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\(B=\dfrac{6n+5}{2n-1}=\dfrac{3\left(2n-1\right)+8}{2n-1}=3+\dfrac{8}{2n-1}\)

Để B là số nguyên thì \(2n-1\in U\left(8\right)\)

Ta có bảng sau:

Vì n là số nguyên nên \(n\in\left\{0;1\right\}\)

Thay n = 0 vào B

\(\Rightarrow B=\dfrac{6.0+5}{2.0-1}=-5\)

Thay n = 1 vào B

\(B=\dfrac{6.1+5}{2.1-1}=11\)

a) \(\left|x+\dfrac{19}{5}\right|+\left|y+\dfrac{2017}{2018}\right|+\left|z-2019\right|=0\)

Ta có: \(\left|x+\dfrac{19}{5}\right|\ge0;\left|y+\dfrac{2017}{2018}\right|\ge0;\left|z-2019\right|\ge0\)

Để \(\left|x+\dfrac{19}{5}\right|+\left|y+\dfrac{2017}{2018}\right|+\left|z-2019\right|=0\) thì:

\(\left\{{}\begin{matrix}\left|x+\dfrac{19}{5}\right|=0\\\left|y+\dfrac{2017}{2018}\right|=0\\\left|z-2019\right|=0\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{-19}{5}\\y=\dfrac{-2017}{2018}\\z=2019\end{matrix}\right.\)

Vậy............................

b) Ta có: \(\left|x-\dfrac{9}{5}\right|\ge0;\left|y+\dfrac{3}{4}\right|\ge0;\left|z+\dfrac{7}{2}\right|\ge0\)

Mà \(\left|x-\dfrac{9}{5}\right|+\left|y+\dfrac{3}{4}\right|+\left|z+\dfrac{7}{2}\right|\le0\) thì:

\(\left|x-\dfrac{9}{5}\right|=\left|y+\dfrac{3}{4}\right|=\left|z+\dfrac{7}{2}\right|=0\)

\(\Rightarrow\left\{{}\begin{matrix}x=\dfrac{9}{5}\\y=\dfrac{-3}{4}\\z=\dfrac{-7}{2}\end{matrix}\right.\)

Vậy............................

I. Choose the best options to complete the statements

1. ................................ your teacher ? - Yes , she í very beautiful

A.DO YOU LIKE b. Do you want c. Would you like d. How do you like

2. How .......................... kilos of beef does she want ?

a. many b. much c. often d. about

3. I need some tea . Please give me a ...................... of tea

a. bottle b. bar c. tube d. packet

4. His father is waiting ........................... a bus

a. to b. of c. for d. at

5. Is there any .................................. in the bottle ? - Yes , there is some

a. peas b. carrots c. sugar d. beans

6. Does your brother ............................. any games ? - No , he doesn't

a. play b. plays c. playing d. to play

7. I don't like vegetables but my sister ........................................

a. do b. likes c. does d. would like

8. Would you like some apples , Lan ? - No , ................................... I'm full . Thanks !

a. I wouldn't b. I don't c. I'm not d. I don't like

9. How do they want .................................... to work ? - By minibus

a. to go b. to travel c. to walk d. Both a and b

10. ........................................... tonight ? - Nothing

a. What are you doing b. What do you do c. What are you going to do d. Both a and b

11. My grandparents are old , they don't like ...................................... because it's very cold

a. summer b. fall c. spring d. winter

12. He usually goes swimming once ..............................................

a. the week b. a week c. all weeks d. in the week

13. The room of my parents is small . "The room of my parents" means :

a. my room 's parents b. my parents's room c. my parents' room d. my room' parent

14. How ..................................... oranges would you like ? - Six , please . And ................................ tea

a. much / some b. many / any c. much / any d. many / some

15. Does Mary like ............................. ? - Yes , she goes jogging every morning

a. jog b. to jog c. jogs d. jogging

16. The children are playing .................................................... the garden

a. in b. on c. under d. at

17. They often eat ...................................................... ice - cream after dinner

a. some b. any c. a d. an

18. We go there by car and they go .................................. foot

a. on b. by c. to d. with

19. How much is a bowl of noodles ? - ................................... five thousand five hundred dong

a. They are b. It is c. It has d. There is

20. He is ......................................... English at a big school

a. teach b. teaches c. teacher d. teaching

21. I 'd like some meat , please . How much ............................................. ?

a. Do you like b. Do you want c. You'd like d. You need

22. They are going to stay ............................. their grandparents in the country

a. in b. to c. at d. with

23. Listen ! ......................................... to your sister ?

a. Who is going to talk b. Who talks c. Who does talk

d. Who is talking

24. .............................................. are you going to stay with ? - My sister and my brother

a. Who b. Where c. How d. How long

25. Which cinema ....................................................

a. do you want to go to b. do you want to go it c. you want to go d. do you want to go

I

1.Yesterday when we(visit) visited Long,he(clean) cleaned the floor

2.My father gave up(smoke) smoking ten months ago

3.Please don't make so much noise .I (study) am studying

4.My sister (work) has worked for Samsung cooperation since 2014

II

1.What about (go) going to the countryside this weekend?

2.If we pollute the water,we (not have) won't have fresh water to use

3.Who did you (talk)talk to when I came to meet you yesterday

4.She didn't have enough time(visit) to visit all the intersting places

Nói chung để sửa được cái này thì đều phải từ người copy. Khi copy chán rồi thì tự bản thân sẽ nhận ra cái mình cần là gì, với t thì là danh dự, ko phải suốt ngày mang danh là đứa copy. Khi đã copy chán và nhìn mấy đứa tự làm t thấy nhục lắm, con số GP với t rất quý giá và nó sẽ đẹp hơn khi t ko copy. Ngày trước mình nhìn 60GP của mình ko copy thôi cũng thấy đẹp vô cùng, rồi tự nhiên mình copy thành 100GP thấy nó cứ nhục kiểu gì ý. Mà với t thì t thấy tự làm thì dễ được GP hơn copy. T tự làm 4 câu thì 2 câu được GP. Đợt trước copy 20 câu, 5 câu được =.=

P/s: Lời tự sự của một đứa đã từng copy