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18 tháng 7 2016

minh ko biet nhung minh biet de

Một cuộc khảo sát được tiến hành trên 100 học sinh đầu năm. Những phát hiện này như sau:

56 học sinh thích Toán học

38 sinh viên thích tiếng Anh

52 sinh viên thích Khoa học

6 học sinh thích cả hai môn Toán và tiếng Anh

4 sinh viên thích cả tiếng Anh và Khoa học

12 học sinh thích cả ba đối tượng

(A) bao nhiêu học sinh thích cả hai môn Toán và khoa học?

(B) Có bao nhiêu sinh viên thích chỉ Toán học

23 tháng 11 2017

Tôi tịt

BCNN(2;4;7)=28

=>Có 28 bạn

Số bạn chơi hockey là: 28*1/4=7 bạn

28 tháng 3 2023

7

 

 

 

 

 

4 tháng 6 2016

Gọi x là số học sinh có cả anh chị  trong lớp John .Ta có sơ đồ Ven : 18-x hs chỉ có anh 16 -x hs chỉ có chị x hs 4 hs không có anh chị 35 học sinh

=> (18 - x) + x + (16 - x) + 4 = 35 <=> 38 - x = 35 => x = 38 - 35 = 3

Vậy lớp John có 3 học sinh có cả anh và chị

27 tháng 8 2017

Sorry i can not answer your question !

28 tháng 8 2017

why?Is it so hard?

Read the text, and answer the questions                        The Royal Ballet School, LondonThere are only 25 places for the new students every school year. Students are from 11 to 16 years old, and there are boys and girls. It''s a bording school.On weekdays, there are four hours of lessons and two hours of ballets.In th evening, they watch TV at school. At the weekends, there are dance classes on Saturday mornings, and then they are free with their friends at school  1. How old are...
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Read the text, and answer the questions

                        The Royal Ballet School, London

There are only 25 places for the new students every school year. Students are from 11 to 16 years old, and there are boys and girls. It''s a bording school.

On weekdays, there are four hours of lessons and two hours of ballets.In th evening, they watch TV at school. At the weekends, there are dance classes on Saturday mornings, and then they are free with their friends at school

 

 

1. How old are students ?

.......................................................

2. Are there 25 students at the school ?

.......................................................

3. Are they only boys at school ?

.........................................................

4. How many hours of lessons are there on weekday ?

.........................................................

5. How about hours of ballets ?

............................................

6.Are there dance classes on Saturdays ?

...................................................

7. Are the students free on Sundy ?

......................................

8. Are there at home in the evening ?

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toan quoc te nhaQuestion 1:There are two parallel lines in the figure. What is the value of x?  Answer: x = Question 2:ABC and RTS are similar triangles.The value of x is Question 3:If x<0 and 5x+8+|3x|=0 then x=Question 4:I am a multiple of 70 between 400 and 600. My tens digit is odd. Who am I?Answer: Question 5:How many triples of integers (a,b,c) are there such that  ? Answer:  triples.Question 6:Each of the 37 students in the grade 8 at a school has one dog or one cat or both a dog and a...
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toan quoc te nha

Question 1:
There are two parallel lines in the figure. What is the value of x? 

 Answer: x = 

Question 2:


ABC and RTS are similar triangles.
The value of x is 

Question 3:
If x<0 and 5x+8+|3x|=0 then x=

Question 4:
I am a multiple of 70 between 400 and 600. My tens digit is odd. Who am I?

Answer: 

Question 5:
How many triples of integers (a,b,c) are there such that 
 ? 
Answer:  triples.

Question 6:
Each of the 37 students in the grade 8 at a school has one dog or one cat or both a dog and a cat. Twenty students have a dog and 24 students have a cat. 
How many students have both a dog and a cat?
Answer:  students.

Question 7:
The sum of 2 positive integer numbers is greater than their product if the smaller number is 

Question 8:
How many different real numbers satisfy the following equation?
 
Answer: 

Question 9:
The area of trapezoid ABCD is 180   .The altitude is 8 cm,AD is 10 cm,and BC is 17 cm.
What is AB,in centimeters?

Answer:  cm.

Question 10:
There are 115 cars in a village of 26 families. Each family has either 4 or 5 cars. 
How many families have 4 cars? 
 Answer:  families.

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