k trước 3 cái 

LƯU Ý

Các bạn học sinh KHÔNG ĐƯỢC đăng các câu hỏi không liên quan đến Toán, hoặc các bài toán linh tinh gây nhiễu diễn đàn. Online Math có thể áp dụng các biện pháp như trừ điểm, thậm chí khóa vĩnh viễn tài khoản của bạn nếu vi phạm nội quy nhiều lần.

Chuyên mục Giúp tôi giải toán dành cho những bạn gặp bài toán khó hoặc có bài toán hay muốn chia sẻ. Bởi vậy các bạn học sinh chú ý không nên gửi bài linh tinh, không được có các hành vi nhằm gian lận điểm hỏi đáp như tạo câu hỏi và tự trả lời rồi chọn đúng.

Mỗi thành viên được gửi tối đa 5 câu hỏi trong 1 ngày

Các câu hỏi không liên quan đến toán lớp 1 - 9 các bạn có thể gửi lên trang web h.vn để được giải đáp tốt hơn.

lúc trước mình leve 39

Bạn ơi, bài ktra bạn ko nên đăng lên hỏi đâu, bạn phải tự làm để giáo viên còn biết để mà giúp bạn chứ, đi thi ai hộ bạn đây

 buổi sáng bán được

750 x 10 : 100 = 75m

buổi chiều bán được

750 x 18 : 100 = 135m

cả ngày bán được

135 + 75 = 210m

Cả 2 buổi bán được số phần trăm là: 10%+18%=28%

Cả ngày bán được số vải là: 750:100x28= 210(m)

       Đáp số: 210 m

 

trần bảo nam LÀM CHUẨN ĐẤY

Coi chiều dài cũ là là 100% thì chiều dài mới so với chiều dài cũ là : 

    100 % + 10%= 110% 

coi chiều rộng cũ là 100% thì chiều rộng mới so với chiều rộng cũ là : 

   100% - 90% = 10% 

diện tích hình chữ nhật mới so với diện tích hình chữ nhật cũ là 

    90/100 x 110/100 = 90/100 = 99% 

diện tích hình chữ nhật cũ bị giảm đi :

      100% - 90% = 1% 

                          Đáp số : 1%

S hình trụ = S xung quanh + S 2 đáy

- S xung quanh = chiều cao x đáy

- S 2 đáy = S 2 hình tròn

S hình cầu = S hình tròn

Ko có khái niệm S hình trụ và S hình câu đâu bạn ơi! Chỉ có giới thiệu thui

có mà mokona

1. Letters are typed in the office by Mary.

2. You’ll be helped by his father tomorrow.

3. The human life has completely been changed with science and technology.

4. This bottle was broken by Peter.

5. English is being learnt in the room.

6. My mind can’t be changed.

7. I hadn’t been told about it.

8. Her telephone number isn’t known.

9. The children will be brought home by my students.

10. I was sent a present last week.

11. We were given more information.

12. All the workers of the plan were being instructed by the chief engineer.

13. Tea can’t be made with cold water.

14. Some of my books have been taken away.

15. The meeting will be held before May Day.

16. The engine of the car has to be repaired.

17. The window was broken and some pictures were taken away by the boys.

18. A lot of money is spent on advertising every day.

19. A story is going to be told by teacher.

20. A cake is being cut with a sharp knife by Mary.

21. The woman with a red hat was looked at by the children.

22. The victims have been provided with food and clothing.

23. English is spoken in almost every corner of the world.

24. This machine mustn’t be used after 5:30 p.m.

25. After class, the chalk board is always erased by one of the students.

26. Is English taught here?

27. Will she be invited to your wedding party?

28. Has the work been finished by Tom?

29. Were some exercises given by the teacher?

30. Has the window of the laboratory been changed?

Cre: gg

#Jen

 

1. Letters are typed in the office by Mary.2. You’ll be helped by his father tomorrow.3. The human life has completely been changed with science and technology.4. This bottle was broken by Peter.5. English is being learnt in the room.6. My mind can’t be changed.7. I hadn’t been told about it.8. Her telephone number isn’t known.9. The children will be brought hnh độ tiếng Anh lớp 4 số 1ome by my students.10. I was sent a present last week.11. We were given more information.12. All the workers of the plan were being instructed by the chief engineer.13. Tea can’t be made with cold water.14. Some of my books have been taken away.15. The meeting will be held before May Day.16. The engine of the car has to be repaired.17. The window was broken and some pictures were taken away by the boys.18. A lot of money is spent on advertising every day.19. A story is going to be told by teacher.20. A cake is being cut with a sharp knife by Mary.21. The woman with a red hat was looked at by the children.22. The victims have been provided with food and clothing.23. English is spoken in almost every corner of the world.24. This machine mustn’t be used after 5:30 p.m.25. After class, the chalk board is always erased by one of the students.26. This dish is brought to me (by the waiter).27. These postcards are sent to us(by our friend).28. This story was told to them(by their grandmother) when they visited her last week.29. This train ket was ordered for Tim's mother.20. The special cameras weren't showed to me.

@sherry 

HT~~~(^^)

Tom gets the room cleaned by his brother.Nina had her assignment typed by a friend.Eli will have her hair cut by a hairdresser.They had the thief arrested by the police.Are you going to have your washing machine repaired by the mechanic?I must have my back checked by the doctor.She will have milk bought by John tomorrow.I have the story told by him again.The new grammar was copied into her notebook by the student.Several tourists have been attacked by monkeys in Nha Trang.The chair was moved into the bedroom. Some cake and candies were given to Lily by Tommy.A new car is going to be bought by my parents next year. When will your homework be done? When is your hair going to be cut?Who was that letter sent by?Is a textbook brought by Anna?I wonder whether Elise or Beth will be chosen for the position by the interviewer. Why wasn’t he helped?How can that door be opened?Is French taught here?Has a new dress for your party this weekend been bought?Must be the room cleaned before 3pm?                                                                                                                                               xl bn nhưng mik chỉ tìm đc thế thôi

\(\frac{2}{4}+\frac{5}{4}=\frac{7}{4}\)

= \(\frac{7}{4}\).

~~~~~~ MK NHA ~~~~~~~~

Số cần tìm là :

\(\frac{2}{4}\)+   \(\frac{5}{4}\)=   \(\frac{7}{4}\)

                  Đáp số : .............