A = \(x^2y.xy^2\) + 1

A = \(x^3y^3\) + 1

A = (\(xy\) )\(^3\) + 1

Thay \(x=2;y=2\) vào biểu thức A ta có:

A = (2.2)\(^3\) + 1

A = 4\(^3\) + 1

A = 16 + 1

A = 17

My brother is crazy about playing football ?

My brother Crazyabout phaying football.

a, \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

b, \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)

Theo PT: \(n_{H_2}=\dfrac{3}{2}n_{Al}=0,3\left(mol\right)\)

⇒ V_H2 = 0,3.24,79 = 7,437 (l)

c, \(n_{HCl}=3n_{Al}=0,6\left(mol\right)\)

\(\Rightarrow C_{M_{HCl}}=\dfrac{0,6}{0,2}=3\left(M\right)\)

Theo a thấy thì đây là bài nghe, e bổ sung tư liệu nhé

Câu 1, văn bản trên thuộc thể loại truyện cười dân gian vì nội dung mang tính gây cười, phê phán thói nói khoác thông qua tình huống phóng đại vô lí

Câu 2, câu cái nồi ấy dùng để làm gì mà to vậy là câu hỏi thông thường vì người nói thực sự muốn biết mục đích sử dụng của cái nồi, không nhằm khẳng định hay bộc lộ cảm xúc ẩn ý

Câu 3, chủ đề của văn bản là phê phán thói nói khoác, khoe khoang quá mức và tạo tiếng cười bằng cách phóng đại sự việc một cách phi lí

Ta có
2(x^3 − x) = y^3 − y
⇔ 2x(x − 1)(x + 1) = y(y − 1)(y + 1)

Vì (x, y) = 1 nên x và y không có ước chung

Thử các giá trị nhỏ của x

x = 1
⇒ 2(1 − 1) = 0
⇒ y^3 − y = 0
⇒ y(y − 1)(y + 1) = 0
Vì y nguyên dương nên y = 1
Thỏa mãn (1,1) = 1

x = 2
⇒ 2(8 − 2) = 12
⇒ y^3 − y = 12
⇒ y = 3 vì 27 − 3 = 24 > 12, y = 2 thì 8 − 2 = 6 < 12, không có y nguyên

x = 3
⇒ 2(27 − 3) = 48
⇒ y^3 − y = 48
Thử y = 4 thì 64 − 4 = 60 > 48, y = 3 thì 27 − 3 = 24 < 48, không có nghiệm

Với x ≥ 2 thì vế trái tăng nhanh hơn và không tồn tại y nguyên dương thỏa mãn

Vậy nghiệm nguyên dương duy nhất là
x = 1, y = 1

Môn học

Dear [Name],

I hope you are doing well. We are delighted to invite you to join us in celebrating the upcoming Tet Holiday, the traditional Lunar New Year of Vietnam. This special occasion is a time for family gatherings, cultural activities, and sharing good wishes for the year ahead.

The celebration will take place on [date] at [location], featuring traditional food, music, games, and cultural performances. It would be our honor to have you participate and experience the festive atmosphere with us.

Please let us know if you are able to attend. We look forward to celebrating together.

Best regards,

[Your Name]

Phạm vi từ vựng như nào thế e

1. They donated 200 books to children in rural areas last month.(Make a question for the underlined info) 
How many books did they donate to children in rural areas last month?
2. My mother eats a lot of fruit, and she eats a lot of vegetables too.(Combine into a simple sentence) 
My mother eats a lot of fruit and vegetables.
3. Rock is not like country music. (Rewrite the sentence, using different from) 
Rock is very different from country music.
4. They drank a lot of wine at the party last night. (Make questions for the underlined part.) 0.5pt 
How much wine did they drink at the party last night?
5. I think rock music is more popular than jazz. (Rewrite the sentence so that it means the same as the first one) 
I think jazz music isn’t as popular as rock music.
6. They sold the house in the countryside last year. (Make a question) 
What did they sell in the countryside last year?
7. My brother/ eat/ much sweetened food/last night, so/he have/stomachache (Complete the sentence) 
My brother ate much sweetened food last night, so he has a stomachache.
8. You are active, and you are sporty, too (Rewrite the sentence using “BOTH”) 
You are both active and sporty.
9. Listening to music gives him pleasure. (Rewrite the sentences, using the given words.) 
He enjoys listening to music.
10. She is more beautiful than her younger sister.( Rewrite the sentences, using the given words.) 
Her younger sister is not as beautiful as her.

1.They donated 200 books to children in rural areas last month.(Make a question for the underlined info)

→ How many __________books did they donate to children in rural areas last month?__________________________________________________________

2.My mother eats a lot of fruit, and she eats a lot of vegetables too.(Combine into a simple sentence)

→ My mother_____eats a lot of fruit and vegetables____________________________________________________________

3.Rock is not like country music. (Rewrite the sentence, using different from)

→ Rock is very_____different from country music_________________________________________________________________

4. They drank a lot of wine at the party last night. (Make questions for the underlined part.) 0.5pt

→ ………Câu này e thêm phần underlined nhé………….…………………………………………………………………………

5. I think rock music is more popular than jazz. (Rewrite the sentence so that it means the same as the first one)

→ I think jazz music isn’t as…popular as rock music…………………………………………………………………

6. They sold the house in the countryside last year. (Make a question)

→ …When did they sell the house in the countryside ?…………………………………………………………………………………

7. My brother/ eat/ much sweetened food/last night, so/he have/stomachache (Complete the sentence)

→ ………My brother ate so much sweetened food last night, so he had a stomachache……..……………………………………………….……………………..

8. You are active, and you are sporty, too (Rewrite the sentence using “BOTH”)

→ You………are both active and sporty……………………….………………………….…………………….. .

9. Listening to music gives him pleasure. (Rewrite the sentences, using the given words.)

→ He enjoys ……listening to music………………………….………………………….…………………….. .

10. She is more beautiful than her younger sister.( Rewrite the sentences, using the given words.)

→ Her …younger sister is not as beautiful as her…………………………….………………………….…………………….

số mol của Zn là: n = m/M = 13/65 = 0,2 (mol)

a. khối lượng acid tham gia PỨ là: m = nM = 0,2 x 98 = 19,6 (g)

b. khối lượng muối ZnSO4 tạo thành là: m = nM = 0,2 x 161 = 32,2 (g)

c. thể tích khí H2 sau PỨ là: V = 24,79n = 24,79 x 0,2 = 4,958 (L)