1. Cho hình thang ABCD có góc C = góc B = 90 độ

AB=BC=1/2CD=2cm

Tính độ dài đường chéo và cạnh bên của hình thang

2. Cho hình thang ABCD. AB//CD, DB là phân giác góc D, BD vuông góc BC , AD=3cm , góc D =60 độ

Tính độ dài đáy lớn và các cạnh bên , đường chéo và đường cao của hình thang

Mai mk cần r cảm ơn nhae

1. ( Vẽ hình)Cho tứ giác ABCD có:

góc A : góc B:góc C:góc D =1:2:3:4

a. Tính các góc của tứ giác ABCD

b. C/m tứ giác ABCD là hình thang

c. Gọi giao điểm của AD và DC là E. Tính các góc của tam giác CDE

2. Cho hình thang MNPQ có:

MN//PQ, góc M=3* góc Q, góc P - góc Q =80 độ

tính các góc của hình thang

Exercise 3: Choose the corect answer in the parentheses

1. Every one of the students (is, are) required to take the final test.

2. None of animals at the zoo (is, are) free. All of them (is, are) in enclosures
3. A numbers of students at the university (is, are) approximately 10,000.
4. One of the chief materials in bones and teeths (is, are) calcium.
5. ( Do, does) all of the children have their books?
6. ( Do, does) all of this homework have to finished by tomorrow?
7. Why ( was,were) some of the students excutes from the examination?
8. Why ( was,were) one of the students excutes from the examination?
9. What percentage of the earth’s surface (is, are) covered by water?
10. What percentage of the people in the world (is, are) illiterate?
11. ( Do, does) any of you know the answer to that question?
12. There (isn’t, aren’t) any letters in the mail for you today.
13. There (isn’t, aren’t) any mail for you today
14. There (is, are) a lot of problem in the world
15. There (is, are) a fly in this room. Where’s the flyswatter?
16. There (is, are) over 600,000 kinds of insects in the world.
17. How many kinds of birds (is, are) there in the world?
18. Why (isn’t, aren’t) there a hospital close to those villages?
19. There (is, are) a green pen on Tim’s desk.
20. There (is, are) a blue pen and a yellow notebook on Sue’s book.
21. There (is, are) some pens and a notebook on Jack’s desk
22. The United States ( has,have) a population of 250 million
23. The new about Mr. Hogan (is, are) surprising
24. Massachutts (is, are) a state in the Northeastern part of the UnitedState.
25. Physics(seek,seeks) to understand the mysteries of the physical world.
26. Statistics (is, are) a branch of mathematics
27. The Statistics in that report on oil production (is, are) incorrect
28. Fifteen minutes (is, are) maximum length of time allowed for the exam.
29. Twenty dollars (is, are) an unreasonable price for the necklace.
30. Many people in the world (do,does) not have enough to eat.
31. The police (is, are) prepared in case there is a riot.
32. The English (is, are) proud, independent people.
33. English (is, are) not my native language.
34. Many Japanese ( commutes, commute) to their places of work.
35. Portugues (is, are) somewhat similar to Spainish, (isn’t, aren’t) it?
36. The poor (is, are) helped by government program
37. John, along with twenty friends (is, are) planning a party.
38. The picture of the soldiers (bring, brings) back many memories.
39. The quality of these recordings (is, are) not very good.
40. If the duties of these officers (isn’t, aren’t) reduced, there will not be enough time to finish the project.
41. The effects of ciggarette smoking ( has,have) been proven( chung minh) to be extremely harmful.
42. “ The use of credit card in place of cash ( has,have) increased rapidly in recent years.

43. living expenses in this country, as well as in many others, (is, are) at an all time high.

44. Mr. Jones, accompanied(cung voi) by several members of the committee, ( has,have) proposed some changes of the rules.
45. The levels of intoxication (vary, varies) from the subject to subject.
46. neither Bill nor Mary (is, are) going to play tonight.
47. Anything (is, are) better than going to another movie tonight.

