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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 $32$

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)

12 tháng 4 2017

Gọi S là quãng đường
v là vận tốc

t là thời gian Mr.J đi thường ngày

=>\(\dfrac{S}{120\%v}=t-1\)

\(\dfrac{100}{v}+\dfrac{S-100}{130\%v}=t-1\)

=>\(\dfrac{S}{120\%v}=\dfrac{100}{v}+\dfrac{S-100}{130\%v}\)

<=>\(\dfrac{130S}{156v}=\dfrac{15600+120S-12000}{156v}\)

<=>\(10S=3600\)

<=>\(S=360\)

Xong rầu đó khỏi cảm ơn leuleu

11 tháng 4 2017

Đáp án: AB = 360 km

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
Lesson 1: analyzing the polynomial factors.Notes + 2 x-1x 3 + 6x2 + 11x + 6x 4 + 2 x 2-3AB + ac + b2 + 2bc + c2A3-b3 + c3 + 3abcLesson 2: for functions: search conditions of x to A means.A shortening.Computer x to A < 1.Post 3: prove the inequality:For a + b + c = 0. Prove that: a3 + b3 + c3 = 3abc.For a, b, c are the sidelengths of the triangle. Proof that:Prove that x 5 + y5 ≥ x4y + xy4 with x, y ≠ 0 and x + y ≥ 0Lesson 4: solve the equation:x 2-3 x + 2 + | x-1 | = 0Lesson 5: find the...
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Lesson 1: analyzing the polynomial factors.

Notes + 2 x-1
x 3 + 6x2 + 11x + 6
x 4 + 2 x 2-3
AB + ac + b2 + 2bc + c2
A3-b3 + c3 + 3abc
Lesson 2: for functions: 

search conditions of x to A means.
A shortening.
Computer x to A < 1.
Post 3: prove the inequality:

For a + b + c = 0. Prove that: a3 + b3 + c3 = 3abc.
For a, b, c are the sidelengths of the triangle. Proof that:


Prove that x 5 + y5 ≥ x4y + xy4 with x, y ≠ 0 and x + y ≥ 0
Lesson 4: solve the equation:

x 2-3 x + 2 + | x-1 | = 0


Lesson 5: find the largest and smallest value (if any)

A = x 2-2 x + 5
B =-2 x 2-4 x + 1.
C = 
Lesson 6: calculate the value of expression.

Know a – b = 7 feature: A = (a + 1) a2-b2 (b-1) + ab-3ab (a-b + 1)
For three numbers a, b, c is not zero catches up deals for equality: 
Computer: P = 

Article 7: proof that

8351634 + 8241142 divisible 26.
A = n3 + 6n2-19n-24 divisible by 6.
B = (10n-9n-1) divisible 27 with n in N *.
Article 8:

In the motorcycle race three cars depart at once. The second car in a one-hour run slower than the first car 15 km and 3 km third cars. rapidly should the destination more slowly the first car 12 minutes and the third car earlier today. No stops along the way. Calculate the speed of each car, race distance and the time each car

0
1: This time next month i (sit)....on a beach2: I(wait) .....for you when you come out3: You (wait)....for her when her plane arrives tonight?4: next week at this time, you(lie) on the beach5:You(meet) ..... your form teachers at 9a.m tomorrow morning, won't you?6: Do more exercise and you(feel)...healthier7: I (not study)....this evening.Do you want to go out?8: My brother and I(not camp)...this week.We will be too busy studying for exams.9: My friend(practice)....for the TOEFL exam over her...
Đọc tiếp

1: This time next month i (sit)....on a beach

2: I(wait) .....for you when you come out

3: You (wait)....for her when her plane arrives tonight?

4: next week at this time, you(lie) on the beach

5:You(meet) ..... your form teachers at 9a.m tomorrow morning, won't you?

6: Do more exercise and you(feel)...healthier

7: I (not study)....this evening.Do you want to go out?

8: My brother and I(not camp)...this week.We will be too busy studying for exams.

9: My friend(practice)....for the TOEFL exam over her summer vacation

10: At this time tomorrow,what.....you...(do)?

11: Next week I(drive)....from HN to HCM city.You won't able to contact me for a couple of days

12: Tomorrow, I....(sit) in the same seat that I am sitting now.

13: I..........(not travel) with my brother through Eorope because I don't have enough money

14: My brother......(not get) married any time soon. He has no job and he doesn't seem to want to do anything

19: We......(ride) our bicycles around Hoan Kiem Lake from 6a.m to 8a.m tomorrow

20: Don't worry.If we (not understand).......the lesson, the teacher (explain)....... it again

6
22 tháng 8 2017

Đây là để hỏi đáp toán tự nhiên lại hỏi Anh Văn.

22 tháng 8 2017

đây là nơi học toán chứ ko phải học tiếng anh

27 tháng 10 2015

Mái trường cho dù họ đã phai mờ nhưng vẫn không chắc chắn, bao gồm hai dãy phòng và ba phòng cho khu vực hành chính. Trong lớp học của tôi rất sạch sẽ và ngăn nắp vì chúng tôi rất ý thức về vệ sinh và sạch sẽ.

Học sinh của trường đang học có nhiều cây xanh bóng mát và băng ghế trong sân trường, tôi yêu trường tôi và tôi đến trường mỗi ngày.

Các giáo viên nói với chúng tôi luôn tuân thủ các quy định của trường, và chúng tôi không viết vẽ bậy trên bàn làm việc để giữ cho bạn môi trường sạch sẽ và đẹp.

Tôi thực sự muốn đi học vì mỗi gặp nhiều bạn bè, để gặp gỡ giáo viên. Ngôi trường này là nơi thắp sáng ước mơ cho tôi, sau đó tôi sẽ ước mơ trở thành cô giáo dạy tại trường này.

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