Thu nhập bình quân theo đầu người của Trung Quốc tăng khoảng bao nhiêu lần trong hon 20 năm qua?

A. 3 lần

B. 4 lần

C. 5 lần

D. 6 lần

Dat cau hoi cho cac cau tra loi sau:

1 What's her name?

-her name is Lan.

2 What's her family name?

-her family name is Nguyen.

3 What is her middle name?

- her middle name is Ngoc.

4. How old is she?

-she is thirteen years old.

5 Which grade is she in?

she is in grade 7.

6 Where does she live?

- she lives on Nguyen Trung Truc Street.

7. How far is it from her house to school.?

- It is about two kilometers from her house to school.

8 Why is she happy today?

- she is happy today because she has mayny new friends.

1. How long/ you/ learn English ?

=> How long have you learnt English?

2. Be/ you/ Italy ?

=> Have you in Italy?

3. Jane/ not phone/ me/ weeks.

=> Jane haven't phone me for weeks.

4. It/ rain/ since/ I/ get up/ this morning.

=> It has been rain since I got up this morning.

5. She/ be/ in hospital/ since/ Tuesday.
=> She has been in hospital since Tuesday.

Dien vao cho trong voi tu nghi van cho trong khung

............When......... does your father go to work? -At 7 o'clock.

.....Who................is your teacher talking to?

...............How......... far is it from here to the post office?

..................What....... does she do in the morning?

...................Where.............does your mother work?-at the hospital.

....................Why.............. is Lan unhappy ?- Because she misses her parents.

Viết câu phủ định và nghi vấn

1. Liz enjoyed her last summer vacation
PĐ: Liz didn't enjoy her last summer vacation.
NV: Did Liz enjoy her last summer vacation?

2. They will come there tomorrow
PĐ: They won't come there tomorrow.
NV: Will they come there tomorrow?

3. Hoa likes her new skirt
PĐ: Hoa don't like her new skirt.
NV: Does Hoa like her new skirt?

4. I wash my hands before meals
PĐ: I don't wash my hands before meals.
NV: Do you wash your hands before meals?

5. The people were friendly
PĐ: The people weren't friendly.
NV: Were the people friendly?

6. They are playing soccer today
PĐ: They aren't playing soccer today.
NV: Are they playing soccer today?

chia động từ

1.Oh, no! It (rain) ...is raining...... What a pity! We can't (go out) .....go out...... for a swim

2. What is Perter (do) ...doing...... on the floor?

- He (look) .....is looking.... for his eraser

3.What sports do you (do) ....like......?

- Well, I like (swim) ...swimming.......... very much

4. My sister always (wear) ......wears..... nice clothes for work

-Today she (wear) .....wears......... a blue jacket and skirt

5. Why do you (buy) .......buy..... so much food?

- Because we (have) .......are having.... a party tonight

I. Dùng từ và cụm từ gợi ý viết thành câu hoàn chỉnh.

1.I/not hungry/but/thirsty/like/glass/water.

-> I am not hungry but I am thirsty, I like glass of water.

2.What/you want me/buy/you?

-> What do you want me to buy for you?

3.look/they/drink tea/and/eat sandwiches over there.

-> Look! They are drinking tea and eating sandwiches over there.

4.My brother/heavy/strong.He/weight lifter .

-> My brother is heavy and strong. He is a weight lifter.

5.There/some mangoes/fridge.

-> There are some mangoes in the fridge.

a) \(A=2^{n-1}+2.2^{n+3}-8.2^{n-4}-16.2^n\)

\(=2^{n-1}+2^{n+3+1}-2^{n-4+3}-2^{n+4}\)

\(=2^{n-1}+2^{n+4}-2^{n-1}-2^{n+4}\)

\(=0\)

b) \(B=\left(3^{n+1}-2.2^n\right)\left(3^{n+1}+2.2^n\right)-3^{2n+2}+\left(8.2^{n-2}\right)^2\)

\(=\left(3^{n+1}-2^{n+1}\right)\left(3^{n+1}-2^{n+1}\right)-3^{2n+2}+2^{2n+2}\)

\(=3^{2n+2}-2^{2n+2}-3^{2n+2}+2^{2n+2}\)

\(=0\)

a) \(x\left(x+2\right)+y\left(y-2\right)-2xy+37\)

\(=x^2+2x+y^2-2y-2xy+37\)

\(=\left(x^2-2xy+y^2\right)+2x-2y+37\)

\(=\left(x-y\right)^2+2\left(x-y\right)+37\)

\(=7^2+2.7+34\)

\(=100\)

b) \(x^2\left(x+1\right)-y^2\left(y-1\right)+xy-3xy\left(x-y+1\right)-95\)

\(=x^3+x^2-y^3+y^2+xy-3xy-3xy\left(x-y\right)-95\)

\(=x^3+x^2-y^3+y^2-2xy-3xy\left(x-y\right)-95\)

\(=\left(x-y\right)^3+\left(x-y\right)^2-95\)

\(=7^3+7^2-95\)

\(=297\)