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4 tháng 3 2020

Mình học dốt Tiếng Anh nên không giải được bằng Tiếng Anh, mong bạn thông cảm :))

Số ngày tỉ lệ nghịch với số người

Số ngày tỉ lệ nghịch với số giờ mỗi người làm.

Vậy nếu có 15 người và mỗi người làm 8h/ ngày thì sẽ làm trong:

\(1:\frac{8}{6}:\frac{15}{5}=\frac{1}{4}\)(ngày)

đ/s

4 tháng 3 2020

Thank you và Donou arigatou gozamasu!!! :>

29 tháng 9 2017

+ Babies do it for up to 8 hours a day. Sleep. No one can live without it. But how much do we really need?
Scientists say that we all need 8 hours’s sleep every night .They find that, on average, adults sleep for 7 hours a night, with 32% sleeping less than 6 hours .They also say that the idea that we need less sleep as we get older is completely untrue. Professor Jim Horne of Southborough University studied a group of people who could spend as many hours as they wanted in bed ; after 10 hours they didn’t find it any easy to get up in the morning.
*Questions:
1.How many hours a day do babies sleep?

8 hours a day.
2.How many hours a day should we sleep?

8 hours.
3.How many hours a day do most people sleep?

7 hours a day.
4.What percentage of people sleep less than 6 hours a day?

32 %
5. Can people get up early in the morning after 10 hours’ sleep?

No, they can't.

30 tháng 10 2016

1 men repairs a car for : 6 x 4 = 24 (hours)

6 men repair a car for : 24 : 6 = 4 (hours)

30 tháng 10 2016

Mất 4 người đàn ông trong 6 giờ để sửa một chiếc xe. Hỏi mất bao nhiêu thời gian nếu 6 người đàn ông cùng sửa 1 chiếc xe mỗi người  kiểu như là bằng nhau đấy. TỰ giải nha, bài này dễn lắm

14 tháng 12 2018

1B 2C 3A 4A 5B

22 tháng 4 2020

C.Reading:
Last summer, Shara went to HCMC (1)…….. her parents. They flew there . It
( 2 )…….. ,them 18 hours. They stayed in a big hotel. It was clean and comfortable.
On the first day, they (3 ) ..….. Nha Rong Port and some other places of interest. On the second day ,they visited Cu Chi Tunnels (4 ) …….. they were amazed by hundreds of kilometers of underground defense works used during the war. Finally, they went to Vinh Nghiem Pagoda and they were really (5) …….. in the special atmosphere of peace and dignity there. After three days in HCMC ,they went to Hue to visit some citadels there. They really enjoyed their stay in Viet Nam.
*Read the passage and circle the best option A,B, C or D to complete it
1.A.with B.at C.to D.on
2.A.take B.took C.to take D.taken
3.A.to visit B.visit C.visited D.visiting
4.A.when B.what C.which D.where
5.A.interested B.interesting C.interests D.interest

*Circle the best option A,B, C or D to answer the questions:
1. How did Shara and her family go to HCMC?.......
A. coach B.bus C. train D. plane
2. How long did it take them to fly there ?.......
A. Half a day B. fifteen hours C. eighteen hours D. a day
3. Which did they stay in ?.......
A. hotel B. house C. restaurant D. motel
4. When did they go to Hue ?-After……. in HCMC.
A. some days B. Three days C. four days D. many days
5. How did they feel when they were in Viet Nam? They…..in Viet Nam.
A. liked it B. interesting in the journey C. hated the journey D. enjoyed their stay

22 tháng 4 2020

C.Reading:
Last summer, Shara went to HCMC (1)…….. her parents. They flew there . It
( 2 )…….. ,them 18 hours. They stayed in a big hotel. It was clean and comfortable.
On the first day, they (3 ) ..….. Nha Rong Port and some other places of interest. On the second day ,they visited Cu Chi Tunnels (4 ) …….. they were amazed by hundreds of kilometers of underground defense works used during the war. Finally, they went to Vinh Nghiem Pagoda and they were really (5) …….. in the special atmosphere of peace and dignity there. After three days in HCMC ,they went to Hue to visit some citadels there. They really enjoyed their stay in Viet Nam.
*Read the passage and circle the best option A,B, C or D to complete it
1.A.with B.at C.to D.on
2.A.take B.took C.to take D.taken
3.A.to visit B.visit C.visited D.visiting
4.A.when B.what C.which D.where
5.A.interested B.interesting C.interests D.interest

