Bài 1: 
a) x - 10 là số nguyên âm lớn nhất có 3 chữ số 
b)  12 - 9x = 480 : 16
c) 25 - 3 ( x - 20 ) = 28 x  1^2021 : 2021^0
Bài 2:
Tìm số nguyên x biết 15 chia hết cho 2x + 3

3. Make questions for the bold words.

Ex: 0. Moon cake is a typical cake in Mid-Autumn Festival.

   what is a typical cake in Mid-Autumn Festival?

1. Mid-Autumn Festival is known as a festival for children.

__________________________________________________________________________________    ?

2. The Mid-Autumn festival is celebrated on the 15th day on the 8th lunar month.

When is celebrated in vn______________________________________________________________    ?

3.Traffic jam often happens here because there are so many vehicles on the street at rush hour and the road is so narrow.

__________________________________________________________________________________    ?

4. Yen Tu Festival is so fantastic and meaningful.

__________________________________________________________________________________   

5. New-rice Festival is often held in Vietnam annually.

__________________________________________________________________________________   

6. People often organize Hoa Ban Festival in Spring. 

Câu 7. Tại sao nói : Thế giới chúng ta đang sống thật rộng lớn và đa dạng ?