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23 tháng 1 2023

\(\overrightarrow{AB}.\overrightarrow{CB}=AB.CBcosB=2a.a\sqrt{3}.cos60=a^2\sqrt{3}\)

cho mình xin giải thích vì sao chọn mấy câu này với ,mình biết làm mà không biết cách giải thích1. She's not only beautiful _________ intelligent.a. but also               b. but                      c. however              d. yet2. I was very tired, ________ I determined to walk on to the next village.a. therefore             b. however             c. and                     d. or3. You can come here either on Monday__________ on Friday.a. or                        b....
Đọc tiếp

cho mình xin giải thích vì sao chọn mấy câu này với ,mình biết làm mà không biết cách giải thích

1. She's not only beautiful _________ intelligent.

a. but also               b. but                      c. however              d. yet

2. I was very tired, ________ I determined to walk on to the next village.

a. therefore             b. however             c. and                     d. or

3. You can come here either on Monday__________ on Friday.

a. or                        b. nor                      c. both                    d. and

4. The lecture was _______ interesting and instructive.

a. as                        b. either                  c. neither                d. both

5. _______their small size, the cameras take good pictures.

a. In spite of           b. Despite of                     c. Because              d. And

6. She could not decide_______ to drive_______ to jump into water.

a. both/ or               b. not only/ but also         c. either/ or            d. whether/ or

7. Flying is not only faster, _______ safer than traveling by car.

a. also                               b. so                       c. and                     d. but also

8. Beth can play the guitar_______ the violin.

a. also                               b. so                       c. but also              d. and

9. _______his physical handicap, he has become a successful businessman.

a. Although            b. In spite of           c. Despite               d. b or c

10. I like bananas, _______ my brother doesn’t

a. because               b. and                     c. but                      d. even though

11. She closed the door_______ left for the city.

a. and                      b. but                     c. or                        d. therefore

12. The mail comes at ten o'clock every day_______ Sunday.

a. except                 b. although             c. or                        d. and

13. We need wither a nail_______ a screw to hang this picture.

a. and                      b. or                        c. both                    d. but

14. It's raining, _______ I can't go to the beach.

a. so                        b. or                        c. but                      d. and

15. An effective paragraph must _______ be unified and ordered but also complete.

a. in addition                    b. either                  c. not only              d. as well

16. _______ his poor English, he managed to communicate his problem very clearly.

a. Although            b. Even though       c. though                d. In spite of

17. He is saving_______ he can go on vacation.

a. so that                 b. so                       c. unless                 d. that

18. The flight was canceled_______ the weather conditions were bad.

a. because of          b. due to the fact that        c. thanks      d. that

19. _______ Marge, three couples are invited

a. Addition             b. Besides              c. Next                   d. Moreover

20. It was still painful, _______ I went to see a doctor.

a. but                      b. or                        c. so                        d. however

21. We know_______ him and his wife.

a. either                  b. neither                c. both                    d. as well

22. He was the best in class at Maths and English; _______ he was the best footballer in the school.

a. moreover            b. however             c. or                        d. so

23. Geography is a very interesting subject; _______ very few people study it thoroughly.

a. and                     b. however             c. or                        d. so

24. It was very wet_______ I decided not to go

a. and                     b. but                      c. or                        d. so

25. I'll offer it to Tom. _______, he may not want it.

a. Even though       b. As                      c. When                  d. However

26. _______ we lived in town, we often went to the theater

a. After                   b. When                 c. For                      d. Or

27. _______ I sympathize with your point of view, I cannot accept it.

a. While                 b. Although            c. But                     d. a or b

28. How can you expect your children to be truthful_______ you yourself tell lies?

a. when                   b. therefore             c. because               d. since

29. Take a map with you _______ you lose your way.

a. if                         b. in case                c. so that                 d. so

30. The play was very boring, _______ they walked out.

a. so                        b. if                        c. when                   d. while

31. He hasn't written to us_______ he left.

a. when                   b. for                      c. because               d. since

32. I never take and umbrella_______ it's raining heavily.

a. unless                 b. if                        c. otherwise            d. or

33. He got a new alarm clock_______ he'd get up on time.

a. because               b. and                     c. so that                 d. so

34. He agreed to go climbing_______ he hated heights.

a. despite                b. in spite of           c. so                        d. although

35. I couldn't unlock it_______ I had the wrong key.

a. when                   b. while                  c. so as                   d. because

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18 tháng 10 2021

các bạn  giúp mình với, mình đang cần gấp ạ

 

19 tháng 10 2021

A B A' B'

5 tháng 4 2021

Để làm dạng này , bạn làm như sau :

Vì bạn biết 1 giờ = 60 phút; 1 phút =60 giây nên là

Trước hết bạn lấy số 0,8325 (số chỉ giờ) nhân 60 nhé = 49,95

Bạn lấy phần nguyên của nó trước dấu phẩy là 49 , điền vảo chỗ chấm trước phút.

Cái phần thập phân sau dấu phẩy là 0,95 bạn tiếp tục nhân 60 = 57.

Bạn điền 57 vào phần chỗ chấm trước giây.

Vậy 0,8325 giờ=49 phút 57 giây

0,8325 giờ = 49 phút 57 giây

The last time Hoa was seen was on her birthday.

22 tháng 2 2022

Cấu trúc của câu là gì thế ạ

2 tháng 11 2023

10.C 

11.B

10:

\(a+b=50^0+40^0=90^0\)

=>\(sina=cosb;sinb=cosa;tana=cotb;cota=tanb\)

=>sina=cosb

=>Chọn C

11:

Xét ΔABC vuông tại A có \(AC=BC\cdot sinB\)

=>\(AC=12\cdot sin30=6\)

=>Chọn B