Giúp mk làm bài nay vs mấy bạn lớp 8 nhé

bài 1

Cho biểu thức A=\(\left(\dfrac{1}{\sqrt{x}-3}-\dfrac{1}{\sqrt{x}+3}\right):\dfrac{3}{\sqrt{x}-3}\)

a) tìm điều kiện xác định .rút gọn A

b) với giá trị nào của x thì A > \(\dfrac{1}{3}\)

c) tìm x để A nhỏ nhất

bài 2

chứng minh các đẳng thức sau:

a) 2\(\sqrt{2}\left(\sqrt{3}-2\right)+\left(1+2\sqrt{2}\right)^2-2\sqrt{6}=9\)

b)\(\sqrt{2+\sqrt{3}}+\sqrt{2-\sqrt{3}}=\sqrt{6}\)

c)\(\sqrt{\dfrac{4}{\left(2-\sqrt{5}\right)^2}}-\sqrt{\dfrac{4}{\left(2+\sqrt{5}\right)^2}}=8\)

1. Laura never (win) a beauty contest.

2. I (listen) to the new Tom Waits CD yet.

3. (you see) any good films recently?

4. The population of India (increase) since 1992.

5. You ever (write) a love letter for Valentine’ Day?

6. You ever (meet) a famous person?

7. We already (see) the film at home.

8. My boy friend (give) up smoking for 2 months.

9. You can have that newspaper. I (finish) with it.

10. There is no more cheese. I (eat) it all, I’m afraid.

11. The bill isn’t right. They (make) a mistake.

12. Don’t you want to see this program? It (start).

13. It’ll soon get warm in here. I (turn) the heating on.

14. Someone (take) my bicycle.

15. You ever (eat) Sushi?

16. She (not/come) here for a long time.

17. I (work) here for three years.

18. You ever (be) to New York?

19. You (not/do) yor project yet, I suppose.

20. I just (see) Andrew and he says he already (do) about half of the plan.

21. I just (decide) to start working next week.

22. He (be) at his computer for seven hours.

23. She (not/have) any fun for a long time.

24. My father (not/ play) any sport since last year.

25. I don’t live with my family now and we (not/see) each other for five years.

26. I just (realize) that there are only four weeks to the end of term.

27. How long (you/know) each other?

28. (You/ take) many photographs ?

29. (She/ eat) at the Royal Hotel yet ?

30. He (live) here all his life.

31. She (visit) Hanoi several times this year.

32. He (lose) all his fortune in gambling.

II. Bài về nhà : Present Perfect Simple or Present Perfect Continuous

Exercise 1

1. ___________________ (they / arrive) already?

2. Lucy ___________________ (run) 2000 metres today.

3. I ___________________ (clean) all morning – I’m fed up!

4. How long ___________________ (you / know) Simon?

5. Look! Somebody___________________ (break) that window.

6. Sorry about the mess! I ___________________ (bake).

7. How many times ___________________ (you / take) this exam?

8. He ___________________ (eat) six bars of chocolate today!

9. Julie ___________________ (cook) dinner. Let’s go and eat!

10. The students ___________________ (finish) their exams. They’re very happy.

11. Where have you been? ___________________ (you / play) tennis?

12. Iona is exhausted these days. She ___________________ (work) too hard recently.

13. Luke ___________________ (never / be) abroad.

14. I ___________________ (wait) for three hours already !

15. ___________________ (you / finish) your homework yet?

16. How long ___________________ (you / be) a lawyer?

17. I ___________________ (read) your book all day. It’s very interesting, but I’m only on chapter 2.

18. She ___________________ (drink) ten glasses of water!

19. I ___________________ (have) my dog for sixteen years.

20. Help, I ___________________ (lose) my wallet! How can I get home?

EXERCISE 2

1. ___________________ (you / buy) your train ticket yet?

2. The kitchen is a complete mess! What ___________________ (the children / do)?

3. Julie ___________________ (learn) to drive for six years!

4. My brother is an actor. He ___________________ (appear) in several films.

5. How much coffee ___________________ (she / drink) this morning?

6. Simon ___________________ (write) three books.

7. I ___________________ (do) everything I needed to do today! Hurray!

8. It ___________________ (not / rain) all summer, so the garden is dead.

9. I ___________________ (read) your book. Here it is, thank you.

10. She ___________________ (forget) how to get to my house.

11. I ___________________ (work) in the garden all day and I need a rest.

12. She ___________________ (make) three cakes. They look delicious!

13. David feels great these days. He ________________ (get) up early lately.

14. We ___________________ (always / hate) rush hour traffic.

15. Recently, I ___________________ (study) a lot. My exams are in a few weeks.

16. We ___________________ (write) this book for months and months.

17. I ___________________ (always / love) chocolate.

18. I ___________________ (want) to go back to university for a long time.

19. What’s that delicious smell? ___________________ (you / cook)?

20. I ___________________ (watch) seven films this week!

Ai giúp mk với help me mk pro ngu TA

Change the following sentences into passive voice.

