`C`

11. He drives as ________ his father does.
A. careful as                               B. more carefully

C. the most careful                     D. carefully as

12. I’ll be there ________ I can.
A. sooner as            B. no sooner as              C. as soon as             D. soonest as

13. Of the two sisters, Linda is ________.
A. Beautiful         B. more beautiful         C. the most beautiful         D. so beautiful as

14.________ I get to know her, the more I like her.
A. For more                      B. More              C. The more                 D. The most

15. In stead of slowing down, he drove ________.
A. more fastly                    B. faster                 C. more faster                    D. faster more

16. Hotels have developed ________ restaurants.
A. as rapidly as                        B. so rapidly that

C. as rapid as                          D. as rapid than

17. Commercial centres are ________ they were many years ago.
A. as popular than                 B. more popular than

C. the most popular              D. most popular than

18. What’s the ________ film you have ever seen?
A. Good               B. better               C. best              D. the better

19. The ________ accident in the history of the city happened last night.
A. Badest                           B. most bad                C. worse          D. worst

20. He finished the test ________ of all.
A. Rapidly                            B. more rapidly                   C. the most rapidly          D. rapid

`7/10 xx (5+3+2) = 7/10 xx 10 = 7`.

A

1. Ha is more hard working than Quang.

2. A village is quieter than a city.

3. Can you tell me something about your neighbourhood?

Bớt đăng xàm thì cũng bớt trả lời xàm. Nút báo cáo làm trò hề hả?

Ta có: `1 < 1 + 1/2^2 + ... + 1/n^2`

`1/(2.2) < 1/(1.2)`

`1/(3.3) < 1/(2.3)`

`...`

`1/(n^2) < 1/(n-1(n))`

`=> 1/2^2 + ... + 1/n^2 < 1/(1.2) + ... + 1/(n-1(n)) = 1/1 - 1/n < 1`.

`=> a < 1 + 1 = 2`.

`=> 1 < a < 2`.

`=>` Đây không là số tự nhiên.

`b``e``f``o``r``e`

`= x(y+2) + y+2 = 3`.

`=> (x+1)(y+2) = 3`

`=> x + 1 in Ư(3)`

`=> x + 1 = 1 => x = 0`

     `y + 2 = 3 => y = 1`.

`=> x +1  = -1 => x = -2`

      `y + 2 = -3 => y = -5`

`=> x + 1 = 3 => x = 2`

     `y + 2 = 1 => y = -1`

`=> x + 1 = -3 => x = -4`

   `y + 2 = -1 => y = -3`.