\(=\frac{3}{2}\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+......+\frac{1}{99}-\frac{1}{100}\right).\)

\(=\frac{3}{2}.\left(\frac{1}{1}-\frac{1}{100}\right)=\frac{3}{2}.\frac{99}{100}=\frac{297}{200}\)

Cảm ơn bạn

1 A

2 C

3 B

4 C

5 D

6 A

8 B

8 D

9 C

10 B

Rewrite the sentences:

1. He allows me to go out at the weekend

→ He lets me go out at the weekend.

2. She is crazy about paiting ( like )

→  She likes painting a lot.

3. What about going to picnic next Sunday ?

→ Why don't we go for a picnic next Sunday ?

4. You shouldn't eat canned food.  

→  You ought not to eat canned food.

5. Going in the rain is exciting  

→ It's exhilarating to go in the rain.

6. It's interesting to go swimming in the summer  

→  Going swimming in the summer is interesting.

1. were

2. hadn’t lost

3. were

4. had heard

5. had found

6. were

7. were

8. had waited

9. had written

10. were

11. had joined

12. knew

13. were

14. were

15. hadn’t forgot

16. knew

17. lived

18. were meeting

19. were

20. had made

1)were

2)didn't lose

3)were

4)heard

5)found

6)were

7)were

8)waited

9)wrote

10)were

11)joined

12)knew

13)were

14)were

15)didn't forget

16)knew

17)lived

18)met

19)were

20)made

Bao giờ bạn nộp bài?

Chuẩn bị nộp r

BN THAM KHẢO:

Câu 1: Sau khi sưu tầm được nhiều ảnh đẹp về phong cảnh quê hương em, muốn gửi cho các bạn ở nơi xa, thì em có thể sử dụng dịch vụ thư điện tử (E-mail) trên Internet. Khi đó em phải đính kèm các tệp (các ảnh) để gửi cho bạn.

1.She wants to as lose weight so as she is on a diet.

2.He got up early this morning so as  he wouldn't be late for work.