$A=\frac{{2005}^{2005}+1}{{2005}^{2006}+1}<\frac{{2005}^{2005}+1+2004}{{2005}^{2006}+1+2004}=\frac{2005.({2005}^{2004}+1)}{2005.({2005}^{2005}+1)}==\frac{{2005}^{2004}+1}{{2005}^{2005}+1}=B.$

Vậy A < B

$A=\frac{{2005}^{2005}+1}{{2005}^{2006}+1}<\frac{{2005}^{2005}+1+2004}{{2005}^{2006}+1+2004}=\frac{2005.({2005}^{2004}+1)}{2005.({2005}^{2005}+1)}==\frac{{2005}^{2004}+1}{{2005}^{2005}+1}=B.$

Vậy A < B

VII. Finish each sentence so that it means the same as the sentence before it (1,5 pts)

1. She is interested in watching television

-> She likes………watching television…………………………………………………………

2. The Nile is the longest river in the world

-> No river…………in the world is longer than the Nile………………………………………………………

3. Your friends are making a lot of noise

-> Please, stop……making a lot of noise………………………………………………………..

4. Minh plays football very well

-> Minh is very good………at playing football………………………………………………

5. We do a lot of out door activities in summer

-> We take part in ………a lot of outdoor activities in summer……………………………………………

cái này phải áp dụng cấu trúc cơ☹

II. Choose the best word or phrase (A, B, C or D) (2pts)

1. ………….the spring, I love all the flowers

            A. I like                      B. I’d like                   C. I need                     D. I’d want

2. There are ……………..girls in his class

            A. not                         B. no                           C. none                       D. any

3. ………..she plays the piano!

            A. How beautiful      B. How beautifully   C. What good                        D. What well

4. “What are the people there …………..?” “They are very friendly”

            A. love                                   B. liking                     C. like                         D. look

5. Hanoi is …………….exciting than Viet Tri City

            A. much                     B. much more                        C. more much                        D. only more

6. The meeting is very important, so you ………….be late

            A. must                       B. mustn’t                  C. should                   D. shouldn’t

7. You can have the meaning of a new word by looking it ……………in a dictionary

            A. in                            B. up                           C. on                           D. at

8. I first ………… Ho Chi Minh City in 2013

A. go               B. went                       C. visited                   D. been to

9. What are you going to do …….. Sunday morning?

A. in                B. on              C. on the                    D.in the

10. ………. eat too much salt. Is’t not good for you

A. Don’t                     B. Do                          C. Please                    D. Can’t

a,d,b

Chất hữu cơ có 2 nguyên tố hóa học đốt cháy sinh ra CO2 và H2O

Vậy chất hữu cơ đó có CTPT là: CxHy (x, ý là số tự nhiên)

Vì 12x + y = 40 

Mà: 40 = 12x + y ≤ 12x + 2x + 2 = 14x + 2

Nên x ≥ \(\dfrac{38}{14}\approx2,7\)

Mặt khác:

Mà: 40 = 12x + y ≥ 12x + 2x - 6 = 14x -6

Nên x ≤ \(\dfrac{46}{14}\approx3,29\) 

Vậy x = 3 và y = 4

CCDD

1c 2c 3d4a

Gọi số trứng bán được trong 3 ngày là x 

Ngày đầu bán được: \(\dfrac{1}{3}x+3\)

Ngày thứ hai bán được: \(\dfrac{1}{3}x+4\)

Ngày thứ ba bán được: \(\dfrac{2}{3}.\left(\dfrac{1}{3}x+3\right)\)\(=\dfrac{2}{9}x+2\)

Vậy tổng 3 ngày bán được: \(\dfrac{1}{3}x+3+\dfrac{1}{3}x+4+\dfrac{2}{9}x+2=x\)

\(\dfrac{8}{9}x+9=x\)

\(9=\dfrac{1}{9}x\)

\(x=81\) quả 

Vậy tổng số trứng bán được là 81 quả 

Ngày đầu bán được là: \(\dfrac{1}{3}.81+3=30\) quả

Ngày thứ hai bán được là: \(\dfrac{1}{3}.81+4=31\) quả 

Ngày thứ ba bán được là: \(\dfrac{2}{3}.30=20\) quả

20 quả