Cho hàm số y = (3m+1 ) x²  có đồ thị là (P) với m là tham số.

a) Tính giá trị của m để đồ thị (P) đi qua điểm E \(\left(\dfrac{1}{2};\dfrac{1}{4}\right)\)

b) Tính giá trị của m để đồ thị (P) đi qua điểm F ( x₀; y₀) với (x₀; y₀) là nghiệm của hệ phương trình \(\left\{{}\begin{matrix}3x-4y=2\\-4x+3y=-5\end{matrix}\right.\) . Vẽ đồ thị (P) thu được.

Cho hàm số y = (4m + 2) x²  với m ≠ -\(\dfrac{1}{2}\). Tìm các giá trị của tham số m để hàm số :

a) Nghịch biến với mọi x < 0

b) Đạt giá trị lớn nhất là 0

Ex : Complete the sentences by using the correct form of the words in brackets.

1. The aim of the conference is to promote international (friends)___________.

2. Donald is so ( create)_________in the kitchen. I think he should be a professional chef.

3. The keys were locked inside the car. (Luck)__________ , a side window was open.

4. They have agreed to ( wide) __________ the road because of the amount of heavy traffic now using it.

5. Hasn't anyone ever told you that it's very (polite)____________ to interrupt when other people are talking ?

6. I told the manger that it was the (bad)____________ hotel I had ever stayed in.

7. The headmaster is going to make a ( speak ) ______________in front of the teaching staff.

8. Experienced (travel)__________ wil enjoy our hotel 's comfortable double rooms.

9. That big dog is perfectly ( harm) _________. It has never been known to attack anyone.

10. " Well, Mrs Tuner, you'll be pleased to hear that Georgia has made a big (improve) __________in physics".

Ex: Read the text below and circle the option (A, B, C or D) that best fits each gap.

  I had never been to Denmark before, and when I set out to catch the ferry in early May , I little suspected that by the end of te trip I'd have made such lasting friendship.

  I wanted to (1)___________my time well, so I had planned a route which would (2)___________several small islands and various parts of the contryside. I arrived at Esbjerg, a (3)___________port for a cyclist 's arrival, where tourist information can be obtained and money changed. A cycle track leads out of town and down to Ribe, (4)___________I spent my first night.

  In my ( 5)_________, a person travelling alone sometimes meets with unexpected hospitality, and this trip was no exception. In Ribe, I got into conversation whith cheerful man who turned (6)_________to be the local baker. He insisted that I should (7)__________ his family for lunch and while we are eating, he contacted his daughter in Odense. Within minutes, he had (8)____________ for me to visit her and her family. Then I was sent on my way with a fresh (9)_________of bread to keep me (10)____________and the felling that this would turn out to be a wonderful holiday.

1. A. take

   B. serve

   C. exercise

   D. use

2. A. include

   B. to include

   C. including

   D. included

3. A. inconvenience

   B. inconvenient

   C. convenience

   D. Inconvenient

4. A. who

   B. which

  C. where

   D. that

5. A. experience

   B. experienced

   C. informative

   D. information

6. A. off

   B. out

   C. at

   D. on

7. A. greet

   B. see

   C. join

   D. approach

8. A. arranged

   B. fixed

   C. settled

   D. ordered

9. A. tube

   B. can

   C. loaf

   D. bar

10. A. gone

     B. to go

    C. go

     D. going

As an ecotourism site, it can (1) .............tourists with beautiful landscape in the biosphere reserve. Tourists can trace (2) ...............animals and watch them hunting their (3)................at night. Also, they can go (4).................along Dong Nai River to Bau Sau to view peacocks' s graceful dances. At present more and more visitors come to Nam Cat Tien National Park on their ecotour. Thanks to this , the economy in the local area is flourishing. This (5)..................local authorities more interested in developing this kind of tourism.

1. A. give

   B. provide

   C. bring

    D. take

2. A. mad

   B. wild

   C. dangerous

   D. small

3. A. preys

   B. victims

   C. birds

   D. insects

4.A. fishing

   B. shopping

   C. boating

   D. skiing

5.A. helps

   B. makes

   C.is

   D. wants

Một cano chạy xuôi một khúc sông dài 63km sau đó chạy ngược dòng 30km hết tất cả 5h . Một lần khác cano chạy xuôi dòng 42km và chạy ngược dòng 45km cũng mất 5h . Tìm vận tốc thực của cano và vận tốc dòng nước .

Hàng ngày, trên kênh VTV 1 của Đaì truyền hình Việt Nam , chuyên mục Việc tử tế thường giới thiệu tấm gương con người bình thường đã âm thầm làm ấm áp tình người , nóng lên tình đời trong cuộc sống. Hãy viết đoạn văn nêu suy nghĩ của em khi xem chuyên mục ấy.