Tìm giá trị nhỏ nhất:

36x³+78x²+199x

Choose A.

1. I will help you arrange the president to meet you if you like.

2. Small children should not be left alone in a house.

3. Sue was walking to class when she lost her pen.

1. Collection

2. Convenient

3. Skillful

4. Safer

5. Friendship

6. Healthy

x+y+z=0

x²+y²+z²=14

x⁴+y⁴+z⁴=?

Last month you had a holiday overseas where you stayed with your friend. He has just sent you some photos of holiday. Write a letter to Tom. In your letter you should:

• thank him for the photos and holiday

• explain why you didn't write earlier

• invite him to come and stay with you

My best friend is ______. The first reason why I like her most is her nice appearance. She has long black hair and beautiful eyes. Not only does she have a pretty appearance but she also has good characteristics. When I feel sad, nervous or stressful, she is always by my side and encourage me to overcome difficult challenges in my life. I'm so grateful for it. Moreover, she once said that:" If oneday you feel like crying, call me. I don't promise that I will make you happier, but I can cry with you" In addition to that, we have many unforgetable experience. We share a lot of things such as dreams, hobbies,... I strongly believe that our relationship is lasting forever.