1. Mr Tuan delivered the speech yesterday.

2. Turn off the computer at night.

3. I clean the floor everyday.

4. My mother bought this dress this morning.

5. She did this exercise two days ago.

6. They send him abroad to study chemistry.

7. Nobody has used this room for a long time .

8. Someone has stolen my bike.

9. He has just received a letter from his parents.

10. She will buy this house.

11. They are building my house.

12. Lan was making my new dress at this time yesterday.

II. Put the verbs in the brackets into the correct tense.

1. She (come) .......................................... to France 2 years ago.

2. I (just send) ................................................. the letter.

3. He (work)........................................... for that company for 5 years.

4. I (graduate).................................... from Hue University last year.

5. Tom (play )...................................... football every afternoon.

6. I (cook) ....................................... in the kitchen when he came in

7. Mai (attend) .................................... a meeting at the moment.

8. (help) ................................. him whenever he needs.

9. Mary (find) ................ a five – pound note while she (walk) .....................to school yesterday.

10. I (just finish) ..................... reading War and Peace .It's a brilliant book.

11. I (not be) ........................ at work tomorrow ,I'm taking the day off.

12. How long ............... you (be ) ........ a nurse, Mss Lan? For 5 years.

13. While Peter (drive) ....................... home late last night he (run) ...................... out off the petrol.

15. She always (get) ........................... up early to study her lessons.

16. Nylon (invent) .............. in early 1930s by an American chemist, Julian Hill. Other scientists (work) ........... with his invention and finally on 27 Octorber 1938, nylon (introduce).................. to the world .It was cheap and strong and immediately (become) ................. successful, especial in making old ladies' stockings. During the Second World War , it (use) ................. to make parachutes and tyres.

Today, nylon (find) .................... in many things: carpets, ropes, seat bells, furniture, computers and event space parts for the human body. It ( play ) .................. an important part in our lives for over 50 years. Next year, about 2.6 million tons of nylon (manufacture) ...............

III. Make complete sentences using the given cues.

1. you / send / letter / yet ?

2. Nile / longest / river / in / world

3. Hoa / salary / high / than / Tom/s

4. He / work / hard / order/ pass / exam

5. Early this morning / children / decide / go / a run

6. Sydney opera / complete / 1973.

7. The road / join / two villages / be / narrow.

8. It / not difficult / translate / this sentence/ English

9. You / mind / lend / me / dictionary ?

10. New bicycle /make / Japan / be / expensive.

11. you / see / film / Jurassic Park / yet ?

12. The Mekong river / long / the Red river

13. Ba / interlligent / Nam

14. Sears Tower / short/ PETRONAS Twin Towers

15. Mexico city / big / in the world

16.Ba / good / in our class.

IV. Put the following verbs into the correct form- Ving or To- Inf.

17. She told me how (make )....................... the cake.

18. The man (stand) ......................... near the door is my brother.

19. Do you mind (tell) ............................ me her address ?

20. My father decided (go) ........................... abroad

21.Could you please tellme where (buy) ............... this book?

