Bài 13: Vẽ hình theo cách diễn đạt sau:
a) Vẽ hai điểm A và B phân biệt.
) Vẽ đường b thẳng đi qua hai điểm A và B.
c) Lấy điểm C không thuộc đường thẳng AB, Vẽ đường thẳng AC và đường thẳng BC.

My name’s Quan. One of my best friends is Phong. He is my classmate and we always go to school together. Phong is twelve. He’s tall and rather thin. He has short curly black hair and brown eyes. Phong is funny and outgoing. I like being with him because he always makes me laugh. He is also very sporty and plays football and basketball very well. We often play basketball and football at the weekend. He loves music and he plays the guitar. I don’t play any instruments but I love music too. Phong doesn’t like computer games. He likes playing with his friends in the street. Phong is a very good student. His favourite subject is Maths. He’s not good at Science but he studies hard to pass it. 

1.How old is Phong?

2.What does he look like ?

3.What do Phong and Quan often play at the weekend ?

4.Does Phong like compurter games ?

5.Is Phong good at Science ?

a) 3\(^7\).27\(^5\).81\(^3\)

b)36\(^5\):18\(^5\)

c)24.5\(^5\)+5\(^2\).5\(^3\)

d)125\(^4\):5\(^8\)

a^4:a(a =/ 0)

a)  a^4:a(a#0)

b)9^8:3^2

a^4.a.a^2

16^3.2^4