Cho \(x=2+\sqrt{3}\)

Tính B= \(2x^5-8x^4-5x^3+31x^2-19x+1\)

Cho a,b,c ≠ 0 thỏa mãn abc=1 và \(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}=\frac{1}{a+b+c}\)

Tính M = (a-1) (b-1) (c-1)

Bài 1: Cho x, y, z thỏa mãn:

x,y, z ≠ 0 ;

-2xy+6yz+ 3xz=6 ;

x+2y-3z=4

Tính \(x^2 +4y^2 +9z^2\)

Bài 1: Cho a,b thỏa mãn \(a^2\) +\(ab^2-2b^4=0\) ; a,b≠ 0; \(b^2≠ 3a ; b≠ 0 ; b≠-2a\)

Tính A= \(\frac{a+2b^2}{3a-b^2}+\frac{ab-3b^2}{2ab+b^2}\)

Tag questions:

Tag questions: 1)Linh didn’t feel confident in her favorite clothes, _______________?

2)The two cities are not the same in some ways, _______________?

3)Her listening isn’t excellent, _______________?

4)Maryam couldn’t stay for longer time, _______________?

5)My sister has to make this room tidy, _______________?

6)This poet has mentioned the ao dai in poems, _______________?

7)Lan used to walk past the mosque on her way to primary school, _________?

8)Nobody wrote poems yesterday, _______________?

9)There are many religions in Malasia, _______________?

10)His children may swim, _______________?

11)Nam and Binh have to study harder, _______________?

12)Women to day often prefer to wear modern clothing at work, ____________?

13)The Parkers had a picnic on the river bank, _______________?

14)Our teachers have taken inspiration from some minorities, ______________?

15)Everything was OK, _______________?

16)Oh, hurry up, _______________?

17)Hung and I can eat those cakes, _______________?

18)You won’t be late, _______________?

19)Ba’s village lies near the foot of the moutain, _______________?

20)Daisy has seen that films several times, _______________?

21)Let’s forget unhappy things, _______________?

22)Her daughter doesn’t spend time surfing the web,_______________?

23)Those men never worked on a farm, _______________?

24)People of different ages like this magazine, _______________?

25)I am wearing wrong shoes, _______________?

26)Interactive TV is available now, _______________?

27)He did not miss the train, _______________?

28)Someone feels tired after the trip, _______________?

29)Hanh and you like living in a dormitory on campus, _______________?

30)Their son doesn’t have much time on computer, _______________?

Tag questions:

1.You have heard about that,.....................?

2.Nam did the work well,.........................?

3.He didn’t have to speak to me,.....................?

4.He won’t fall down,.............................?

5.You would’t like the window open,..................?

6.He used to beat his wife,............................?

7.She came very late,..................?

8.Come and see me tomorrow,.................?

9.I’d better go,....................?

10.There’sanexaminationtomorrow,.......................?

11.You can’t play tennis today,...........................?

12.She’s been studying English for twoyears,....................?

13.Your brother doesn’t like watchingTV,...................?

14.Let’s listen to the radio,...................................?

15.Mary is reading a book in herroom,.....................?

16.His parents won’t buy him a newgame,.................?

17.You’vejustusedthecomputer,.................................?

18.Turn off the television,............................?

19.I’m late for the party,.........................?

20.They never go to the theatre,................?

21.His mother is very proud of him,...............?

22.The lift isn’t working today,......................?

23.Nothing could be done,..................................?

24.Everybody is here,..............................?

25.Hedidn’twakeupthismorning,............................?

26.Baird didn’t produce the first TV picture before1920,............................?

27.There are many interesting programstonight,........................?