K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

Gọi giá tiền của 1 cái bàn là x(đô la), giá tiền của 1 cái ghế là y(đô la)

1 cái bàn và 3 cái ghế giống nhau có giá 765 đô la nên x+3y=765(1)

2 cái bàn và 4 cái ghế như vậy có giá 1370 đô la nên 

2x+4y=1370

=>x+2y=685(2)

Từ (1),(2) ta có hệ phương trình:

\(\left\{{}\begin{matrix}x+3y=765\\x+2y=685\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}x+3y-x-2y=765-685\\x+2y=685\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}y=80\\x=685-2y=685-160=525\end{matrix}\right.\left(nhận\right)\)

=>Giá tiền của 8 cái ghế là 8*80=640 đô la

2 tháng 2 2017

419 nhe tai to cung chua chac dau nhe 

Bài thi số 2Điền kết quả thích hợp vào chỗ (...): 19:34Fill in the blank with the suitable numberCâu 1:There were 5256 people in a commune. After a year, the population increased by 79. One year later, it increased further by 71. How many people are there in total after 2 years?Answer:  people.Câu 2:Find the value of y such that y - 305 = 545.Answer: y = Câu 3:The sides of a triangle are a, b and c respectively.What is the perimeter of the triangle if a = 8cm, b = 6cm, c...
Đọc tiếp

Bài thi số 2

Điền kết quả thích hợp vào chỗ (...):

 19:34

Fill in the blank with the suitable number

Câu 1:
There were 5256 people in a commune. After a year, the population increased by 79. One year later, it increased further by 71. How many people are there in total after 2 years?
Answer:  people.

Câu 2:
Find the value of y such that y - 305 = 545.
Answer: y = 

Câu 3:
The sides of a triangle are a, b and c respectively.

What is the perimeter of the triangle if a = 8cm, b = 6cm, c = 6cm?
Answer: The perimeter of the triangle is  cm.

Câu 4:
A fund received 75500000 VND on the first day, 85950000 VND on the second day and 14500000 VND on the third day. How much money did the fund receive altogether?
Answer: The fund received  VND altogether.

Câu 5:
The sum of the ages of the father and his son is 58. The father is 38 years older than his son. How old is the father?
Answer: The father is  years old.

Câu 6:
The perimeter of a rectangle is 32cm. The length is 4cm longer than the width. What is its area?
Answer: Its area is  .

Câu 7:
The sum of the ages of the mother and her son is 60. The mother is 38 years older than her son. How old is the mother?
Answer: The mother is  years old.

Câu 8:
In a café, there were 267 adults and 123 teenagers. If each of them spent 8 dollars then they spent  dollars in all.

Câu 9:
If A - B = 8 and the average of A and B is 7 then A = 

Câu 10:
On a Christmas tree, there are 45 glass stars and 26 golden balls. Each glass star costs 4 dollars while a golden ball costs 3 more dollars than a glass star. What is the total cost of the glass stars and golden balls?
Answer: The total cost is  dollars.

đây là đề thi toán tiếng anh lớp 4 vòng 6 đó!

 

 

4
21 tháng 12 2016

Câu 1 : 5406

Câu 2 : 850

Câu 3 : 20

Câu 4 : 107950000

Câu 5 : 48

Câu 6 : 60

Câu 7 : 49

Câu 8 : 3120

Câu 9 : 11

Câu 10 : 362

8 tháng 3 2017

câu 4 107950000

PhotoBui Vu Tra MyTrường Tiểu Học Kim ĐồngLớp 4a2ID: 50462017LỚP BẠN ĐANG DỰ THILớp 4VÒNG THI HIỆN TẠI VIOLYMPICVòng 6VÒNG THI CỦA BẠNVòng 6LẦN THI1Bài thi số 2Điền kết quả thích hợp vào chỗ (...): 19:34Fill in the blank with the suitable numberCâu 1:There were 5256 people in a commune. After a year, the population increased by 79. One year later, it increased further by 71. How many people are there in total after 2...
Đọc tiếp

Photo

Bui Vu Tra My

Trường Tiểu Học Kim Đồng

Lớp 4a2

ID: 50462017

LỚP BẠN ĐANG DỰ THI

Lớp 4

VÒNG THI HIỆN TẠI VIOLYMPIC

Vòng 6

VÒNG THI CỦA BẠN

Vòng 6

LẦN THI

1

Bài thi số 2

Điền kết quả thích hợp vào chỗ (...):

 19:34

Fill in the blank with the suitable number

Câu 1:
There were 5256 people in a commune. After a year, the population increased by 79. One year later, it increased further by 71. How many people are there in total after 2 years?
Answer:  people.

