Tìm GTNN của biểu thức A = 9x² – 12x + 2018

Bài 4 (1đ) :

a) Chú Tư muốn mua một cái máy giặt, thấy giá trên bảng thông báo là 4500000 đồng và khuyến mãi giảm 10% trên giá niêm yết . Hỏi nếu mua cái máy giặt thì chú phải trả bao nhiêu tiền?

IV. Read the following passage . Decide if the statements from 1 to 4 are True or False and choose the correct answers (A,B,C,D) for the questions 5 and 6 (1,5 pts)

I remember the days when I was a little girl . When the New Year came, my mother used to tell me not to cry, she used to take me to the market and buy new clothes for me . People sold lots of things there, such as vegetables, fruit, meat, and clothes . Everything was really cheap . My mother bought 500 grams of carrots and they only cost 10,000 VND . She also bought 2 kilos of pork and 500 grams of potatoes because we love cooking potato soup for dinner . Pork costs 60,000 VND per kilo, and potatoes are 18,000 VND per kilo . She used to go to the flower market to buy a bunch of beautiful flowers, too . It was fresh and only cost 30,000 VND . I had a nice morning in the market . My father used to paint the walls and redecorate the house and he used to help my mom with housework . Now my parents are old and I am grown up but I still remember the days

1. She doesn’t forget the day when she was a little girl

2. The market sold on vegetables, meat and clothes

3. Her father helped her mother with chores

4. 500 grams of potatoes are 18,000 VND

5. The girl in the passage ……..

A. is very busy    B. buys a lot of seafood    C. has good memories in the past

D. is not a good daughter

6. How much change does she get if she has 200,000 VND ?

A. 65,000 VND    B. 31,000 VND    C. 96,000 VND    D. 82,000 VND

II. Supply the correct form of the word in bracket (1,5 pts)

1. Where do they ………………………………………………………….…………….. and empty garbage ? (collection)

2. The dance …………………………………………………………………………….….………….. start at 9 p. m (compete)

3. Eating too much candy is ………………………………………………………………………………………………. (health)

4. Dan Nhi and Cong Chieng are traditional …………………………………………….………….……. instruments from Vietnam (music)

5. The …………………………………..…………………………………………………. will hold in Diamond Plaza (exhibit)

6. He ran …………………………….....………………………………..……… down the hall to greet her cousins (excite)

II. Supply the correct form of the word in bracket (1,5 pts)

1. Women couldn’t choose their husbands and had to get ………………………..……………………………… at a very young age (marry)

2. ……………………………………………………., ao dai is worn by both men and women at wedding (tradition)

3. My friend dances very …………………….……………..………………… , so she has won many awards (beauty)

4. She ………………………………………………………………………………. like a real actress last week (active)

5. Traditional instruments are played by many …………………………………….…….................. cultural groups around the world (differ)

6. I think the factories are causing air ………………………………………………………………..……………….. (pollute)

IV. Read the following passage . Decide if the statements from 1 to 4 are True or False and choose the correct answers (A,B,C,D) for the questions 5 and 6 (1,5 pts)

My family lives in New York City . There are many supermarkets here, but my mother likes buying food at Union Square Greenmarket . This famous farmer’s market began in 1976 to help local farmers and fishermen sell their products . Last Saturday, my mother took me to the market . People sold lots of things there, such as vegetables, fruit, meat and seafood . These products were so fresh and cheap . We bought 500 grams of peas and they only cost $2 . We also bought 2 kilos of pork and 500 grams of potatoes because we love cooking potato soup for dinner . Pork is $10 per kilo, and potatoes are $4 per kilo . My mother bought 250 grams of cheese, too . It was delicious and only cost $16 per kilo . I bought a bunch of beautiful flowers for my sister’s birthday, on Sunday, for only $8 . I had a nice morning in the market . It’s my favorite place now and I want to go there every weekend

