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8 tháng 10 2021

=AC+AD+BC+BD

8 tháng 10 2021

=AC+AD+BC+BD

30 tháng 12 2021

c: \(=6000+700+8=6708\)

a: =15x200=3000

21 tháng 3 2020

a. (a+b)-(c-d)-(a+d)

=a+b-c+d-a-d

=(a-a)+(d-d)+b-c

=0+0+b-c

=b-c

b.(a-b)-(d-b)-(c-d)

=a-b-d+b-c+d

=a-(b-b)-(d-d)-c

=a-0-0-c

=a-c

a: Ta có: ΔABC cân tại A

mà AM là đường trung tuyến

nên AM là đường phân giác

b: Xét ΔABE và ΔACF có 

AB=AC

\(\widehat{ABE}=\widehat{ACF}\)

BE=CF

Do đó: ΔABE=ΔACF

c: Xét tứ giác BKCH có 

M là trung điểm của BC

M là trung điểm của HK

Do đó: BKCH là hình bình hành

Suy ra: BK//CH; BK=CH

d: Ta có: BKCH là hình bình hành

nên CK//BH; CK=BH

11 tháng 10 2021

a: Xét tứ giác AECF có 

O là trung điểm của đường chéo AC

O là trung điểm của đường chéo EF

Do đó: AECF là hình bình hành

Mn ơi giúp em với, em cảm ơn !1. It rained all the time,  ……. was a great pity.          A. that              B. what                   C. which                         D. who2. She married a man …………. she  met on a bus.          A. whom              B. whose                    C. he                          D. which3. I’m sure I know the person ………… served us.          A. whom              B. who                    C. which                           D. whose4. The Red Lion is the pub in...
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Mn ơi giúp em với, em cảm ơn !

1. It rained all the time,  ……. was a great pity.

          A. that              B. what                   C. which                         D. who

2. She married a man …………. she  met on a bus.

          A. whom              B. whose                    C. he                          D. which

3. I’m sure I know the person ………… served us.

          A. whom              B. who                    C. which                           D. whose

4. The Red Lion is the pub in …………….. we met for a drink.

            A. it                B. that                     C. where                            D. which

5. The letter that I opened ……… wasn’t for me.

           A. X               B. it                     C. that                            D. which

6. I’m working on a firm ……… main office is in London.

           A. which              B. that                     C. whose                             D. whom

7. Natasha, ………. flat was burgled, spent the night at a friend’s house.

          A. who              B. whose                     C. which                             D. that

8. Students ……… get below-average exam results do not have the best prospects.

          A. what             B. whom                     C. who                             D. which

9. We passed the shops ………… windows were decorated for Christmas.

          A. the             B. their                     C. which                             D. whose

10.  I don’t agree with ……… you have just said.

         A. who             B. when                        C. which                                    D. where

11. The man to ………. She is married has been married twice before.

         A. whom             B. who                                           C. which                                    D. whose

12. That’s the house ….. I was born.

         A. in which             B. which                                         C. that               D. place

13.Tom……….is a monitor of the class, is also the captain of the football.

A. who                       B. which                  C. whom                   D. whose.

14. I saw the man……….owns that car walking towards the shop.

A. which                    B. whom                  C. who                      D. whose

15. The street…………leads to my school is very narrow.

A. who                       B. which                  C. whom                   D. whose

16. Bring me the clock………………..is over there.

A. whom                    B. which                  C. whose                   D. who

17. My friend, …………aunt is  nurse, would like to be a doctor someday.

A. who                       B.  whom                 C. which                    D. whose

18. The dog, ………..tail I stepped on, bit me.

A. who                       B. whose                  C. which                    D. whom

19. Please give this to the beggar…………….is at the door.

A. who                        B. which                  C. whom                    D. whose

20. My father gave me the doll…………..I had been hoping for.

A. who                        B. which                   C. whom                   D. which

21. Yesterday I met my friend…………….gave me a dog on my birthday.

A. who                        B. whose                   C. whom                   D. which.

22. Any boy………….disobeys the rules will be punished.

A. that B. which C. whom           D. who.

23. Budapest……….is on the Danube is a beautiful city.

A. where B whose C. when            D. which

24. The river from………….we get our water supply is nearly empty.

A. that B. which C. whom           D. where.

25. The boy…………father is in prison is my friend.

A. whom B. who C. whose          D. which

26. Do you know the driver………………took them to town last night?

A. which B. whom C. where           D. who

27. Anybody…………..is tired may leave.

A. whom B. who C. where            D. which.

28. He talked about the books and the authors………….interested him.

A. which B. who C. that                D. when

29. This is the book of …………….I was speaking.

A. which B. whom C. that                 D. where

30. The cat …………tail is long does not belong to me.

      A. whom     B. that C. which             D. whose

31. The man ________ spoke to John is my brother.

A. whom B. who C. whose D. which

32. I must thank the man from _____ I got the present.

A. who B. whom C. that D. which

33. It is a car ______ I bought last year.

A. whom B. who C. which D. whose

34. He is the man _______ son is a doctor

A. whom B. which C. who D. whose

35. I come from a city _______ is located in the southern part of the country.

A. who B. whom C. that D. whose

36. The film about _____ they are talking is fantastic.

A. who B. which C. whom D. that

37. That ’s the woman to _______ Jim used to be married.

A. who B. whom C. which D. that

38. The people who are waiting for the bus in the rain are getting well

A. waiting B. to wait C. waited D. wait

39. He is the boy _______ is my best friend

A. that B. whom C. who D. A& C

40. I have a message for people __________ by the traffic chaos.

A. to delay                    B. who delay            C. delayed  D. who delaying

41. I live in a pleasant room ____________ the garden.

A. to overlook        B. overlooking      C. overlooked D. which overlooking

42. Melanie was the only person __________ a letter of thanks.

A. wrote              B. written              C. to write            D. writing

43. The pilot was the only man __________ after the crash.

A. was rescued     B. rescued           C. rescuing          D. to be rescued

44. I met a lot of new people at the party ________ names I can’t remember.

A. whose B. which C. who D. whom

45. I talked to a woman __________ car had broken down on the way to the party.

A. which B. who C. whose D. whom

46.  Vicky, __________ name was missed off the list, wasn’t very pleased.

A. which B. whose C. who D. whom

47.  The picture was painted by Laura, ____________ is being shown in an exhibition.

A. which B. whose C. who D. whom

48. The concert ___________ we are looking forward is next Saturday.

A. which B. that C. whom D. A & B

49. I’ll see you near the post office ___________ we met the other day.

A. which B. where C. when D. why

50. The success of shared holidays depends on __________ you shared it with.

A. whose B. who C. whom D. which

 

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26 tháng 8 2021

Theo mình nè, bạn có thể tách các bài ra sau đó đăng lần lượt nha :))

26 tháng 8 2021

đăng giới hạn 15 câu thôi, bạn đăng 50 câu thì ko ai trả lời đâu