1. The village is quiet and there was only a little traffic.

2.My friend soon got used to the new busy city traffic.

3.You shouldn't spend too much time  in the arcade.

4.The public library in the city has thousands of books.

5. We should spend time like playing video games.

6.Mai and Lan usually help their with each other work.

7.Everything in the city is too expensive the far.

8.The video games are fun but players must be careful.

9.He must take part in outdoor activities with his friends.

Giải :

a. Diện tích xung quanh là : 4 x 3 x 7=84 (dm^2)

Thể tích là:  10 x 7,5 x 20=1500 (cm^3)

b.Đổi : 1500 cm^3 = 1,5 lít.

Vậy trong hộp có 1,5 lít sữa

Giải :

a. Tổ của bác Diễm nhận đan : 1000 x 1/4 =250 (chiếc )

b.Rô-bốt đã chuyển tất cả : 250 x 3/2 = 375 (kg)

Giải