Mn giúp mk vs ạ, mk cần gấp

Tìm x

a,x²- \(2\sqrt{2}\) +2= 0

b,\(\sqrt{x^2-6x+9}\)= 5

c,\(\sqrt{x^2+4x+4}\)= x+2

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Choose the word or phrase among A, B,C or D that best fits the blank space in the following passage

TELEPATHY: MIND TO MIND COMMUNICATION

The (1) _________” telepathy” has been derived from the words “tele” meaning “ distance” and “pathy” meaning “feeling”. So telepathy actually means (2) _____________ feelings through a distance. Telepathy is the communication (3) _____________ two minds, (4) __________ over a distance, without the (5) ___________ of the five known senses.

      At some point of time or the other, we all have (6) __________ telepathy. Maybe you were thinking of someone you haven’t talked to for months and you suddenly get a call from them. Or (7) _________ two people are together, they might say the same thing at the same time. There are

spontaneous mind-to-mind (8) ________ that tend to occur frequently between closely related individuals.

1.A. word                        B. phrase                           C. letter                               D. signal

2.A. holding                     B. getting                           C. bringing                        D. carrying

3.A. through                     B. among                           C. between                        D. across

4.A. separate                    B. be separated                  C. separating                     D. separated

5.A. using                        B. use                                  C. take                                D. taking

6.A. experienced             B. brought                          C. made                             D. taken

7.A. where                        B. during                         C. when                              D. since

8.A. ways                        B. methods                          C. technique                       D. communications

Read the following passage about tornadoes and choose the best answer for each question.

Tornadoes

Did you ever see the movie The Wizard of Oz? A tornado sweeps up Dorothy and Toto, sending them to a new world where there are witches and talking lions! That entire story is fiction, but tornadoes are real and they are serious business. In fact, they can be the most dangerous storms of all.

Tornadoes are sometimes referred to as twisters or cyclones. They are shaped like a cylinder. They are born in thunderclouds. The winds inside a tornado swirl around and around and can be more than 300 miles per hour (mph). The winds are so strong that tornadoes can lift animals, cars, and even houses.

The United States has more tornadoes than any other country in the world. States such as Texas, Oklahoma, Kansas, and Nebraska are hit hard by tornadoes. This part of the country is known as 'Tornado Alley." Tornado season is during the springtime and summer. If the conditions  are right, a tornado can happen any time of year.

1. Where do tornadoes begin?

A. in the ocean                B. underground       C. in cyclones       D. in thunderclouds

2.    Why does the author mention The Wizard of Oz at the beginning of the passage?

A. to give a famous example of a tornado

B. to give a history of tornadoes

C. to show that hurricanes are not real

D. to explain why tornadoes are dangerous

2. Based on the passage, people who live in Tornado Alley should    .

A. expect tornadoes only during the summer.

B. be very familiar with the movie The Wizard of Oz.

C. be prepared for the dangers of tornadoes.

D. think about moving to the United States.

3. The word conditions in the last paragraph means______________ .

A. preparations                                 B. dangerous hazards

C.  the way things are                                D. lucky feelings

4. What is the main idea of this passage?

A. Some states get tornadoes more than other states.

B. Tornadoes are dangerous storms that affect the U.S.

C. Tornadoes are different from how they are in movies.

D. Many tornadoes do not cause a lot of damage.

Choose the correct word A, B, C for each gap to complete the following passage.

Rivers are (1)________ of the world's most important natural resources.

Many cities are on large rivers, and (2)______________every country has at least

one river that (3)__________________an important part in the lives of its people.

Beside transportation, river (4)________________to drink, and opportunities for recreation for people who live along their (5)____________     . And in order to get water for crops, engineers sometimes build

a dam across a river and let the water become a lake (6)____________the dam.

Then people can use their water not only to (7)________________fields but also to make electricity for homes and industries.

(8):________ , the water often becomes polluted when cities on river banks grow (9)________ size and the number of industries increases. We are learning that it is necessary to (10) ________    rivers clean if we want to enjoy the benefits of the natural resources.

EX: Use the given words to write the complete conditional sentences type 2.

1. If/I/ be/ you/I/ eat/ more vegetable.

__________________________________________________________________

2. More/ foreign tourist/ come/ here/ if/ environment/ clean.

__________________________________________________________________

3. What/ happen/ if/ there/ be/ no woman/ world?

__________________________________________________________________

4. If/I/ be/ his father/I/ ask/ him/ learn English/ better.

__________________________________________________________________

5. If/ there/ be/ no war/ earth/ people/ live/ peace/ forever.

__________________________________________________________________

6. Flood/ not happen/ so regularly/ if/ people/ not cut down/ so many/ tree.

__________________________________________________________________

7. If/ they/ tell/ their father/ he/ be/ very angry.

__________________________________________________________________

8. She/ spend/ a year/ USA/ if/ it/ be/ easy/ get/ green card.

__________________________________________________________________

9. If/I/ live/ lonely island/I/ be/ very sad all day.

__________________________________________________________________

10. My brother/ buy/ sport car/ if/ he/ have/ money.

__________________________________________________________________

cho m gam kim loại fe,mg,zn,ca,cu và al vào 1 bình kín có chứa 1 mol oxi.Nung nóng bình 1 thời gian cho đến khi ngừng phản ứng thì thể tích oxi giảm đi 3,5% và thu được 2,12 gam chất rắn.Tính m ( biết thể tích các khí đo ở cùng điều kiện về nhiệt độ và áp suất)

Đốt cháy hoàn toàn gam hỗn hợp X gồm CH4, C3H6, C4H10 cần dùng vừa đủ V lít không khí (gồm 20% thể tích O2 và 80% thể tích N2) thu được 26,4 gam CO2 và 13,5 gam H2O a) Viết PTHH b) Tính a và V