tin hay không tùy bạn('v')-?

Trước hết ta thấy rằng nếu có một trong hai số x,y chẵn thì xy chẵn còn 2x+2y+1 là lẻ, do đó 2x+2y+1 không thể chia hết cho xy.

Ta có: un=u1.qn−15 số hạng tiếp theo là:u2=(−3).(−2)2−1=6u3=(−3).(−2)3−1=−12u4=(−3).(−2)4−1=24u5=(−3).(−2)5−1=−48u6=(−3).(−2)6−1=96

12. Ha Noi isn't so big as Ho Chi Minh

13. Lan is as beautiful as her sister

14. Mr.Ha is as fat as Mr .Tan/Mr .Ha is fatter than Mr.Tan

15. Nam is the tallest boy in his class

16. Hoi An is the oldest town in Vietnam

17. Miss Bennet is fatter than Tina/Miss Bennet is as fat as Tina

18. Tina is slimer than Miss Bennet/Tina is as slim as Miss Bennet

19. Miss Bennet is slimer than her brother/Miss Bennet is as slim as her brother

20. Her brother is as fat as Miss Bennet/Her brother is fatter than Miss Bennet

qUẢNG CÁO LIÊN QUAN ĐẾN TRẢI NGHIỆM HỌC TẬP 

1.C

2.D

3.D

4.B

5.C

6.B

7.D

8.C

9.D