Cho tam giác ABC và đường trung tuyến AM, trên cạnh AB lấy điểm D và E sao cho AD=DE=EB. Gọi I là giao điểm của CD và AM. Chứng minh:AI=IM

Chứng minh rằng: 4x\(^2\)-4x+7\(>\)0 với mọi x

Chứng minh rằng: (a+b)\(^3\)-3ab(a+b)= a\(^3\)+b\(^3\)

 Write the correct forms of adjectives or adverbs in the brackets.

I. Ho Chi Minh City .................is than Da Nang. (interesting)

2. Lan is the .............student in my class. (good)

3. This exercise is ..............as that one. (difficult)

4. This elephant is .............than this tiger. (heavy)

5. ............you travel, ............you know. (much, much)

6. Biking along the river is ............activity of all. (exciting)

7. Giang drives ..............than her sister. (careful)

8. People in the countryside are ..........than those in the city. (friendly)

9. ......... the apartment is, ...........the rent is. (big, expensive)

10. Gina is ..........as Jenny. (slim).

11. She lives .......... from school than me. (far)

Make the questions for the underlined words.

1. She likes to visit the countryside at harvest time.

2. The wind was blowing very hard.

3. There are three apple trees in her garden.

4. Jack has been living in the countryside for 15 years.

5. My sister is good at swimming.