\(\left(\frac{1}{2+2\sqrt{x}}+\frac{1}{2-2\sqrt{x}}-\frac{x^2+1}{1-x^2}\right)\left(1+\frac{1}{x}\right)\)

\(=\left(\frac{2-2\sqrt{x}+2+2\sqrt{x}}{\left(2+2\sqrt{x}\right)\left(2-2\sqrt{x}\right)}-\frac{x^2+1}{1-x^2}\right)\left(1+\frac{1}{x}\right)\)

\(=\left(\frac{4}{4-4x}-\frac{x^2+1}{\left(1-x\right)\left(1+x\right)}\right)\left(1+\frac{1}{x}\right)\)

\(=\left(\frac{1+x-x^2-1}{\left(1-x\right)\left(1+x\right)}\right)\left(1+\frac{1}{x}\right)=\frac{x\left(1-x\right)}{\left(1-x\right)\left(1+x\right)}.\frac{x+1}{x}=1\)

borow        invite       phay        wear       buy      give     write        visit       see         have

 1) we_____our grandparents next weekend.

 2) she____a latter to her friend.

 3) I_____some books from the library.

 4) I_____some close friends to my birthday party.

 5) she_____a blue dress at her sister' s wedding.

 6) they______their holiday in Nha Trang.

 7) they______their children toys at christmas.

 8) we ______a phay at the ABC theater.

 9) he______chess in the youth club.

10) peter______some bread at the baker' s.

I .Chia động từ vào câu:

1. Who this knife (belong) _____?

- It (belong) ______ to John.

2. Please quiet , please ! The babies (sleep) ______ in their bedroom now , so don't ( laugh ) _____ !

3. Phuong ( not ẹnjoy ) ______ ( play ) _______ soccer and badmiton very much , She ( ẹnjoy ) ______ ( watch )____ cartoons.

II . Chọn từ thích hợp :

1. The Red River is ....... ( longer / very long / the longest ) in Viet Nam.

2. A paddy field is a rice ........ ( yard / paddy / park / garden ) .

3. Lemonade , apple juice , soda and ......( beans / noodles / vegetables / iced  tea ) are cold drink.

Complete sentences with ''too''or''either''

1. They often go to the library on Sunday afternoon. He...............................................

2. Lee can speak Japanese. I....................................

3. Nam didn't see the train. Nga........................................

4. Linh will fly to China next month, and he...................................

5. The books  aren't red. And the ruler............................

6. Today is hot,and yesterday......................................

7. The boys don't smoke cigarettes and the girls........................

8. I don't  know her and he....................

9. I like eggs and her brother..............................

10. I stayed at home last night, and they...................................

1 they (discuss)..........the question recently

2 hoa (never,be).............to ha noi

3 hien and huong(know).........each other for 5 years

4 tim (not take)...................many photos yet

5 they (begin).............to study at this school 7 years ago

6 she (lose)............her handbag on the train yesterday morning

7 we (visit)..............that city last years

8 his father (die)...............in 1930

9 lincoln (work)..............in the factory three years ago

10 I (do)...............my homework last night

11 Miss white (write).............to her father last Monday

12 My parents (buy)...................the car last year

13 peter and daisy(be)..............................born in 1978

please help me.......