Tìm x:

\(\left(x+3\right)\left(x-3\right)-\left(x-5\right)^2=20\)

Thu gọn:
\(\text{ a/(x+2)^3-(x-2)^3}\)

b/\(x^3+15x^2+75x+125\)

c/\(x^3-12x^2+48x-64\)

Choose the best option that best completes each sentence:

1/Ba told me that he was living for the capital___________.
A.tommorrow
B.the following week

C.tonight

D.next Sunday

2.They asked me how many children_____________.
A.I had
B.had I
C.I have
D.have I

3.Thu said she had been_____________the day before.
A.here
B.there
C.in this palace
D.where

4.They told their parents that they _____ their best to do the test.
A.try
B.will try
C.are trying
D.would try

5.She____me whether I liked classical music or not.
A.ask
B.asks
C.asked
D.asking

6.He asked me who the editor of that book_____.
A.was
B.were
C.is
D.has been

7.He wants to know whether I___back tommorrow.
A.come
B.came
C.will come
D.would come

8.I wonder why he____love his family.
A.doesn't
B.don't
C.didn't
D.hasn't

9."I didn't witness that accident."
A.He denied not having witnessed that accident.
B.He denied having witnessed that accident.
C.He denied not having witnessing that accident.
D.He denied not had witnessed that accident.

10."Would you like to join our team?"he said.
A.He said to me would you like to join our team.
B.He told me if I would like to join their team.
C.He invited me to join our team.
D.He asked me if I would like to join our team.

11."You cheated in the exam."The teacher said to his students.
A.The teacher insisted his students on cheating in the exam.
B.The teacher prevented his students from cheating in the exam.
C.The teacher advised his students to cheat in the exam.
D.The teacher accused his students of cheating in the exam.

12."Don't touch that flower."the old lady said to the boy.
A.The old lady wanted the boy not to touching that flower.
B.The old lady insisted the boy on touching that flower.
C.The old lady warned the boy against touching that flower.
D.The old lady congratulated the boy on touching that flower.

13."Let's go on a walk holiday!"said Jane.
A.Jane suggested going a walking holiday.
B.Jane wanted us to go on a walking holiday.
C.Jane invited us to go on a walking holiday.
D.Jane allowed us to go on a walking holiday.

Rewrite the sentences with the words given.
1.The policeman ordered:"Stay where you are and don't touch anything.
____________________________________________________
2.The old lady said:"Will you please water these flowers for me"
____________________________________________________
3.All the ministers will see him off at the airport.

___________________________________________________

4.What are you talking about?(passive voice)
___________________________________________________
5.When did he buy that house?(passive voice)

___________________________________________________

6.She said:"Don't leave your coat on this chair,Nam"
___________________________________________________
7.She said to him:"Don't speak to me like that and behave yourself."
___________________________________________________

8.My teacher will ask us to do the test next Friday.
I wish_____________________________________________
9.They don't buy that house because they don't save enough money.
If_________________________________________________

10."My friend is coming net week"
Tom told me________________________________________
11."I will help my mum with housework the weekend"
Lan said____________________________________________
12."Iam going on holiday tomorrow"
The boy told his neighbor______________________________

13.My sister is old.she can drive a car.(enough)
My sister__________________________________________
14.The radio isn't small.You can't put it in your pocket.(not....enough)
__________________________________________________
15.This coat isn't warm.I don't wear it in winner.(not....enough)
___________________________________________________
16.She is the most beatiful and intelligent girl in her class.
No other member in__________________________________

17.If you didn't drive too fast,you wouldn't cause that accident.
Unless_____________________________________________
18.Unless I practise my English,I won't get any better.
If_________________________________________________
19.Sally doesn't know what she has to do for homework because she is absent from school.
If_________________________________________________

20."Where are you going for you holiday?"
Henry asked John_____________________________
21."When do you get back from HCM City?"
She asked him_______________________________________
22.He hasn't given me any money.
I__________________________________________________
No money__________________________________________

Living in the country is something that people from the city often dream about. However, in reality, it has both advantages and ___________.

There are certainly many advantages to living in the country. First of all, you can enjoy _______ and quiet. Morever, people are friendlier. Ther is less ______, so it is ______for young children.

However, there are some disadvantages to life outside the city . Firstly, because there are _____ people, you have few friends. In addition, entertainment is difficult to find, especially _______ the evening.

There are ________ shops and services, so it is hard to find _______. On the whole, the country is often the_______ place for those people who are retired or who have young children.

1.According to the passage,living in the country has ________
A.only good points
B.only bad points
C.both good and bad points
D.no disadvantages

2.How many advantages does living in the country have?
A.two
B.three
C.four
D.no

3.Living in the country is safer for children because___________
A.there is less traffic
B.there are few shops
C.there are fewer people
D.there are fewer services

4.Which of the following statements is NOT true according to the passenger?
A.People in the country tend to be friendlier than people in the city.
B.It's hard to find entertainment in the country.
C.There are fewer shops and services in the country.
D.The country is only suitable for retired people.

5.Having few friends is_______
A.one of drawbacks to life in the country
B.the only disadvantage to living in the country
C.one of certain drawbacks to life outside the city.
D.one of certainad vantages to life outside the city

Cho kim loại nhôm tác dụng với axit sunfuric tạo ra khí hiđro và hợp chất nhôm sunfat.
a/Lập PTHH của phản ứng
b/Cho biết tỉ lệ nguyên tử nhôm lần lượt với ba chất còn lại trong phản ứng

Lập PTHH của phản ứng sau:
Khí hiđro + oxit sắt từ \(\rightarrow\) Sắt + nước

Lập phương trình hoá học theo các phương trình chữ sau:
a/Đồng + khí oxi\(\rightarrow\)đồng\(\left(II\right)\)oxit

b/Kẽm + khí clo \(\rightarrow\)kẽm clorua

c/Canxi + axit clohiđric\(\rightarrow\)canxi clorua + khí hiđro

d/Sắt\(\left(III\right)oxit\) + khí hiđro\(\rightarrow\)Sắt + nước

e/Sắt\(\left(III\right)\) oxit + axit nitric\(\rightarrow\)Sắt\(\left(III\right)\)nitrat + nước

g/Khí axention\(\left(C_2H_2\right)\)+ Khí oxi\(\rightarrow\)khí cacbonic + nước

Hoàn thành các phương trình phản ứng sau:

a/\(Mg+?\rightarrow MgO\)

b/\(\text{Al}+H_2\text{S}O_4\rightarrow?+H_2\)

c/\(?+O_2\rightarrow P_2O_2\)

d/\(N\text{a}OH+?\rightarrow C\text{A}\left(OH\right)_2+N\text{a}NO_3\)