Câu 2:
Find the value of y such that y - 305 = 545.
Answer: y = 

Câu 3:
The sides of a triangle are a, b and c respectively.

What is the perimeter of the triangle if a = 8cm, b = 6cm, c = 6cm?
Answer: The perimeter of the triangle is  cm.

Câu 4:
A fund received 75500000 VND on the first day, 85950000 VND on the second day and 14500000 VND on the third day. How much money did the fund receive altogether?
Answer: The fund received  VND altogether.

Câu 5:
The sum of the ages of the father and his son is 58. The father is 38 years older than his son. How old is the father?
Answer: The father is  years old.

Câu 6:
The perimeter of a rectangle is 32cm. The length is 4cm longer than the width. What is its area?
Answer: Its area is  .

Câu 7:
The sum of the ages of the mother and her son is 60. The mother is 38 years older than her son. How old is the mother?
Answer: The mother is  years old.

Câu 8:
In a café, there were 267 adults and 123 teenagers. If each of them spent 8 dollars then they spent  dollars in all.

Câu 9:
If A - B = 8 and the average of A and B is 7 then A = 

Câu 10:
On a Christmas tree, there are 45 glass stars and 26 golden balls. Each glass star costs 4 dollars while a golden ball costs 3 more dollars than a glass star. What is the total cost of the glass stars and golden balls?
Answer: The total cost is  dollars.

đây là đề thi toán tiếng anh lớp 4 vòng 6 đó!

4
21 tháng 12 2016

sao dài thế?

20 tháng 12 2016

Cách giải câu 7 nè !

Tuổi của mẹ là :

  ( 60 + 38 ) : 2 = 49 ( tuổi )

     Đáp số : 49 tuổi 

Bạn k mk nhé ! Mk sẽ giải hết cho bạn !

Exam number 1                                                                                                  Fill in the blank with the correct numberQuestion 1:Divide 2016×2016 by 2016. The quotient is .....Question 2:Subtract 346 from 752.Answer: ....Question 3:Study the pattern.88:8=11  880:8=110 8800:8= ? The missing number is .....Question 4:Express seventy thousand, four hundred and nine in numerals.Answer: .....Question 5:The product...
Đọc tiếp

Exam number 1                                                                                                  

Fill in the blank with the correct number

Question 1:
Divide 2016×2016 by 2016. The quotient is .....

Question 2:
Subtract 346 from 752.
Answer: ....

Question 3:
Study the pattern.
88:8=11  
880:8=110 
8800:8= ? 
The missing number is .....

Question 4:
Express seventy thousand, four hundred and nine in numerals.
Answer: .....

Question 5:
The product of 2 different natural numbers is 9. Their sum is .....

Question 6:
100 hundreds + 1000 tens = ...... ones

Question 7:
The ratio of boys to girls at a school is 5:4. If there are 255 boys at the school then how many students are there at the school? 
Answer:  ...... students.

Question 8:
If two dozen pencils cost 12 dollars then .... pencils cost 2 dollars.

Question 9:
Peter and John played in fifteen rounds game. In each round, the winner scored 5 points and the loser scored 2 points. At the end of the game, John’s total score was 57 points. How many rounds did Peter win?
Answer: ..... rounds.

Question 10:
If we write all of the whole numbers from 10 through 99 and cross out any number in which the first or second digit is divisible by 2 (for example, 41 is crossed out as 4 is divisible by 2 and 36 is crossed out as 6 is divisible by 2), how many numbers are crossed out?

Answer: ....  numbers.

0
10 tháng 9 2023

một trang trại có tất cả 40 con gà và con thỏ. Anh ấy đếm có tất cả 120 cái chân. Hỏi có bao nhiêu con gà và thỏ ở trang trại đó?

Đáp án: một con gà có 2 chân,một con thỏ có 4 chân tổng cộng 6 chân, 120 : 6 = 20 con gà và thỏ

10 tháng 9 2023

tick cho mình nhé

24 tháng 3 2020

The largest number of ball the team can buy is: 

              140 : 8 = 17 (Remander: 4)