a) 2(3x - 1) = 10

6x - 2 = 10

6x = 10 + 2

6x = 12

x = 2

Vậy x = 2

b) \(\left(3x+4\right)^2\) - (3x - 1)(3x + 1) = 49

[\(\left(3x\right)^2\) + 2.3x.4 + \(4^2\) ] - [\(\left(3x\right)^2\) - \(1^2\) ] = 49

[9\(x^2\) + 24x + 16] - [9\(x^2\) - 1] = 49

9\(x^2\) + 24x + 16 - 9\(x^2\) + 1 = 49

24x + 16 + 1 = 49

24x + 17 = 49

24x = 49 - 17

24x = 32

x = \(\frac{32}{24}\) =\(\frac43\)

Vậy x - \(\frac43\)

a) 2(3x - 1) = 10

6x - 2 = 10

6x = 10 + 2

6x = 12

x = 2

Vậy x = 2

b) \(\left(3x+4\right)^2\) - (3x - 1)(3x + 1) = 49

[\(\left(3x\right)^2\) + 2.3x.4 + \(4^2\) ] - [\(\left(3x\right)^2\) - \(1^2\) ] = 49

[9\(x^2\) + 24x + 16] - [9\(x^2\) - 1] = 49

9\(x^2\) + 24x + 16 - 9\(x^2\) + 1 = 49

24x + 16 + 1 = 49

24x + 17 = 49

24x = 49 - 17

24x = 32

x = \(\frac{32}{24}\) =\(\frac43\)

Vậy x - \(\frac43\)

1) If you don't drink more water, you will get more acne.

2) My sister wants to see the terraced fields, so she is going to Sa Pa.

3) Unless he doesn't spend time on his phone, he won't complete his work.

1) If you don't drink more water, you will get more acne.

2) My sister wants to see the terraced fields, so she is going to Sa Pa.

3) Unless he doesn't spend time on his phone, he won't complete his work.

1) While I was sleeping, the phone rang.

2) We were shocked when the police was arranging our friend to the station.

3) Before my father leaves for work, he closes the door.

4) After I finish my homework, I go to bed.

1) While I was sleeping, the phone rang.

2) We were shocked when the police was arranging our friend to the station.

3) Before my father leaves for work, he closes the door.

4) After I finish my homework, I go to bed.

1) She was surprised when she found a golden coin in the garden.

2) I will go shopping as soon as I find my wallet.

3) He made a quick phone call to a client before he left the office.

4) He took a rest after he mowed the lawn.

1) She was surprised when she found a golden coin in the garden.

2) I will go shopping as soon as I find my wallet.

3) He made a quick phone call to a client before he left the office.

4) He took a rest after he mowed the lawn.

Hình ảnh bạn đăng lên đang bị lỗi nhé.

Question 1:

The cat eats its food faster than the dog.

Question 2:

Although he plays the guitar well, he doesn't like performing in front of others.