Một đồng hồ có tiếng chuông ngân rất dài, thời gian giữa hai tiếng chuông là 3 giây. Ban đêm, ta cần bao nhiêu giây để biết giờ khi đồng hồ báo 11 giờ ?

2 câu trả lời

Một đồng hồ có tiếng chuông ngân rất dài, thời gian giữa hai tiếng chuông là 3 giây. Ban đêm, ta cần bao nhiêu giây để biết giờ khi đồng hồ báo 11 giờ ?

 Đáp án + giải thích 

ta cần bao nhiêu giây để biết giờ khi đồng hồ báo 11 giờ là :

                         (11 × 2 ) -  × 4 = 84 ( giây )                                

    Vậy ta cần 84 giây để ta biết giờ khi đồng hồ báo 11 giờ    

              No war                      No copy                

                              xin hay nhất                           

                     Chúc bn học giỏi nha !                    

 

Đáp án:

 `84`

Giải thích các bước giải:

Thời gian để đồng hồ báo `11` giờ là:

`[( 11 xx 2 ) - 1] xx 4 = 84 ( giây )`

Đáp số : `84` giây.

Câu hỏi trong lớp Xem thêm

1. Chọn đáp án thích hợp nhất (A, B, C hoặc D) để hoàn thành mỗi câu sau

11. Jane never stays up late but Bill……………….

A. does B. doesn’t C. is D. are

12. Bill: “What a lovely house you have!” John: “………………”

A. No problem! B. I think so C. That’s right D. Thanks. Hope you’ll drop in

13. This papaya is green. It is not ………………..

A. cooked B. yellow C. good D. ripe

14. There is a ………………. behind my house.

A. big beautiful flower garden B. garden flower big beautiful

C. beautiful big flower garden D. big beautiful garden flower

15. Some people play video games at home. ……………….. play them in arcades.

A. Other B. Others C. Another D. Each other

16. What ……………….. awful weather! It’s so cold and wet.

A. a B. an C. the D. 

17. My tooth doesn’t stop hurting. I’ll go and see the ………………..

A. doctor B. teacher C. dentist D. actor

18. I …………… it difficult to learn English well.

A. make B. find C. feel D. get

19. A friend of ……………….. is going to visit me next week.

A. my B. I C. mine D. me

20. Many people can write poems, but only ……………….. can be

come good poets.

A. afew B. few C. a little D. little

21. Washington D.C is ………………. capital of ………………. United States.

A., the B. the,  C. the, the D. , 

22. Marie Curie learnt to read and wrtie ................................. she was four years old.

A. while B. as soon soon C. when D. why

23. The shirts here are ................................. more expensive than those at the bookshop on the corner.

A. very B. quite C. extremely D. much

24. ................................. ruler is this? Mine or yours?

A. Who’s B. Whose C. Who D. Which

25. We can learn more about the undersea world ................................ Costeau’s invention of the diving vessel.

A. because B. because of C. thanks to D. thanks for

GIÚP MIK MIK SẼ VOTE 5 SAO VÀ CHO HAY NHẤT CHO BẠN LM ĐẦU TIÊN

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VII. Read the passage. Then answer the questions. (1.0 point) Mai and Hoa are students. They live in Viet Nam. There are four seasons in a year in their country. They are spring, summer, fall and winter. In the spring, the weather is usually warm. Sometimes it is cold, but not very cold. There are many flowers in this season. After spring, it is the summer. In the summer, the days are long and the nights are short. They often go on vacation in the summer. Fall is a nice season. The weather is often cool. In the winter, it is usually very cold. The days are short and the nights are long. They always wear warm clothes in the winter. Questions: 1. How many seasons are there in their country? What are they? =>……………..……………………………………………………………………………………… 2. What is the weather like in the spring? =>………………..…………………………………………………………………………………… 3. What do they often do in the summer? =>…………………..………………………………………………………………………………… 4. Are the days long or short in the winter? =>………………..…………………………………………………………………………………… 5. Why do they always wear warm clothes in the winter? =>………………..……………………………………………………………………………………

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