\(A=\frac{1}{a}+\frac{1}{b}+\frac{1}{c}\ge\frac{\left(1+1+1\right)^2}{a+b+c}=\frac{9}{1}=9\)

Min A = 9 khi 1/a =1/b =1/c => a =b =c = 1/3

Đó là một đại lí lớn

1.Giun chuẩn bị bò.

2.Thu mình làm phồng đoạn đầu , thun đoạn đuôi.

3. Dùng toàn thân và vòng tơ làm chỗ dựa, vươn đầu về phía trước.

5 câu về bản thân :

I’m a generous and easy-going person but when it comes to work I’m a competitive perfectionist. I’m also an optimistic and outgoing person so I have many friends and other social relationships. I enjoy reading, writing and doing math. I decided to become a Civil Engineer because I have always been fascinated by bridges, buildings, and skyscrapers. A degree in Civil Engineering enables me to achieve my goals and also gives me an opportunity to make a difference in the community.

5 câu về mẹ :

She is tall and rather thin. She is a warm kindly person with an oval face and a long-silky hair. My mother loves us very much. She is used to staying up late and getting up early to earn money and take care of us. She is strict thanks to that we are educated into a good person.

Thân cây