Gọi số gà là x (con/\(x\ne0;x< 36\))

Số chân của gà là: 2x

Số chó là: 36 - x

Số chân của chó là: 4(36-x)

Mà tổng só chân là 100 chân nên ta có phương trình:

2x + 4(36 - x) = 100

<=> 2x + 144 - 4x = 100

<=> (2x - 4x) + 144 = 100

<=> -2x = 100 - 144

<=> -2x = -44

<=> x = 22 (t/m)

Vậy số gà là 22 con, từ đó suy ra số chó là: 36 - 22 = 14 (con) 

vài của 2 bn đung đấy

\(\frac{12}{7}:x+\frac{2}{3}=\frac{7}{5}\)

\(\frac{12}{7}:x=\frac{7}{5}-\frac{2}{3}\)

\(\frac{12}{7}:x=\frac{11}{15}\)

\(x=\frac{12}{7}:\frac{11}{15}\)

\(x=2\frac{1}{7}\)

Vậy x = ..........

O Hen – ri là một nhà văn Mỹ chuyên viết truyện ngắn. Nhiều truyện của ông đã để lại cho bạn đọc những ấn tượng sâu sắc như:

A. Tên cảnh sát trên căn gác xép

B. Căn gác xép

C. Quà tặng của các đạo sĩ

D. Câu B và C đúng.

\(\frac{42}{25}:\frac{x}{5}=\frac{6}{5}\)

\(\frac{x}{5}=\frac{42}{25}:\frac{6}{5}\)

\(\frac{x}{5}=\frac{7}{5}\)

\(\Rightarrow x=\frac{7\cdot5}{5}=7\)

a) Ta có:

2^3 = 8; 3^2 = 9

Do 8<9 => 2^3<3^2

b) 2^4 = 16

4^2 = 16

=> 2^4 = 4^2

c) 2^5 = 32

5^2 = 25

Vì 32>25 => 2^5>5^2

d) 2^10 = 1024

Vì 1024>100 => 2^10>100

1. Her house is smaller than my house

= My house is bigger than hers.

2. Do you have a cheaper computer than this?

= Is this the cheapest computer you have?

3. My father has fewer days off than Lan's father?

= Lan's father has more days off than mine.

4. My father is a more careful driver than I am

= My father drives more careful than me.

5. Her brother drives faster than her father

= Her father drives slower than her brother.

Trung hòa 0,89 gam hỗn hợp gồm axit fomic và một axit hữu cơ đơn chức X cần dùng 15 ml dung dịch NaOH 1M. Nếu cho 0,89 gam hỗn hợp trên tác dụng với lượng dư dung dịch AgNO₃ trong NH₃, đun nóng thì thu được 2,16 gam Ag. Tên gọi của X có thể là

A. axit acrylic       

B. axit metacrylic 

C. axit propionic  

D. axit axetic

1. The book was so good that  I couldn't put it down. => It was such a good book that I couldn't put it down.

2. The weather was so warm that I didn't need a coat. => It was such warm weather that I didn't need a coat.

3. The food was too hot for us to eat. => The food wasn't cool enough for us to eat.

4. The piano was too heavy for anybody to move. => It was such a heavy piano that anybody can't move it.

5. His feet are so big that he has difficulty finding shoes to fit him. => He has got such big feet that he has difficulty finding shoes to fit him.

6. The weather was so hot that we couldn't go out. =>The weather was too hot for us to go out

7. The milk is sweet. You can drink it. => The milk is too sweet for you to drink.

8. Unfortunately, he is so old that he can do nothing. => Unfortunately, he is not young enough to do nothing

9. The coffee is so hot that I can't drink it. => It is such hot coffee that I can't drink it.

10. I'm so excited that I can't think. => I'm too excited to think

11. The problem was so difficult that they couldn't understand it. => It was such a difficult problem that they couldn't understand it.

12. The novel is so short that we can finish reading it in a few hours. => It is such a short novel that we can finish reading it in a few hours.

13. My sister was so angry that she wouldn't speak to me. => My sister was too angry to speak to me.

14. You don't understand it because you are too young. => You aren't old enough to understand it.

15. He can carry this suitcase upstairs because he is very strong. => He is too strong to carry this suitcase upstairs.

\(\frac{a-b}{a+b}=\frac{-3}{8}\)