Rút gọn biểu thức sau

A=\(\dfrac{4+\sqrt{15}}{4-\sqrt{15}}\)+\(\dfrac{4-\sqrt{15}}{4+\sqrt{15}}\)

TAG_question

1 Im never called "scholar",....?

2.No one has come here,...?

3,she never works on sundays,....?

4,you have never been in italy,...?

5,That's Bob's,.....?

6,no one dided in the accident,....?

7,I'm usually right about the weather,....?

8,Nobody called on the phone,.....?

9,Everyone took the test,...?

10 There ARE A LOT OF PEOPLE HERE,....?

11 that is true story,....?

12. Let's go to the cinema tonight,....?

13.Everything is all right now,......

14 That is your umbreall,...?

15, I am invited,...?

16,You haven't lived here long,...?

17, You need to stay longer,.....?

18,You aren't homesick,...?

19,Children don't smoke cigarettes,....?

20, Coffe isn't good for children,...?

21, I am going to be late for the meeting,....?

22,He can't drive a car,....?

23,Minh won't drink beer,...?

24, They will come here tomorrow,....?

25,You have read this article on the website,.....?

26,Baird produced the firts TV picture in 1926,....?

27,Peter would like to come with us to the party,.....?

28,Those aren't Fred's books,.....?

29,You have never been to paris,......?

30,Something is wrong with Jane today,.....?

5. Work in groups. Take turns talking about your hobbies. Use the questions below and your own to help. (Làm việc theo nhóm. Lần lượt nói về sở thích của bạn. Sử dụng các câu hỏi dưới đây để giúp bạn.) Suggested answers (Câu trả lời gợi ý) 1. Collecting stamp. 2. When I was a child. 3. It's easy. Because I only ask for stamps from my relatives and friends when they have letters. 4. Yes, it is. Because it helps me know more about many other things in my country and in the world. 5. Yes, of course. Who do you think has the most exciting hobby? (Bạn nghĩ ai có sở thích thú vị nhất?)

giúp mk nha chiều nộp rùi

Tìm  I = ∫ x . e 3 x d x .

A.  I = - 1 3 x e 3 x - 1 3 e 3 x + C

B.  I = 1 3 x e 3 x - 1 3 e 3 x + C

C.  I = 1 3 x e 3 x + 1 3 e 3 x + C

D.  I = x e 3 x - 1 3 e 3 x + C

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