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24 tháng 5 2019

\(A=\frac{1}{3}.\left(\frac{3}{2.4.6}+\frac{3}{4.6.8}+...+\frac{3}{22.24.26}\right)\)

\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{4.6}+\frac{1}{4.6}-\frac{1}{6.8}+...+\frac{1}{22.24}-\frac{1}{24.26}\right)\)

\(A=\frac{1}{3}.\left(\frac{1}{2.4}-\frac{1}{24.26}\right)\)

\(A=\frac{1}{3}.\frac{77}{624}\)

\(A=\frac{77}{1872}\)

16 tháng 5

77/1872

27 tháng 4 2018

Nhớ rằng: \(\frac{n}{a.\left(a+n\right)}=\frac{1}{a}+\frac{1}{a+n}\)

Ta có: \(A=\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+...+\frac{1}{90}\)

           \(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{9.10}\)

Áp dụng công thức trên, ta có:

            \(A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{9}-\frac{1}{10}\)

             \(A=1-\frac{1}{10}=\frac{9}{10}\)

27 tháng 4 2018

\(Â=\frac{9}{10}\)

Odd one out1.  A.scarf                      B.sandals                   C.boots                  D.shoes2.  A.soccer                   B.tennis                      C.badminton         D.sport3.  A.elephant               B.animal                    C.dolphin              D.shark   4.  A.play                      ...
Đọc tiếp

Odd one out

1.  A.scarf                      B.sandals                   C.boots                  D.shoes

2.  A.soccer                   B.tennis                      C.badminton         D.sport

3.  A.elephant               B.animal                    C.dolphin              D.shark  

4.  A.play                       B.seafood                  C.sandcastle          D.beach ball

5.A.violin                      B.guitar                      C.music                  D.piano

6.  A.football                 B.table tennis            C.volleyball          D.play

7.  A.music                    B.english                    C.books                 D.physics

8.  A. party               B. invite                 C. complete         D. money

9.  A.flowers            B. visit                  C. clothes            D.sport

10.  A. their               B. me                      C. his                  D. our

11.  A. coat                B. sandals              C. boots              D. shoes

11.A.cycle                B.ski                      C.skate               D.chess

12.A. giraffe             B. seafood             C. dolphin           D. shark

13.A.play                B. badminton         C.football             D. chess      

14.  A.english           B.music                 C.subject          D.history

4
30 tháng 7 2021

Odd one out

1.  A.scarf                      B.sandals                   C.boots                  D.shoes

2.  A.soccer                   B.tennis                      C.badminton         D.sport

3.  A.elephant               B.animal                    C.dolphin              D.shark  

4.  A.play                       B.seafood                  C.sandcastle          D.beach ball

5.A.violin                      B.guitar                      C.music                  D.piano

6.  A.football                 B.table tennis            C.volleyball          D.play

7.  A.music                    B.english                    C.books                 D.physics

8.  A. party               B. invite                 C. complete         D. money câu này chịu

9.  A.flowers            B. visit                  C. clothes            D.sport câu này chịu

10.  A. their               B. me                      C. his                  D. our

11.  A. coat                B. sandals              C. boots              D. shoes

11.A.cycle                B.ski                      C.skate               D.chess

12.A. giraffe             B. seafood             C. dolphin           D. shark

13.A.play                B. badminton         C.football             D. chess      

14.  A.english           B.music                 C.subject          D.history

30 tháng 7 2021

nếu sai cho mình xin lỗi

1.  A.scarf                      B.sandals                   C.boots                  D.shoes

2.  A.soccer                   B.tennis                      C.badminton         D.sport

3.  A.elephant               B.animal                    C.dolphin              D.shark  

4.  A.play                       B.seafood                  C.sandcastle          D.beach ball

5.A.violin                      B.guitar                      C.music                  D.piano

6.  A.football                 B.table tennis            C.volleyball          D.play

7.  A.music                    B.english                    C.books                 D.physics

8.  A. party               B. invite                 C. complete         D. money

9.  A.flowers            B. visit                  C. clothes            D.sport

10.  A. their               B. me                      C. his                  D. our

11.  A. coat                B. sandals              C. boots              D. shoes

11.A.cycle                B.ski                      C.skate               D.chess

