Cho tam giác ABC có AH là đường cao. Lấy I, E và K lần lượt là trung điểm cạnh AB, AC, BC. Biết BC= 6cm. Tính độ dài cạnh IE. Tứ giác IEKB là hình gì?Vì sao?
Ex2 . Rewrite the sentences .
1.Lan speaks English better than Hoa .
- Hoa............
2. He is a skillful tennis player .
-He plays ...............................
3. What a pity! You aren/t here with us now.
- I wish ..............................
4. The weather is very cold today.
- We wish............................
5.John smoked a lot a year ago, but now he doesn/t smoke any more.
-John used .......................................
6.How long is it since you saw Tom?
-When ....................................?
7. We started living here fifteen years ago.
- We have ..................?
8.. Minh began to collect stamps in 2000.
- Minh has...........................
9.They may organize a new race next month.
-A new race..................................
10. The postman must send this bag by airmail
-This bag.......................
11. People say that his father is French.
- It is said ..................................
12. I/ll have someone remove the fence.
- I/ll have the fence ........................................................
13. I need to repair my car.
- My car .................................
14The children are excited with the difficult games.
- The more ……………
15. My boss works better when he is pressed for time.
- The less ………………………