Phương trình hoành độ giao điểm:

\(-2x+m=2x^2 \\ \Leftrightarrow 2x^2+2x-m=0 (1)\)

d tiếp xúc P \(\Leftrightarrow (1) \) có nghiệm kép.

\(\Leftrightarrow \Delta'=0 \Leftrightarrow 1^2-2.(-m)=0 \Leftrightarrow m=\dfrac{-1}{2} \)

Vậy \(m=\dfrac{-1}{2}\)

- Các giá trị của cây ăn quả: giá trị dinh dưỡng, khả năng chữa một số bệnh, nguyên liệu cho các nhà máy chế biến, góp phần bảo vệ môi trường sinh thái.- Trong các giá trị đó, giá trị quan trọng nhất  là nguồn nguyên liệu cung cấp cho các nhà máy chế biến như bánh kẹo, đồ hộp, rượu,…

Các sản phẩm của cây ăn quả sau khi được chế biến sẽ mang lại hiệu quả kinh tế cao hơn khi chưa chế biến, góp phần phát triển kinh tế.

"chân trọng" :vvvvvvvvvvvvvv

1. Who will Liz send these letters to ?

2. What does she learn about in computer science class ?

3. What is your mother do at the moment ?

4. What does Lan like playing ?

5. How often do you go to the movies ?

6. Where do they go to on the summer holidays ?

When do they go to the beach?

7. Where do they stay ?

8. Who did he go on holiday with ?

9. Như 8.

10. What does she do ?

11. What is Lien's brother doing with the guitar now ?

12. Where will they fly to next month ?

When they will fly to Brazil ?

13. Which is your fav TV progaramme ?

- Mình làm ở dưới rồi đó ạ.

- Nói ngắn gọn là không chơi spam rồi sửa phải không ạ ?

1. Who will Liz send these letters to ?

2. What does she learn about in computer science class ?

3. What is your mother do at the moment ?

4. What does Lan like playing ?

5. How often do you go to the movies ?

6. Where do they go to on the summer holidays ?

When do they go to the beach?

7. Where do they stay ?

8. Who did he go on holiday with ?

9. Như 8.

10. What does she do ?

11. What is Lien's brother doing with the guitar now ?

12. Where will they fly to next month ?

When they will fly to Brazil ?

13. Which is your fav TV progaramme ?

1. Who lives in the city ?

Where are Mai and Hoa live ?

2. Who works in a factory ?

Where do Mr.Quang and Mr.Trung work ?

3. What does Mr. Tan do in a hospital ?Where does Mr. Tan work ?

4. How does he go to work ?

5. What do you do in the morning ?

When do you play soccer ?

6. How many pens do you have ?

7. How many factories near your house ?

Where are the two factories  ?

8. How old are you ?

9. How much time does it take you to do this exercise ?

10, How much time does it take Lan to walk to school ?

11. How many days does it take you to go to HCM city ?

12. How many people in Lan's faminly ?

13. When does your E class start ? 

\(S={2;\dfrac{5}{3}}\)

- Vâng cho mình sửa ạ.

1. Rachel stopped (dead in her tracks) when she saw me with Andy

A. stopped completely and suddenly       B. determined to see

C. exactly at the time arranged                D. gradually and slowly

2. Here's a photo of him at three months, (stark naked)

A. apparent and obvious             B. without decoration

C. well-dressed                            D. in the raw

3. If you want to be a successful gardener, of course you've got (to have green fingers)

A. making plants grow                B. get the job done

C. lack skills in gardening           D. a careful farmer

4. Turner's resignation came (out of the blue) after his team;s shock 5-0 defeat at Portsmouth

A. unexpectedly      B. deliberately       C. innocently        D. unsurprisingly