Cho ABC nhọn có AB< AC và hai đường cao AD, BE cắt nhau tại H
a) CM: tam giác ADC ~ tam giác AEH
b) Lấy điểm M trên cạnh AB sao cho góc ADM = góc ABE. CM: góc AHM = góc ABC và 3 điểm C,H,M thẳng hàng

đây là bài nâng cao nha                                                                                                                                           tìm x biết: x-1/2019+x-2/2020=x-3/2021+x-4/2022                                     

làm sao để giấu 1 con gà 75kg

Cho hình thang cân ABCD,
có AD//BC, AD < BC và AB
vuông góc với AC, AB = 3 cm,
AC = 4 cm
a) Viết hệ thức liên hệ giữa 3 cạnh của tam giác ABC
b) Tính độ dài BC
c) Tính độ dài BD và DC

Cho ABC vuông tại A, AB = 5 cm, AC = 12 cm . AM là đường trung tuyến.
a/ Tính độ dài BC, AM.
b / Trên tia AM lấy điểm D đối xứng với A qua M . CM: AD = BC.
c / Từ điểm A vẽ đường thẳng song song với BC , đường thẳng này cắt DC tại điểm E . Gọi G là giao điểm của AC và ME . CMR : G là trọng tâm ADE .
d / ABC  cần thêm điều kiện gì để ABDC là hình vuông.

Làm thế nào các vật liệu siêu dẻo như graphene có thể được ứng dụng trong việc tạo ra các thiết bị điện tử siêu mỏng?

1+1

ai kb fb nch khum

viết bài văn ( khoảng 400 chữ ) nêu suy nghĩ của em về sự đồng cảm, sẻ chia trong cuộc sống

ai chơi blox fruri ko kêt bạn chơi cùng

chứng minh sự phân hóa đa dạng của khí hậu Việt Nam (theo chiều Bắc Nam và Đông tây phân hóa theo đọ cao) Giải thích sự phân hóa đó

Cổng của trường Bách Khoa Hà Nội có dạng một parapol,khoảng cách giữa hai chân cổng là 8m và chiều cao của cổng tính từ một điểm trên mặt đất cách chân cổng 0,5m là 2,93m . "Từ đó tớ tính ra được chiều cao của cổng parabol đó là 12m". sau một hồi suy nghĩ bình nói: "Nếu dữ kiện như bn nói< thì chiều cao của cồng parabol mà bn tính ra ở trên là ko chính xác." Duawj vào thông tin mà An đọc đc, hãy tính chiều cao của cổng trường ( làm tròn đến hàng đơn vị )

Chỉ ra và nêu tác dụng của biện pháp tu từ nhân hóa được sử dụng trong đoạn thơ sau : Đồng làng vương chút heo mayMầm cây tỉnh giấc, vườn đầy tiếng chimHạt mưa mải miết trốn tìmCây đào trước cửa lim dim mắt cười

Câu 1. (2 điểm): Hãy thiết kế sơ đồ lắp đặt mạng điện gồm: Nguồn điện 220V,
aptomat 2 cực để đóng, cắt nguồn điện và bảo vệ an toàn cho mạch điện, 2 công tắc
hai cực điều khiển 2 bóng đèn sáng, tắt độc lập và một ổ cắm điện để cấp điện cho
các đồ dùng điện trong gia đình.

Rút ra bài học kinh nghiệm từ phong trào Tây Sơn đối với công cuộc xây dựng và bảo vệ Tổ quốc hiện nay

1.      What ___ your favorite subject at school?
A. was                        B. were                       C. is                            D. are

2.      He always ___ coffee in the morning.
A. drink                      B. drinks                    C. drinking                D. drank

3.      I ___ to the park yesterday.
A. goes                       B. going                    C. went                       D. go

4.      She ___ a letter when I called her.
A. writes                    B. writing                  C. wrote                     D. was writing

5.      They ___ to visit their grandparents next week.
A. are going               B. will go                   C. went                       D. goes

6.      I have two brothers, but neither of them ___ football.
A. play                       B. plays                      C. playing                  D. played

7.      The movie was so ___ that we couldn’t stop laughing.
A. funny                     B. funnier                  C. funniest                 D. fun

8.      She ___ (sit) by the window when I ___ (enter) the room.

A. sat / entered
B. was sitting / entered
C. sat / was entering
D. was sitting / was entering

9.      If I ___ enough money, I will buy a new laptop.
A. had                        B. have                       C. will have               D. having

10. I’m not sure where she is. She ___ in her room.
A. is studying            B. studies                   C. study                      D. was studying

11. We should prepare well ___ the exam.
A. in                           B. at                            C. for                          D. on

12. Which of the following is a subject that focuses on numbers, calculations, and problem-solving?

A. History                  B. Mathematics        C. Geography            D. Literature

13. I forgot ___ the homework yesterday.
A. doing                     B. do                           C. did                        D. to do

14. My brother is the ___ person in our family.
A. taller                      B. tall                         C. tallest                     D. most tall

15. Would you like ___ to eat?
A. something             B. anything               C. nothing                  D. everything

16. Which school subject involves the study of the past, including events, people, and civilizations?
A. Geography           B. History                  C. Chemistry             D. Foreign Language

