1.Choose and write negative sentences.

do            eat            ride               wear             read             sleep               swim

1. The boys ...doesn't eat ...their lunch.They aren't hungry.
2.You ...don't do..your homework! You're hungry.
3. She ...doesn't listen ...to music. She's writing an e-mail.
4. He ...doesn't ride ...his bike.He's skating.
5. The cat ...doesn't sleep.... It's playing in the garden.
6. I ...don't read ...your magazine. This is my magazine.
7. They ...don't swim... in the sea. It's very cold.
 

1.Choose and write negative sentences.

do            eat            ride               wear             read             sleep               swim

1.Brian.....isn't wearing......his glasses today.

1.The boys.......aren't eating.....................their lunch. They aren't hungry.

3.You...............aren't doing.....................your homeworld! You're watching Tv!

4.She.........isn't listening................to music.She's writing an e-mail.

5.He...............isn't ride................his bike. He's skating

6.The cat............isn't sleeping..................... .It's playing in the garden.

7.I............amnot reading........................your magazine. This is my magazine.

8. They...........aren't swimming...................in the sea. It's very cold.

e ơi cái này thì HTĐ hay HTTD hay gì thế, cho chj xin đề bài ạ

1.Look read and write

1.the girl / take / a / photo? ....Is the girl taking a photo?....                ...Yes, she is...........

2.the dogs / jump? .....Are the dogs jumping ? ..........                     ....Yes , they are .............................

3.Brian / eat / red shoes?...Is Brian eating red shoes ?....( hơi kì á )..           ........No , he isn't...............

4.Zoe / laugh?.......Is Zoe laughing ?....................                       .............Yes , she is.......................

5.the clowns / wear / red shoes?.Are the clowns wearing red shoes ?..             .Yes , they are .........................

6.the baby / look at the clowns?...Is the baby looking at the clowns ?      ........Yes , he is...( baby phụ thuộc vào g.tính  )........  

7.the mice / sleep?.......Is the mice sleeping ?........                                 .......No , it isn't 

8.the cat / run?............Is the cat running ?.................                   ...................No , it isn 't .........

1.Are we studying English?                          ............Yes, we are.................

2.Are you wearing a T-shirt?                        ................No we aren't...............................

3.Are your friends playing basketball?         ....................................No we aren't............

4.Are we looking at our books?                  ...................Yes ,we are............................

5.Are your mum and dad working?             .....................Yes,they are..........................

6.Are you listening to your teacher?            .....................No,I am not..........................

1.What's happening now? Write true answers.

1.Are we studying English?                          ............Yes, we are studing.................

2.Are you wearing a T-shirt?                        ...................No , I amnot wearing............................

3.Are your friends playing basketball?         .....................Yes , they're playing...........................

4.Are we looking at our books?                  ...................Yes , we are looking............................

5.Are your mum and dad working?             ....................No , they aren't working..........................

6.Are you listening to your teacher?            ...................Yes , I am listening ...........................

* Bạn sd cấu trúc câu phủ định của thì hiện tại tiếp diễn 

2.We're doing our homework-Positive

We aren't playing our basketball-Negative

3.They're eating ice cream-Positive

They aren't drinking ice cream-Negative

4. You're talking to your friend-Positive

You aren't listening to me-Negative

5.You're flying-Positive

You aren't walking-Negative

Positive                                                                                      Negative

1.(read)                                                                                  1.(watch)

I....'m reading........a book.                                                       I....'m not watching.......Tv

2 (do)                                                                                     2.(play)

We.........are doing.................our homework.                                          We.........'re not playing.....................basketball

3.(eat)                                                                                    3.(drink)

They.........are eating.............ice cream.                                                   They........'re not drinking......................orange juice.

4.(talk)                                                                                     4.(listen)

You.........are talking..................to your friend.                                          You........'re not listening..............................to me.

