Giải:

Các số thỏa mãn đề bài là:

6788; 6878; 6887

7688; 7868; 7886

8678; 8687; 8768; 8786; 8867; 8876

A = {6788; 6878; 6887; 7688; 7868; 7886; 8678; 8687; 8768; 8786;8867;8876}

Diện tích xung quanh của phần chụp đèn là:
Sxq = 1/2 C. d = 1/2 * (4*20) * 22,4 = 896 (cm^2)

a; A =  5\(x^2\) + 10\(xy\) - 4\(x\) - 8y

   A = (5\(x^2\) + 10\(xy\)) - (4\(x\) - 8y) 

  A = 5\(x\).(\(x\) + 2\(y\)) - 4.(\(x+2y\))

 A =  (\(x+2y\)).(5\(x\) - 4)

B = 4\(x^2\) + 4\(x\) - y² + 1

B = (4\(x^2\) + 4\(x\) + 1) - y²

B = [(2\(x\))² + 2.2\(x\).1 + 1²] - y²

B = [2\(x\) + 1]² - y²

B = (2\(x+1\) - y)(2\(x+1\) - y)

Mary's school is near her place

Chọn C nha

Bài 1:

    This is a photo of my family. This is my father. He’s 40 years old. He’s a doctor. And this is my mother. She’s 35. She’s a doctor, too. These are my brother, Tom and my sister, Mary. Tom’s 10 and Mary’s 7. They’re pupils. 

1.     How many people are there in his family?

🡺    ……There are five people in his family……………………………………………………………

2     How old is his father?

🡺    ……His father is 40 years old……………………………………………………………

3.     What does he do?

🡺    ……He is a doctor……………………………………………………………

4.     How old is his mother?

🡺    ……His mother is 35 years old……………………………………………………………

5.     What does she do?

🡺    ……She is a doctor……………………………………………………………

6.     How old is his brother?

🡺    ………His brother is 10 years old…………………………………………………………

7.     How old is his sister?

🡺    ………His sister is 7 years old…………………………………………………………

8.     What do they do?

🡺    ………They are pupils…………………………………………………………

Bài 1:

    This is a photo of my family. This is my father. He’s 40 years old. He’s a doctor. And this is my mother. She’s 35. She’s a doctor, too. These are my brother, Tom and my sister, Mary. Tom’s 10 and Mary’s 7. They’re pupils. 

1.     How many people are there in his family?

🡺    ……There are 5 people in his family……………………………………………………………

2     How old is his father?

🡺    ………He is 40 years old…………………………………………………………

3.     What does he do?

🡺    ……He is a doctor…………………………………………………………

4.     How old is his mother?

🡺    ………She is 35 years old…………………………………………………………

5.     What does she do?

🡺    ……She is a doctor……………………………………………………………

6.     How old is his brother?

🡺    ……He is 10……………………………………………………………

7.     How old is his sister?

🡺    …………She is 7………………………………………………………

8.     What do they do?

🡺    ……………They are pupils……………………………………………………

1 decide

2 adventure

1 decide (âm 2 còn lại âm 2)

2 adventure (âm 2 còn lại âm 1)

eh

Mình có lúp 5 thui

Sorry :(

pls giups mik với

1. Do they go back home at thirty-five every day?

2. Where did the boys play soccer last Sunday?

3. They didn't play soccer yesterday afternoon, right?

4. Lan wasn't tall last year, right?

5. What time did he leave the party last night?

Mình chưa hiểu cho lắm?