bài toán cổ 

8.5 mũ 2 -189 chia 3 mũ 2

cho tam giac abc vuông ở A ( AB<AC) , BD là tia phân giác của góc ABD ( D € AC)  , Từ D kẻ DE vuông góc với BC (E € BC)

a) chứng minh : tam giác abc = tam giac ebd

b) chứng minh : ab = be

cần gấp giúp mk vói nha

Exercise 3: Choose the correct answer A, B, C or D.

1. Do you like _____________ martial arts?

A.do                    B. doing             C. does               D. did

2. Tom likes _____________  coins all over the world.

A. going             B. collecting     C. doing             D. playing

3. My aunt is very _____________. She always feels tired and gets sick.

A. healthy         B. unhealthy    C. well                D. strong

4. What is the _______exciting movie you’ve ever seen?

A. most              B. more             C. less                 D. fewer

5. They _____________ for dinner at the moment.

A. was cooking              B. isn’t cooking              C. are cooking D. were cooking

6. –A: “I’m watching a soccer game at the stadium. Do you want to come?”

   –B:  “_____________.”

A. There’s no doubt about it.  C. Yes, congratulations!

B. Well done.                               D. Yes. Sure!

7. They are healthy. They do ___________ every day.

A. football        B. tennis            C. judo D. badminton

8. Find out the word with sound /iz/.

A. caps                B. watches            C. students         D. clocks

9. My family lives in a _____________ on Na Yeu village.

A. apartment   B. house            C. villa D. stilt house

10. _____________ two bathrooms in your house? – Yes, there are.

A. There is        B. There are     C. Is there         D. Are there 

11. We can’t go out because it _________ now.

A. am raining   B. is raining      C. are raining   D. rains 

12. Lam __________ lunch with his classmates right now.

A. have                 B. has                   C. is having        D. are having 

13. ________ is your house? – My house is in the country.

A. Who              B. What             C. When            D. Where

14. The dog is in _____________ the computer.

A. next to          B. between      C. behind          D. front of

15. School __________ at 11.15 every day.

A. finish             B. finishes         C. is finishing   D. are finishing

16. There _____________ a lamp, a computer, and some books on my desk.

A. be    B. am   C. is       D. are

a) x^3-3x^2+4x-2=0

b) x^3+3x^2+4x+2=0

c) 2x^3 + 3x^2-x-2=0

giải phương trình

-- Complete the second sentence so that it has a similar meaning to the first one --

1. I enjoy competitive sports, such as football and basketball

=> I'm interested ...

2. My brother is not so interested in basketball as I am

=> I ....