ý thứ 2 và ý thứ 4, k nhé , mình nhanh nhất đó

Chọn các đáp án đúng:

(54 : 9) : 3 = 54 : (9 : 3)

(54 + 9) + 3 = 54 + (9 + 3)

(54 - 9) - 3 = 54 - (9 - 3)

(54 x 9) x 3 = 54 x (9 x 3

đúng cả mà 

Chiều rộng của căn phòng là: 

\(10\times\frac{3}{5}=6\left(m\right)\)

Diện tích căn phòng là: 

\(10\times6=60\left(m^2\right)\)

Diện tích mỗi viên gạch là: 

\(6\times5=30\left(dm^2\right)\)

Đổi: \(30dm^2=0,3m^2\).

Người đó cần số viên gạch là: 

\(60\div0,3=200\)(viên) 

= 54/6. [6/1.3.7 +6/3.7.9 +6/7.9.13 + 6/9.13.15]

=54/6 [1/1.3-1/3.7 + 1/3.7 - 1/7.9 + 1/7.9 - 1/9.13 + 1/9.13 -1/13.15]

=54/6[1/3- 1/13.15]

=54/6 .64/195

=192/65

540 bạn nhá

A

A

Ta có: \(54=6\cdot9=2\cdot3\cdot3\cdot3=2\cdot3^3\)

Chọn A.

tích trên có 1000 số hạng 
=-54.(1+2+...+999+1000)
=-54.500500
=-27027000

=-53 *(-52)*...*0*...*945

=0

k minh nha

1 was writting -> was wrote

2 build->built

3 mik ko bt

4 was opening-> opened

5 mik ko bt

6teach-> be taught

7 were-> was

8 building-> built

9 wroten-> written

10 am -> X

 mình nghĩ vậy thôi nếu sai thì sorry nha 

Tìm lỗi sai và sửa:

1. This book was writting by Jack London, an American writer

=> the

2. Two new houses have just been build here.

=> built

3. The picture was painting by Michael when we came.

=> painted

4. A new shop was opening on Main Street last week.

=> opened

5. A new department store is building in our twon at the moment.

=> is being built

6. Will they teach math by Mr Quang next Sunday?

=> be taught

7. Nobody were injured in the accident, were they?

=> was / was it

8. A new hospital has been building in my neighborhood recently.

=> built

9. Hamlet was wroten by William Shakespeare.

=> written

10. I am always made wash my hands before every meal.

=> make to wash

Câu 10 là made to wash : bị bắt phải làm gì nhé

bang 197100

bang 197100

bang 197100

It may seem unbelievable, but it is quite possible that the days of secretary are coming to an end. There is evidence to suggest that professional people such as doctors, lawyer and managers are dealing with  correspondence perrsonally rather than having a secretary do it. And the reason is simple: modern technology.

Until recently, secretaries were extremely useful for typing letters to customers and clients, for arranging meetings and dealing with travel  arrangements. Answering the telephone was also another of their major responsiblities.. However, with the introduction of email and mobile phones, managers are able to do more and more of these activites themselves. Many companies currently have fewer secretaries than they did five years ago. However, employees does not seem to have increased as a result. Rather, secretaries are finding new positions as personal assistants and even managers themselves.