17. I remember ___ him at the party.
A. see                         B. to see                     C. seeing                    D. saw

18. She promised that she ___ help me with my project.
A. will                        B. won’t                     C. would                    D. can

19. The students ___ excited about the school trip tomorrow.
A. is                            B. are                          C. was                        D. be

20. While he ___ TV, the phone rang.
A. watched                B. is watching           C. was watching       D. watches

21. While I ___ (sleep), someone ___ (knock) on the door.

A. slept / knocked
B. was sleeping / knocked
C. was sleeping / was knocking
D. slept / was knocking

22. If you don’t hurry, you ___ miss the bus.
A. would                    B. will                        C. can                         D. might

23. She ___ speak Spanish when she was five years old.
A. could                     B. can                         C. will                        D. may

24. In which subject do students learn about ecosystems, the human body, and animal life?
A. Biology                 B. Chemistry             C. Economics            D. History

25. This book is much ___ than the one I read last week.
A. interesting            B. more interesting   C. most interesting   D. interestingly

26. We___ (not/like) the movie we ___ (watch) last night.

A. didn’t like / watched
B. wasn’t liking / watched
C. didn’t like / was watching
D. wasn’t liking / was watching

27. He was tired, so he went to bed ___ dinner.
A. without                  B. before                    C. after                       D. instead

28. My parents ___ to Europe every summer.
A. travels                   B. travel                     C. traveling                D. traveled

29. While we ___ (wait) for the bus, it ___ (start) raining.

A. waited / started
B. were waiting / started
C. were waiting / was starting
D. waited / was starting

30. The cake smells ___. Did you bake it yourself?
A. good                      B. well                        C. better                     D. best

31. They ___ finish their project before the deadline.
A. have to                  B. should                   C. might                     D. mustn’t

32. The weather is ___ hot today.
A. extreme                 B. extremely             C. most extreme        D. more extreme

33. If it rains tomorrow, we ___ go hiking.
A. don’t                      B. didn’t                     C. won’t                     D. wouldn’t

34. She ___ her keys anywhere.
A. can’t find              B. couldn’t find        C. didn’t find             D. won’t find

35. He drives as ___ as a professional driver.
A. carefully               B. careful                   C. carelessly              D. careless

36. I _______ (study) for the test at 8 PM last night.
A. study                     B. was studying        C. studied                  D. had studied

37. We’re planning ___ to the beach this weekend.
A. to go                      B. going                     C. go                           D. went

38. While she _______ (cook), her friends _______ (wait) in the living room.

A. cooked / waited
B. was cooking / was waiting
C. was cooking / waited
D. cooks / waits

39. I’d better take my umbrella because it ___ rain later.
A. will                        B. is going to             C. might                     D. can

40. While I ___ (read) a book, my brother ___ (watch) TV.

A. read / watched
B. was reading / watched
C. was reading / was watching
D. read / was watching

II. Fill in the blank with the correct form of given word.

1.    There will be a ___________________ in this street. (meet)

2.    We see ___________________ girls there. (beauty)

3.    They enjoy the ___________________ atmosphere here. (peace)

4.    Ao Dai is the ___________________ dress of Vietnamese women. (tradition)

5.    It is an ___________________ program. (interest)

III. Mark the letter A, B, C, or D to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

1. A. develops      B. cars                        C. meets                     D. books

2. A. walks           B. kisses                    C. dances                   D. boxes

3. A. laughs          B. months                  C. washes                  D. works

4. A. watched       B. washed                  C. liked                      D. raised

5. A. stayed          B. preferred               C. joined                    D. painted

IV. Choose the correct answers to complete the passage

My best friend and I met on our first day at secondary school. At first, we didn’t talk much, but we soon discovered we liked the same subjects. We always did our homework together, especially (26) ______ English because it was our favorite class.

One day, while we (27) ______ for a test, she suddenly said she wanted to become a doctor. I was surprised because she had never talked about her future (28) ______ before. She said she (29)______ to help people and make a difference.

Now we are in high school. Things are different: we are busier and we don’t study together every day. But we still talk to each other whenever we have (30) ______ problem.

26
A. in 
B. on 
C. for 
D. about
27
A. study 
B. studied 
C.were studying 
D. studyed
28
A. plans 
B. plan 
C. planning 
D. planner
29
A. wants 
B. wanted 
C. is wanting 
D. was wanted
30
A. a 
B. an 
C. the 
D. any
V/ Rewrite these sentences without changing their meaning. (2 pts)

31. She started studying English five years ago.

→ She has _______________________________________.

32. It’s very cold, so we will stay at home.

→ If it __________________________________________.

33. My house is smaller than your house.

→ Your house _____________________________________.

34. I will do the homework. That is my promise.

→ I promise I _____________________________________.

VI/ Make questions for the underlined parts of these sentences (2 pts)

35. I was at school last Sunday.

→ __________________________________________?

36. She studies biology because she loves animals.

→ __________________________________________?

37. They went to the beach last Sunday.

→ __________________________________________?

38. I usually get up at 6 a.m.

→ __________________________________________?

 Giải giúp mình với ạ

chan qa ai show hinh hồi nhỏ cho t vs🤡