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16 tháng 2 2017

56

24 tháng 8 2019

There are 18 students have neither a dog or a cat

_ Study well _

12 tháng 2 2017

goi so hoc sinh chi co cho la:a

goi so hoc sinh chi co meo la:b

Theo bai ra, ta co:

\(\left\{\begin{matrix}a+19=52\\b+19=31\end{matrix}\right.\Leftrightarrow\left\{\begin{matrix}a=33\\b=12\end{matrix}\right.\)

\(\Rightarrow\)so hoc sinh co cho hoac meo hoac ca hai la: 33+12+19=64

so hoc sinh khong co ca cho lan meo la: 120-64=56(hs)

neu minh sai cho nao thi ban noi cho minh biet nhahaha

5 tháng 4 2016

37 students

6 tháng 5 2016

56

18 tháng 8 2016

ban co the giai ki hon duoc ko

16 tháng 2 2017

56

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...
Đọc tiếp

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.

0
5 tháng 11 2018

Nam has a lot of pets.

14 tháng 4 2017

He has two parrots and a rabbit. They are in the garden.