ……Have……..you………visited……..(visit) the Imperial Academy in Ha Noi yet?
3. Yesterday, Tom………drew…………(draw) a picture which is much more beautiful than his previous one.
4. Sue……………received………….(receive) three postcards from her cousin.
5. Tom…………picked…………(pick) up by his friend last night.
6. I……have……..never………been………(be) to the Temple of Literature before?
7. Just a minute! I………will help…………(help) you fold the omelette in half.
8. They……………didn't serve…………(not serve) chef’s special dishes last night.
9. My mum…………is cutting…………(cut) beef for the noodles soup at the moment.
10. Peter…………hasn't taken…………(not take) the cake out of the electric oven yet.
11. She………is making………….(make) a plan for her vacation at present.
12. Mike…………played…………..(play) the piano beautifully last night.
13. I practise Art by…………drawing…………(draw) many paintings.
14. He……………has written………..(write) two songs since last summer.
15. I think she…………will act…………(act) the part of Princess in the next play.