tìm x biết:

a)\(\sqrt{x-5}=3\)

b)\(\sqrt{x-10}=-2\)

c)\(\sqrt{2x-1}=\sqrt{5}\)

d)\(\sqrt{4-5x}=12\)

làm đến bước giá trị tuyệt đối thì làm 2 trường hợp nhá !!!

mk cảm ơn

We all know that too much animal fat is bad (18).................. our heath . For example , Americans eat a lot of meat and only a small (19) .................... of graint , fruit and vegetables . (20) ................. their diet , they have hight rates of cancer and heart disease. In Japan , people eat large amounts of grains and very (21)................ meat . The Japanese also have very low rates of cancer and heart disease and they live(22) .............. than anyone else in the world . When Japanese people move to the United States , the rates of heart disease and cancer increase when their (23)............... changes. So , we should eat more grains , fruit and vegetables and eat (24) ................ meat and fewer (25) ............... products.

18. a. to b. at c. of d. for

19. a. numbers b. amount c. kind d. product

20.a. Instead b. Instead of c. Because d. Because of

21. a. much b. many c. little d. few

22. a. longer b. shorter c. older d. worse

23.a. health b. diet c. energy d. products

24. a. much b. more c. less d. fewer

25. a. cereal b. healthy c. grain d. diary

\(\sqrt{x^2-4}+2\sqrt{x-2}\)

1. We shouldn't run or walk careless around the pool edge .

A B C D

2. It is difficult for us trying to stay away from water .

A B C D

3. They plan improving water safety awareness for children .

A B C D

4. Thanks for the diving vessel , he could explore the oceans of the world.

A B C D

5. Could you give me some advices about water safety .

A B C D

6. She invited her friends have dinner at her place last night .

A B C D

7. We need to talk for the plans for the weekends .

A B C D

8. She wants to know how teenagers in other countries like .

A B C D

9. Many neighbors spend much time together any more.

A B C D

10. You should take part on sports instead of watching it .

A B C D

1. I wish ................... to the teacher about that .

a. explain b. to explain c. explaining d. to explaining

2. ................. is a person who swims underwater using special equipment .

a. Diver b. Scientist c. Participant d. Cyclist

3. We are late , thanks to you.

a. because b. because of c. instead d. instead of

4. He said that he would wait ............. me .

a. for b. of c. to d. at

5. .............. is a person who rides a bicycle .

a. Scientist b. Cyclist c. Member d. Participant

6. I am well aware ............... the problem.

a. of b. for c. about d. on

1. She told me not ....................... late .

a. be b. to be c. being d. to being

2. She went out without ..................... anything .

a. say b. to say c. saying d. to saying

3. They waied................. him in his living room .

a. see b. to see c. seeing d. to seeing

4. The dentist asked him not to forget .............. his teeth.

a. brush b. to brush c. brushing d. to brushing

5. She sings ............ .

a. beautiful b. nice c. beautifully d. lovely

6. Everybody wished .............. this activity.

a. keep b. to keep c. keeping d. to keeping

7. He volunteered ............ us all in his car .

a. take b. to take c. taking d. to taking

8. We can learn more about the undersea world ............. this invention .

a.because b. for c. thanks to d. thanks for

9. The number of participants .............. every week.

a. increase b. increases c. is increase d. are increase