mk đang cần gấp cảm ơn nhae

Exercise 2: Choose the corect answer in the parentheses

1. The weather in the southern states ( gets, get) very hot during the summer.
2. The result of Dr. Noll’s experiment( was,were) published in a scientific journal.
3. Bob and his friends( is,are) coming to the anniversary party tomorrow night.
4. Every man, woman, and child (is,are) protected under the law.
5. Washing the dishes (is, are) the children’ job
6. A lot of the students (is, are) already here.
7. Some of the furniture in our apartment (is, are) secondhand
8. Some of the desks in the classroom (is, are) broken.
9. At least three-quarters of that book on famous Americans (is, are) about people who lived in the 19th century
10. One of the coutries I would like to visit (is, are) Italy.
11. Some of the cities I would like to visit (is, are) Rome and Vience
12. Each student in the class (has, have) to have a book.
13. Each student in the class (has, have) to have a book.
14. None of the students ( was,were) late today.
15. the number of students in this room right now (is, are) twenty.
16. A number of students in the class ( speaks,speak) English well.
17. There (is, are) some interesting pictures in today paper.
18. There (is, are) an incorrect statement in that newspaper article.
19. The United States (is, are) lacated in North America.
20. Economics (is, are) Don’s favourite subjects.
21. Ten minutes (is, are) more than enough time to complete this exercise.
22. Most people (likes,like) to go to the zoo.
23. The police (is, are) coming. I’ve already called them.
24. Japanese (is, are) very difficult for English speakers to learn.
25. the Japanese (has, have) a long and interesting history.
26. The old in my country (is, are) cared for by their children and grandchildren.
27. This exercise on singular- plural agreement of subjects and verbs (is, are) easy.
28. The extent of Jane’s knowledge on various complex subjects ( astounds. Astound: lam kinh ngac) me.
29. The subjects you will be studying in this cource (is, are) listed in the syllabus.
30. Massachutes andConnecticut (is, are) located inNew England.
31. Only the black Widow spider, or all of the spiders in the United States, ( has,have) caused death among human being.
32. The professor and the student ( agree, agrees) on that point.
33. Almost every professor and student at the Universary ( approves, approve) of the choice or Dr.Brown as the new president
34. Each girl and boy in the sixth- grade class( has,have) to do a science project.
35. Getting to know students from all over the world (is, are) one of the best parts of my job.
36. Annie had a hard time when she was coming home from the store because the bag of groceries ( was,were) too heavy for her to carry.
37. where ( do, does) your parents live?
38. Why ( was,were) Susan and Alex late the meeting?
39. (Is, are) having the respondsibility for taking care of pets good for young children?
40. Some of the fruit in this bowl (is, are) rotten
41. Some of the apples in that bowl (is, are) rotten
42. Half of the students in the class (is, are) from Arabic- speaking countries.
43. Half of this money ( belong, belongs) to you.
44. A lot of students in the class (is, are) from Southeast Asia.
45. A lot of clothing in those stores (is, are) on sale this week.
46. One of my best friends (is, are) coming to visit me next week.
47. Each boy in this class ( has,have) his own notebook.

Giúp mk với, mk đag cần gấp

Thanks

Bai1: Thực hiện phép nhân:

a) 3xy(4xy^2-5x^2y-4xy)

b) (2x-1)(4x^2+2x+1)

c)(3x+2)(9x^2-6x+4)

Bài 2: Tìm x biết

a) (15x-5)(4x-1)+(3x-7)(1-16x)=81

b) (3x-2)(2x-3)-x(6x-4)=11

c) (2x^2-5)(x+1)-(2x-1)(x^2-3)-3x^2=6

d) (2x-1)(3x-1)-(2x-3)(9x-1)=0

Bài 3: a) Cho a+b+c=2P

Chứng minh rằng: 2bc+b^2+c^2-a^2=4P(P-a)

b) Cho M=(x-a)(x-b)+(x-b)(x-c)+(x-c)+(x-a)+x^2

Tính M theo a,b,c biết x=1/2a+1/2b+1/2v

Bài 1:Cho tam giác ABC cân tại A. Đường cao AH. Trên đoạn AH lấy điểm D sao cho AD=2/3 AH. Trên tia đối tia HD lấy điểm G sao cho HD=HG

a. Chứng minh BD=CD=HG

b. Chứng minh tam giác ABG= tam giác ACG

c. Cho BC = 8cm,AH=9cm. Tính DH và BD

Bài 2: Cho tam giác ABC vuông tại A. Vẽ Phân giác BM. Từ M kẻ MN vuông góc với BC

a. Cho AB=6cm,AC=8cm. Tính BC

b. Chứng minh tam giác BAM=tam giác BNM

c. Tia NM cắt BA tại P. chứng minh tam giác MAP=tam giác MNC

d. Gọi K là trug điểm của PC. Chứng minh 3 điểm B,M,K thẳng hàng