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15 tháng 10 2023

\(\dfrac{2}{35}< \dfrac{3}{47}\)

15 tháng 10 2023

ANSWER PLEASE

 

1 tháng 12 2015

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nhớ tick nha

19 tháng 2 2021

bạn cho đề như thế mình đọc không ra? :D chịu khó chụp rõ hơn hoặc gõ tay đi bạn

 

20 tháng 2 2021

xin loi ban nha

 

21 tháng 2 2016

Question 7:In your class, there are 54 students and there are 32 boy students.How many girl students are there in your class?Answer: There are 12 girl students. .

Mấy câu kia đâu

23 tháng 2 2023

Ta có : \(\dfrac{x}{15}\text{=}\dfrac{-1}{3}\)

\(\Rightarrow\dfrac{x}{15}\text{=}\dfrac{-5}{15}\)

\(\Rightarrow x\text{=}-5\)

23 tháng 2 2023

\(\dfrac{x}{15}\)=\(\dfrac{-1}{3}\)

⇒x.3=15. -1

⇒x.3=-15

⇒x   =-15 ; 3

⇒x   =-5

Vậy x=-5

Các bạn giúp mình với ạ , mình biết ơn nhìu lắm                                                   I. Fill in the blank with the correct form of verbs:1. He used ( go)………… fishing when he lived in the countryside.2. Mr. Minh (work)…………… for his company for 20 years.3..Hoa ‘s teacher asked her ( study)…………..harder.4. He’ll try his best ( improve)……………..English.5. I (receive)………………a letter from my mother yesterday.6. My brother hates ( listen)……….. to pop music.7. It’s very difficult...
Đọc tiếp

Các bạn giúp mình với ạ , mình biết ơn nhìu lắm                                                   I. Fill in the blank with the correct form of verbs:

1. He used ( go)………… fishing when he lived in the countryside.

2. Mr. Minh (work)…………… for his company for 20 years.

3..Hoa ‘s teacher asked her ( study)…………..harder.

4. He’ll try his best ( improve)……………..English.

5. I (receive)………………a letter from my mother yesterday.

6. My brother hates ( listen)……….. to pop music.

7. It’s very difficult (reach)………….. a decision.

8. Can you help me(move)…………….. this table.

9. Are you going (take)………. Part in this contest.

10.The Y& Y is planning to help the community by (encourage)………………all members to participate in a recycling program

11.Tom has a toothache. He ought (go)…………….. to the dentist.

12. She (live)……………………. in London since 1980

13. In England the sun (not shine)……………………. everyday.

14. The doctor advised him(give up)………………..(smoke)…………………..

15 The Red river (flow)…………….. to the Gulf of Tonkin.

16. He ( start )………………… working a day ago

17.. You should (practice)……………….your English more often

18. I’m going (travel)………………. To Ha Noi.

19. My mother used to (go)……………shopping

20.They (know)…………………each other for some months

21.Do you like (cook)………………….meals?

22. I (write)……………….the letter to Hoa since March

23.Can you (help)…………… me move this table?

1
31 tháng 12 2021

1. He used ( go) to go fishing when he lived in the countryside.

2. Mr. Minh (work) has worked for his company for 20 years.

3..Hoa‘s teacher asked her (study) to study harder.

4. He’ll try his best ( improve) improving English.

5. I (receive) received a letter from my mother yesterday.

6. My brother hates (listen) listening to pop music.

7. It’s very difficult (reach) to reach a decision.

8. Can you help me(move) move this table.

9. Are you going (take) to take Part in this contest.

10.The Y& Y is planning to help the community by (encourage) encouraging all members to participate in a recycling program.

11.Tom has a toothache. He ought (go) to go to the dentist.

12. She (live) has lived in London since 1980

13. In England the sun (not shine) doesn't shine everyday.

14. The doctor advised him(give up) to give up (smoke) smoking.

15 The Red river (flow) flows to the Gulf of Tonkin.

16. He (start) started working a day ago.

17. You should (practice) practice your English more often.

18. I’m going (travel) to travel to Ha Noi.

19. My mother used to (go) go shopping.

20.They (know) have known each other for some months.

21.Do you like (cook) cooking meals?

22. I (write) have written the letter to Hoa since March

23.Can you (help) help me move this table?
\(_{\text{sai cho mk xl}}\)

24 tháng 3 2022

lm câu mấy ạ

24 tháng 3 2022

Nếu được thì mong cả 3 câu luôn bạn nhé. 

5 tháng 10 2023

GIÚP EM VỚI NHA!!!

5 tháng 10 2023

\(4hm^24dam^2=40400m^2\\94hm^23dam^2=940300m^2\)

#\(Toru\)

NV
5 tháng 4 2022

Đặt \(N=n^4+4n^3+7n^2+6n+3=\left(n^2+n+1\right)\left(n^2+3n+3\right)\)

Do \(n\) và \(n+1\) luôn khác tính chẵn lẻ \(\Rightarrow n^2\) và \(n+1\) khác tính chẵn lẻ

\(\Rightarrow n^2+n+1\) luôn lẻ

Gọi \(d=ƯC\left(n^2+n+1;n^2+3n+3\right)\) \(\Rightarrow d\) lẻ

\(\Rightarrow n^2+3n+3-\left(n^2+n+1\right)⋮d\)

\(\Rightarrow2\left(n+1\right)⋮d\)

\(\Rightarrow n+1⋮d\)

\(\Rightarrow\left(n+1\right)^2⋮d\Rightarrow\left(n+1\right)^2-\left(n^2+n+1\right)⋮d\)

\(\Rightarrow n⋮d\Rightarrow n+1-n⋮d\Rightarrow d=1\)

\(\Rightarrow n^2+n+1\) và \(n^2+3n+3\) nguyên tố cùng nhau

Giả sử tồn tại m nguyên dương thỏa mãn: \(\left(n^2+n+1\right)\left(n^2+3n+3\right)=m^3\)

Hiển nhiên \(m>1\), do \(n^2+n+1\) và \(n^2+3n+3\) nguyên tố cùng nhau, đồng thời \(n^2+3n+3>n^2+n+1\)

\(\Rightarrow\left\{{}\begin{matrix}n^2+n+1=1\\n^2+3n+3=m^3\end{matrix}\right.\)

Từ \(n^2+n+1=1\Rightarrow\left[{}\begin{matrix}n=-1\\n=0\end{matrix}\right.\) đều ko thỏa mãn n nguyên dương

Vậy N luôn luôn ko là lập phương

9 tháng 4 2022

Em cám ơn thầy Lâm, giờ em mới đọc,  em hiểu rồi ạ!