*Circle the best option A,B, C or D to answer the questions:
1. How did Shara and her family go to HCMC?.......
A. coach B.bus C. train D. plane
2. How long did it take them to fly there ?.......
A. Half a day B. fifteen hours C. eighteen hours D. a day
3. Which did they stay in ?.......
A. hotel B. house C. restaurant D. motel
4. When did they go to Hue ?-After……. in HCMC.
A. some days B. Three days C. four days D. many days
5. How did they feel when they were in Viet Nam? They…..in Viet Nam.
A. liked it B. interesting in the journey C. hated the journey D. enjoyed their stay

Giúp mình làm các câu hỏi này nha: (càng nhiều càng tốt!)1. Tiffany and Ryan deposit some amount in a joint bank account such that total balance remains 500. If  amount deposited by Tiffany and Ryan are plotted as a linear graph on xy plane, find the area between this graph and the coordinate axis.2.A group of workers is paving a road. If they pave 200m of the road a day, they will need 3 more days. to finish the work. If they pave 240m of the road a day, they will finish the work...
Đọc tiếp

Giúp mình làm các câu hỏi này nha: (càng nhiều càng tốt!)

1. Tiffany and Ryan deposit some amount in a joint bank account such that total balance remains 500. If  amount deposited by Tiffany and Ryan are plotted as a linear graph on xy plane, find the area between this graph and the coordinate axis.

2.A group of workers is paving a road. If they pave 200m of the road a day, they will need 3 more days. to finish the work. If they pave 240m of the road a day, they will finish the work 2 days in advance. How long is the road, in meter?

3. Mrs. Darlie has a silver ring, a golden ring and a diamond ring. She put them on her left hand. Each ring can be on any of the five fingers. When there are two or three rings on the same finger, if the order in which they are put is different, that couunt as a different way. How many different ways for Lea to put these rings?

4. Let P(x) be a polynomial with degree 3 such that P(1)=3, P(2)=3, P(3)=7, P(4)=21. Find the value of P(5).

1

4. Call that polynomial P (x) = ax3 + bx2 + cx + d

We have P(1)=a+b+c+d=3   (1)

P(2)=8a+4b+2c+d=3   (2)

P(3)=27a+9b+3c+d  =7       (3) 

P(4)=64a+16b+4c+d     =21    (4)

From (1) and  (2) =>  7a+3b+c=0

From (1) and  (4)  => 63a+15b+3c=18

=> 12b+6c=-18  => 2b+c=-3

From (1) and  (3) =>26a+8b+2c=4=> 13a+4b+c=2

=> 13a+2b=5

It is possible

Giúp mình làm các câu hỏi này nha: (càng nhiều càng tốt!)1. Tiffany and Ryan deposit some amount in a joint bank account such that total balance remains 500. If  amount deposited by Tiffany and Ryan are plotted as a linear graph on xy plane, find the area between this graph and the coordinate axis.2.A group of workers is paving a road. If they pave 200m of the road a day, they will need 3 more days. to finish the work. If they pave 240m of the road a day, they will finish the work...
Đọc tiếp

Giúp mình làm các câu hỏi này nha: (càng nhiều càng tốt!)

1. Tiffany and Ryan deposit some amount in a joint bank account such that total balance remains 500. If  amount deposited by Tiffany and Ryan are plotted as a linear graph on xy plane, find the area between this graph and the coordinate axis.

2.A group of workers is paving a road. If they pave 200m of the road a day, they will need 3 more days. to finish the work. If they pave 240m of the road a day, they will finish the work 2 days in advance. How long is the road, in meter?