1. Union Square Greenmarket is in New York City

2. The market close in 1976

3. The market sells only vegetables and fruit

4. Vegetables and fruit are fresh and cheap there

5. How much are 250 grams of cheese ?

A. $16 B. $8 C. $4 D. $10

6. What is the main idea of the passage ?

A. A day at Union Square Greenmarket B. New Yorker’s life

C. Helping the farmers D. At a supermarket

Bài 1:

i)\(\dfrac{x+1}{x-5}\)+\(\dfrac{x-18}{x-5}\)-\(\dfrac{x+2}{5-x}\)

j)\(\dfrac{3x\left(x-2\right)}{3x-2}\)+\(\dfrac{6x^2}{3x-2}\)-\(\dfrac{2\left(2-3x\right)}{2-3x}\)

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

Bài 2:

j)\(\dfrac{2}{3x}\)-\(\dfrac{1}{2x-2}\)-\(\dfrac{x-4}{6x-6x^2}\)

Bài 1: Một thùng đựng chứa đầy nước ép cao 1,2 m. Áp suất của nước tác dụng lên đáy thùng là bao nhiêu?
Biết trọng lượng riêng của nước ép là 10200 N/m3
Bài 2: Một bình hình trụ cao 0,9 m chứa đầy dầu
a) Tính áp suất của dầu lên đáy bình và ở điểm A cách đáy bình 30 cm.
b) Tính áp lực của dầu lên đáy bình. Biết diện tích đáy của bình là 120 cm2Biết trọng lượng riêng của dầu là 8100 N/m3

Bài 3: Một tàu ngầm đang di chuyển ở dưới biển. Áp kế đặt ngoài vỏ tàu chỉ áp suất 1,56.106 N/m2. Một lúc sau áp kế chỉ 1,82.106 N/m2
a) Tàu đã nổi lên hay lặn xuống? Vì sao khẳng định được như vậy?
b) Tính độ sâu của tàu ngầm ở hai thời điểm trên. Cho biết trọng lượng riêng của nước biển bằng 10400
N/m3

Bài 5 : Tính khối lượng của các hỗn hợp sau

d) Hỗn hợp Y gồm 3,36 lít SO2 và 13,44 lít CH4 ở đktc

Bài 6 : Tính thể tích của các hỗn hợp khí sau ở điều kiện tiêu chuẩn

a) 0,15 mol CO2, 0,2 mol NO2, 0,02 mol SO2 và 0,03 mol N2

a) \(\dfrac{4x}{x^2+2x}\)+\(\dfrac{8}{x^2+2x}\)       

b) \(\dfrac{2x-3x}{x-2}\)-\(\dfrac{2x-4}{x-2}\)                   

c) \(\dfrac{2x-1}{x+3}\)-\(\dfrac{3x+2}{x+3}\)

d) \(\dfrac{11x}{2x-3}\)-\(\dfrac{18-x}{2x-3}\)

e) \(\dfrac{3\left(x-2\right)}{2x+1}\)-\(\dfrac{9x-3}{2x+1}\)

Exercise 3 . Choose the word or phrase that best completes the sentences

11. ……………. pollution is the responsibility of both ordinary people and the authorities

A. Covering     B. Preventing     C. Providing     D. Minimizing

12. These fruits are sprayed with too many pesticides, they become ……..

A. eatable     B. edible     C. inedible     D. eaten

13. Don’t be so sad ……. you want to be on the trip

A. so     B. if     C. because     D. as

14. He didn’t know how to solve the problem, ….. he asked her for help

A. because     B. as    C. so     D. that

15. It’s …….. environmental problems must be solved by the authority first

A. important that     B. important for     C. very important when     D. too important if

16. They were amazed ………. your excellent performance, and then excited …… it

A. in/at     B. at/by     C. at/on     D. at/about

17. A :”What about collecting unused clothes for the homeless ?” – B :”……….”

A. Great ! Let’s do it    B. Thank you . We will

C. It’s very kind of you . We need them     D. That’s it . Unused clothes are still useful

18. A :”I suggest using public buses instead of motorbike” – B :”…………”

A. Yes, please     B. Good idea     C. We will    D. I’m afraid not

19. Everyone must take part in ………. deforestation

A. permitting     B. protecting     C. persuading     D. preventing

20. …….. is a piece of land full of rubbish

A. Junk-yard     B. Garbage     C. Hedge     D. Treasure