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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 =...
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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 years?Answer:  people.Câu...
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 !

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

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 of 2 different natural numbers is 9. Their sum is...
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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
24 tháng 3 2020

The largest number of ball the team can buy is: 

              140 : 8 = 17 (Remander: 4)