12.A. giraffe             B. seafood             C. dolphin           D. shark

13.A.play                B. badminton         C.football             D. chess      

14.  A.english           B.music                 C.subject          D.history

Name: Nguyễn Minh Quân     Class: 4CI. Correct the mistakes.1.     Where do your mother often buy this book?     ______________________________________2.     Are Tom studying?                            ______________________________________3.     Hoa not have good speaking skill.               ______________________________________4.     The young girl not writing the letter now.           ...
Đọc tiếp

Name: Nguyễn Minh Quân     Class: 4C

I. Correct the mistakes.

1.     Where do your mother often buy this book?     ______________________________________

2.     Are Tom studying?                            ______________________________________

3.     Hoa not have good speaking skill.               ______________________________________

4.     The young girl not writing the letter now.            ______________________________________

5.     Are Lam fond of listening to music?     ______________________________________

6.     They studies math.                             ______________________________________

7.     What you usually do in the morning?     ______________________________________

8.     They travel to London tomorrow.      ______________________________________

9.     The plane is land now.                       ______________________________________

10.            Why she is saying loudly?                      ______________________________________

2
24 tháng 8 2021

1. Where do your mother often buy this book? => Where does your mother often buy this book?
2. Are Tom studying? => Is Tom studying?
3. Hoa not have good speaking skill. => Hoa does not have good speaking skill
4. The young girl not writing the letter now. => The young girl is not writing the letter now.
5. Are Lam fond of listening music?=> Is Lam fond of listening to music?
6. They studies math=> They study math
7. What you usually do in the morning? => What do you usually do in the morning?
8. They are traveling to London. => Th ey are travelling to London.
9. The plane is land now.=> The plane is landing now
10. Why she is saying loudly?=> Why is she saying loudly?

24 tháng 8 2021

1. Where do your mother often buy this book?

=> Where does your mother often buy this book?
2. Are Tom studying English now?

=>Is tom studying English now?
3. Hoa not have good speaking skill.

=>Hoa doesn't have good speaking skill.

4. The young girl not writing the letter now.

=> That young girl isn't writing the letter now.

5. Are Lam fond of listening music?

=> Does Lam fond of listening to music?

6. They studies math once time a week.

=> They study math once time a week.

7. What you usually do in the morning?

=> What do you usually do in the morning?

8. They are traveling to London.

=>They are travelling to London.

9. The plane is land now.

=> The plane is landing now.

10. Why she is saying loudly?

=> why is she saying loudly?

Hok tốt

4 tháng 8 2021

1C 2A 3A 4D 5C

11 tháng 1 2024

Bài nghe: 

1. How can I get to the bookshop?

(Làm thế nào để tôi có thể đến hiệu sách?) 

2. How can I get to the campsite?

(Làm thế nào để tôi có thể đến khu cắm trại?) 

Lời giải chi tiết:

1. c      2. a

12 tháng 1 2024

a. 

What are these animals? (Đây là những con vật gì?)

They’re peacocks. (Chúng là những con công.)

I like them. (Tôi thích chúng.)

b. 

Why do you like peacocks? (Vì sao bạn thích con công?)

Because they dance beautifully. (Bởi vì chúng múa rất đẹp.)

10 tháng 1 2024

a.

What does your mother do? (Mẹ bạn làm nghề gì vậy?)

She’s a nurse. (Bà ấy là y tá.)

b.

Where does she work? (Bà ấy làm việc ở đâu?)

She works at a nursing home. (Bà ấy làm việc ở viện dưỡng lão.)

10 tháng 1 2024

Bài nghe: 

1. A: What does your mother do? (Mẹ bạn làm nghề gì?)

   B: She's a farmer. (Bà ấy là một nông dân.)

2. A: What does your father do? (Bố bạn làm nghề gì?)

   B. He's a policeman. (Ông ấy là một cảnh sát.)

3. A: Is your mother an office worker? (Mẹ bạn có phải là một nhân viên văn phòng không?)

   B: Yes, she is. (Đúng vậy.)

4. A: What does your father do? (Bố bạn làm nghề gì?)

   B: He's a farmer. (Ông ấy là một nông dân.)

Lời giải chi tiết:

1. ✕    

2. ✓   

3. ✓      

4. ✕     

10 tháng 1 2024

a.

How old is your father, Mai? (Bố của Mai bao nhiêu tuổi rồi?)

He’s forty. (Ông ấy 40 tuổi.)

b.

What does he look like? (Ông ấy trông như thế nào?)

He has a round face. (Ông ấy có khuôn mặt tròn.)