Tìm kết quả của:

E = \(\left[\left(a+b+c\right)^3+\left(a-b+c\right)^3+\left(-a+b+c\right)^3-\left(a+b+c\right)^3\right]:24abc\)

1. Thực hiện:

a)\(\left(3x^2y^3-5x^2y^2+6x^4y^7-9x^5y^4\right):x^2y^2\)

b) \(\left(6a^3-3a^2\right):a^2+\left(12a^2+9a\right):3a\)

Cho x, y, z là độ dài 3 cạnh của tam giác. CMR: A = \(4x^2y^2\) - \(\left(x^2+y^2+z^2\right)^2\) luôn luôn dương

Tìm x biết:

a) \(x^2\) + 6x + 5 = 0

b) \(2x^2\) + 3x - 5 = 0

Phân tích nhân tử:

a) \(5xy^{^{ }3}\) + \(30x^2z^2\) - \(6x^3yz\) - \(25y^2z\)

b) \(x^3\) + \(9x^2\) + 26x + 24

c) (\(x^2\) - x + 1)(\(x^2\) - x + 2) - 12

Đổi câu bị động thahf câu chủ đọng bằng 2 cách:

1. The teacher gave us two titles for thesis

2. Some body will have to tell him that news

Underline the mistake and correct it

1. Is the supermarket far to your house?

2. Is it the short way of walk?

3. It is too not far from the department store

4. The toy store is about 200 meter from the bakery

5. It is quite near from here, so you can walk

6. It takes tou one hours to drive there

7. It is only 250 meters from the shopping mall and the ATM

8. How far is the railway station to here?

9. How much is it from the first point to the last one?

10. What is the distance between your parent's house to your granparents's house?

Write sentences basing on avaiable words. Use it to describe distance

1. Joey's house/3 kilometrs/Danny's house

2. How far/department store/supermarket

3. Me/ only 100 meters/ Hoa

4. Her mother's office/ so far/ her father's factory

5. The dress shop/ near/ the toy store

6. Computer screen/ 50 centimeters/ my eyes

7. Coffee house/ 20 minute-walk/park

8. How far/Cuba/ Vietnam

9. There/ a police station/ near my school

10. Take me/ 15minutes/ go to school/ bike

Reorder the words make correct sentences:

1. is/here/from/How far/the/to/beach?/it

2. it/a/from/way/lng/Is/gas station?/the

3. kilometers/It/from/five/about/here./is

4. is/to/way/a/It/walk./long

5. a/Is/gas station/ there/here?/near

6. my/is/a/can/borrow/but/I/It/father's/car./long/way

7. the/Is/the/far/post office?/bank/from

8. is/from/bookstore/the/What/here?/nearest

9. here/Is/from/10-minute/to/walk/Vietcombank?/about/it

10. house/My/not/far/so/school,/is/so/I/walk./My/from

Rewrite the sentences without changing the meaning:

1. I spend 15 minutes walking from here to my school.

-> It

2. My house is not far from your house

-> It

3. You can come here by bus

-> You

4. My house is about 3 km from the National Library

-> It

5. What is the distance between the board and the first student's desk?

-> How

6. Is the movi theater far from the restaurant?

-> It