22. It's difficult (do) ............... this project?

V. Fill in the blank with a suitable word.

1. She was cooking ............... the phone rang.

2. Would you mind ............... I smoked here?

3. Mary used ............... be a good student.

em có bt hè ai giải hộ em vs mk ngu TA bỏ mịa nó ra

1. Where ___________you (live)____________?
I (live)______________in Hai Duong town.
2. What _______________he (do) ______________now?
He (water)_________________flowers in the garden.
3. What _______________she (do)_____________?
She (be)______________a teacher.
4. Where _________________you (be) from?
5. At the moment, my sisters (play)____________volleyball and my brother (play)________________soccer.
6. it is 9.00; my family (watch)___________________TV.
7. In the summer, I usually (go)______________to the park with my friends, and in the spring, we (have) _____________Tet Holiday; I (be)________happy because I always (visit) ______________my granparents.
8. ____________your father (go)_____________to work by bus?
9. How ___________your sister (go)___________to school?
10. What time _____________they (get up)_________________?
11. What ____________they (do)________________in the winter?
12. Today, we (have)______________English class.
13. Her favourite subject (be)__________________English.
14. Now, my brother (like)_________________eating bananas.
15. Look! Aman (call)_________________you.
16. Keep silent ! I (listen )____________________to the radio.
17. ______________ you (play)_________________badminton now?
18. Everyday, my father (get up)_________________at 5.00 a.m, but today, he (get up) __________________ at 6.00 am.
19. Every morning , I (watch)_________________tv at 10.00, but today I (Listen ) ________________ to music at 10.00.
20. Everyday , I (go) __________to school by bike but today I go to school by motorbike.
21. Every morning, my father (have) ______________a cup of coffe but today he (drink)______________ milk.
22. At the moment, I(read)_______________a book and my brother (watch)_______ TV.
23. Hoa (live)________________in Hanoi ,and Ha (live)________________in HCM City.
24. Hung and his friend (play)_______________badminton.
25. They usually (get up)___________________at 6.oo in the morning.
26. Ha never (go)_________________fishing in the winter but she always (do)_____________ it in the summer.
27. My teacher (tell)__________________Hoa about Math.
28. There (be)____________________ animals in the circus.
29. _______________he (watch)______________TV at 7.00 every morning?
30. What _____________she (do ) _________________at 7.00 am?
31. How old _________she (be)?
32. How ___________she (be)?
33. My children (Go)________________to school by bike.
34. We (go)_______________to supermarket to buy some food.
35. Mr. Hien (go)________________on business to Hanoi every month.
36. Ha (like)______________coffee very much, but I (not like)______________it.
37. She (like )________________Tea, but she (not like)____________________coffee.
38. I (love)_______________ cats, but I (not love)__________________dogs.
39. Everyday ,I (go)______________to school on foot, but today I (go)____________________to school by bike.
40. Who you _________________(wait) for Nam?
-No, I _______________________(wait) for Mr. Hai.
41. My sister (get)______________ dressed and (brush)_______________her teeth herself at 6.30 everyday.
42. Mrs. Smith (not live)_______________in downtown. She (rent)________________in an appartment in the suburb.
43. How _________your children (go)_________________to school everyday?
44. It’s 9 o’clock in the morning. Lien (be)________in her room. She (listen) _______________to music.
45. We_______________________(play) soccer in the yard now.
46. My father (go)___________ to work by bike. Sometimes he(walk)______________.
47. _________You (live)________near a market? _ It (be)____________noisy?
48. Now I (do)_____________the cooking while Hoa (listen)_______________to music.
49. At the moment, Nam and his friends (go)_______________________shopping at the mall.
50. In the autumn, I rarely (go)______________sailing and (go)__________to school.
51. I (write)_____________________________ a letter to my friend now.
52. At 12 a.m every day, I (have)______________lunch and (go)____________to bed.
53. On Monday, I (have)________________________ math and Art.
54. On Friday, I (have)______________________English.
55. At the moment, I (eat)______________an orange, and My sisters (Play)_______ Tennis.
56. _______her bag (be)?
- No, they(not be)______________.
57. What time _____________your children (go)____________ to school?
58. He (live)________________in HCM City.
59. What time___________your brother usually (get)___________up?
60. My house (be)_________in the city and it (be)_________small.
61. Every morning , we (have)__________breakfast at 7.00 am.
62. This (be)________a book and there (be)_________pens.
63. Mr. Quang (live)____________in the countryside. He (have)__________a big garden.
64. John (not have)______________Literature lesson on Friday.
65. What time _________you (start)___________your class?
66. ___________you (be) in class 12A3?
67. Mrs. Ha (learn)__________________in Hanoi, but she (not live)__________________ there.
68. My brother (not live )____________________in London; he (live )_______________ in Manchester.
69. Now Mr. Long (design ) ____________________his dream house.
70. He (like)_____________APPLES, but he (not like )_____________________bananas.
71. __________________she (like)______________apples?
72. Usually, I (have)_________________lunch at 12.00. -__________________you (have) ___________________lunch at 11.00?
73. He can (swim)_______________but I can’t(swim)_____________________.
74. At the moment, my sister (read)___________________ a comic book.
75. I (like )__________________ice-cream.
76. What ___________________Mr. Ha (live)_______________?
77. Monkeys can (climb)_________________ the tree.
78. Hang (go)__________________to the bookshop now because she ( want ) ___________to buy some books.
79. We (go) ______________to market and (buy)_________________some fruits.
80. Now, Lan (study)________________English and Lien (listen)______________to music.
81. Everynight , she (have)____________________dinner at 7.00 p.m.
82. Every year, I usually (go)______________________Vietnam.
83. In the summer, I sometimes (go)____________________swimming.
84. Every everning, my mother (like)___________ watching television.
85. Lan (have)_______________breakfast and (go)___________to school at 6.30 a.m.
86. We (not read)___________________after lunch.
87. Tom (be)___________my friend. He (play)______________sports everyday.
88. ______________your students (play)__________soccer every afternoon?
89. He (go)_____________to bed at 11.30 p.m.
90. They (go)___________home and (have)___________lunch.
91. ___________he (play)__________sports?
92. He (teach)_______________English in a big school in town.
93. Everyday she (go)____________to work by bike.
94. We usually (read)_________books, (listen)_________to music or (watch)_______TV.
95. Sometimes, I (play)__________badminton.
96. Ann (like)____________her job very much.
97. ___________your mother (walk)_________to the market?
98. Look! They (run)_________________________together.

Tìm x thuộc Z, biết:

a)  5 6 + 1 6 ≤ x ≤ 13 4 + 14 8

b)  − 5 6 + 8 3 + 29 − 6 ≤ x ≤ − 1 2 + 2 + 5 2

c)  79 15 + 7 5 + − 8 3 ≤ x ≤ 10 3 + 15 4 + 23 12