3x - 2 = 19

3x = 19 + 2

3x = 21

x = 21 : 3

x = 7

a, what

b, where

a, where

b,who

Cạnh hình vuông đó là:

320 : 4 = 80 (m)

Diện tích hình vuông đó là :

80 x 80 = 6400 (m²)

- Which floor did they go up?

- Who is the most interlligent student in the classroom?

- It's big and noisy there.

- We will eat sea food and drink Coca.

- How often do you go to the library?

- I think I will explore the cave.

- We sang and danced at the party last night.

- How did you go to the seaside?

Are those people from japan ?

What are these ?

- Tom is as heavy as Tim.

- This building is not as high as that building.

 - That river is as long as this river.

- This lake is not as deep as that lake.

- John plays soccer as skillfully as Peter .

- Linh doesn't speak English as well as Hoa.

gửi bé : ^^