3. Mrs. Darlie has a silver ring, a golden ring and a diamond ring. She put them on her left hand. Each ring can be on any of the five fingers. When there are two or three rings on the same finger, if the order in which they are put is different, that couunt as a different way. How many different ways for Lea to put these rings?

4. Let P(x) be a polynomial with degree 3 such that P(1)=3, P(2)=3, P(3)=7, P(4)=21. Find the value of P(5).

2
1. Tiffany và Ryan gửi một số tiền vào tài khoản ngân hàng chung sao cho tổng số dư còn lại 500. Nếu số tiền được gửi bởi Tiffany và Ryan được vẽ dưới dạng biểu đồ tuyến tính trên mặt phẳng xy, hãy tìm khu vực giữa biểu đồ này và trục tọa độ. 2.Một nhóm công nhân đang mở đường. Nếu họ mở 200m đường mỗi ngày, họ sẽ cần thêm 3 ngày nữa. để hoàn thành công việc. Nếu họ mở 240m đường mỗi ngày, họ sẽ hoàn thành công việc trước 2 ngày. Bao lâu là đường, tính bằng mét? 3. Bà Darlie có một chiếc nhẫn bạc, một chiếc nhẫn vàng và một chiếc nhẫn kim cương. Cô đặt chúng lên tay trái. Mỗi chiếc nhẫn có thể nằm trên bất kỳ ngón tay nào trong năm ngón tay. Khi có hai hoặc ba chiếc nhẫn trên cùng một ngón tay, nếu thứ tự chúng được đặt khác nhau, thì đó là một cách khác nhau. Có bao nhiêu cách khác nhau để Lea đặt những chiếc nhẫn này? 4. Đặt P (x) là một đa thức có bậc 3 sao cho P (1) = 3, P (2) = 3, P (3) = 7, P (4) = 21. Tìm giá trị của P (5).
21 tháng 6 2019

#)Góp ý :

Mấy câu như thế này thì bạn nên lên Discuss with Math You - MathYou hỏi nhé ^^

Vì web này chuyên cho học sinh giải toán tiếng anh nên lên đây hỏi sẽ tiện hơn

35.B

36.C

37.A

38.B

39.B

         35 . B

         36 . C

         37 . A

         38 . B

         39 . B

A robot can not think or do things alone . People use a computer to control it .Today , robots are not very popular because they are too expensive ,but they are very useful .They can help us save a lot of time and work . A robot can do the same work for 24 hours , and yet , it does not complain or get tired . In the US , people use robots to guard some important places . There robots can listen to certain noises and send signals for help if there's trouble or danger.In Japan , people use robots...
Đọc tiếp

A robot can not think or do things alone . People use a computer to control it .Today , robots are not very popular because they are too expensive ,but they are very useful .They can help us save a lot of time and work . A robot can do the same work for 24 hours , and yet , it does not complain or get tired . In the US , people use robots to guard some important places . There robots can listen to certain noises and send signals for help if there's trouble or danger.In Japan , people use robots in factories to build cars .In the future , scientists will design many types of intelligent robots . Thier robots will be able to do many more complicated things .However , some people do not like robots . They fear that one day robots will be too powerful 

1 . how long can a robot do ?

2. the words " it " in the passage refers to..........................

3. what do japanese people use robots in factories for?

4. some poeple fear that one day robots......................................

trả lời nhanh giúp mk nhé thanks 

10 bạn sớm nhất mk sẽ tick cho !!!

 

3
5 tháng 7 2016

1. a robot can do the same work for 24 hours

2. the words it in the passage refers to robot

3. japanese people use robot in factories for build cars

4. some people fear that one day robots will be too powerful

5 tháng 7 2016

1. Beacause it can't think or do things alone.Blog.Uhm.vN

2. No, they aren't.Blog.Uhm.vN

3. People in the US use robot to guard some important places.Blog.Uhm.vN

4. People use robots in factories to build cars.Blog.Uhm.vN

Blog.Uhm.vN