chưa đủ 20

chưa đủ 20

I have seen that movie twenty times.

I think I have met him once before.There have been many earthquakes in California.

People have traveled to the Moon.People have not traveled to Mars.

Have you read the book yet?

Nobody has ever climbed that mountain.

Has there ever been a war in the United States?

Yes, there has been a war in the United States.

I have been to France.I have been to France three times.

I have never been to France.

I think I have seen that movie before.

He has never traveled by train.

Joan has studied two foreign languages.

Have you ever met him?

No, I have not met him.

You have grown since the last time I saw you.

The government has become more interested in arts education.

Japanese has become one of the most popular courses at the university since the Asian studies program was established.

My History teacher for this school year is Ms. Lan, and we are all happy to study with her. She will turn 38 this year, but she still does not intend to get married or even have a boyfriend. She says that her life is for teaching and training students, and she feels it better to stay with her parents. She is a short, slim and beautiful woman despite her age. She loves to wear colorful ao dai to school, and we can count that maybe she has up to 30 different ones. Ms. Lan is a gentle and kind person, so she uses a really soft voice to give lectures, and the whole class must be very quiet in order to hear exactly what she is saying. Besides those lectures, she usually chats with us about her life and other funny things, so we feel very comfortable when studying with her. She is our teacher, but it seems that we are more worried about her than vice versa. Although she is happy to be alone, we all hope that she will find her true love soon.

sai

B=-5/9+8/15+-2/11+4/9+7/15

=>B=(-5/9+4/-9)+(8/15+7/15)-2/11

=>B=(-5/9+-4/9)+1-2/11

=>B=-1+1-2/11

=>B=-2/11

Vậy B=-2/11

đúng nè

sai sai

hình như sai rùi bạn ạ

quả cỏ lào. quả rau tàu bay, hạt thừng mức, cây bồ công anh, quả chò