5.(fly)                                                                                       5.(walk)

You......are flying..............................                                                      You.........'re not walking........................................

câu c sai quan hệ từ mà, thay bằng nên

a, Tôi rất yêu mẹ tôi vì mẹ là người đã chăm sóc tôi từ thuở lọt lòng.

b,Bài văn đã thể hiện lòng yêu nước sâu sắc của tác giả.

c,Lão cố tỏ ra vui vẻ nhưng thực ra lão rất nhớ thương chú chó vàng của lão. Vì lão ốm nên mới phải bán chú đi.

d,Các chiến sĩ đã hi sinh anh liệt để bảo vệ đất nước.

còn lại mình không nghĩ ra

Ta có:

|----------|----------|----------|

5         6        7         8

       \(A=\left\{x\in N|4< x< 9\right\}\)

Chết cha,xin lỗi vì lỗi hệ thống gây ra việc lệch tia số.Mong bạn thông cảm.

Ta thấy:

\(\frac{1}{101}+\frac{1}{102}+\frac{1}{103}+......+\frac{1}{200}>\frac{1}{200}+\frac{1}{200}+\frac{1}{200}+......+\frac{1}{200}\)

(Có 100 số hạng \(\frac{1}{200}\))

\(=\frac{1\cdot100}{200}=\frac{100}{200}=\frac{1}{2}\)

Lại có: 

\(\frac{1}{101}+\frac{1}{102}+\frac{1}{103}+......+\frac{1}{200}< \frac{1}{100}+\frac{1}{100}+\frac{1}{100}+......+\frac{1}{100}\)

(Có 100 số hạng \(\frac{1}{100}\))

\(=\frac{1\cdot100}{100}=\frac{100}{100}=1\)

Vậy tổng A lớn hơn \(\frac{1}{2}\)nhưng bé hơn \(1\).

a) A= 1/2² +1/3²+...+1/2005²

A= 1/2.2 + 1/3.3 +....+1/2005.2005

Vì 1/2.2 < 1/1.2 ; 1/3.3 < 1/6;.....; 1/2005.2005 < 1/2004.2005 nên A= 1/2² +1/3²+...+1/2005² < 1/1.2 + 1/2.3 +....+ 1/2004.2005

=> A < B

Vậy...

a) \(A=\frac{1}{2^2}+\frac{1}{3^2}+...+\frac{1}{2005^2}\)

Ta có : \(\frac{1}{2^2}=\frac{1}{2\cdot2}< \frac{1}{1\cdot2}\)

\(\frac{1}{3^2}=\frac{1}{3\cdot3}< \frac{1}{2\cdot3}\)

...

\(\frac{1}{2005^2}=\frac{1}{2005\cdot2005}< \frac{1}{2004\cdot2005}\)

\(\Rightarrow A=\frac{1}{2^2}+\frac{1}{3^2}+...+\frac{1}{2005^2}< \frac{1}{1\cdot2}+\frac{1}{2\cdot3}+...+\frac{1}{2004\cdot2005}=B\)

\(\Rightarrow A< B\)

b) \(B=\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+...+\frac{1}{2004\cdot2005}=\frac{1}{1}-\frac{1}{2005}=\frac{2004}{2005}< 1\)

Theo câu a) => \(A< B< 1\)

=> A < 1 ( đpcm ) 

Ta có  \(A=\frac{1}{101}+\frac{1}{102}+...+\frac{1}{150}\)

\(>\frac{1}{150}+\frac{1}{150}+...+\frac{1}{150}\)(50 số hạng)

\(=50.\frac{1}{150}=\frac{1}{3}\)

=> \(A>\frac{1}{3}\)(1)

Lại có : \(A=\frac{1}{101}+\frac{1}{102}+...+\frac{1}{150}< \frac{1}{100}+\frac{1}{100}+...+\frac{1}{100}\)(50 Số hạng 1/100)

\(=50.\frac{1}{100}=\frac{1}{2}\)

=> \(A< \frac{1}{2}\)(2)

Từ (1) và (2) => \(\frac{1}{3}< A< \frac{1}{2}\)(đpcm)