Gi ải phương trình

a) \(\sqrt{4x-20}+\sqrt{x-5}-\dfrac{1}{3}\sqrt{9x-45}=4\)              b) \(\sqrt{2x-1}-\sqrt{8x-4}+5=0\)

c) \(\sqrt{x^2-10x+25}=2\)                                           d) \(\sqrt{x^2-14x+49}-5=0\)

Khử căn ở mẫu

a) \(\dfrac{a-\sqrt{a}}{1-\sqrt{a}}\)             b) \(\dfrac{2+\sqrt{3}}{2-\sqrt{7}}\)        c) 3xy \(\sqrt{\dfrac{2}{xy}}\)(xy >0)          d)  \(\dfrac{3}{\sqrt[3]{2}+\sqrt[3]{3}}\)

e) \(\dfrac{4}{\sqrt{3}+1}-\dfrac{5}{\sqrt{3}-2}+\dfrac{6}{\sqrt{3}-3}\)                 f) \(\dfrac{1}{1+\sqrt{5}}+\dfrac{1}{\sqrt{5}+\sqrt{9}}+\dfrac{1}{\sqrt{9}+\sqrt{13}}\)

Turn into Passive forms

My cousin will meet you at the station

He can't repair my bike

We can slove the problem

They used to (go)......swimming when they were young.

I (not, used to)......go barefooted when i was a child.

(You, used to)......wear Ao Dai when you went to high school?

Questions 1-4

Complete the summary using the list of words below.

adult              spatial          academic

practical        inquisitive    plentiful

verbal            uncertain     unfamiliar

Researchers investigating the development of intelligence have shown that (1) Answer skills become more significant with age. One good predictor of (2) Answer intelligence is the degree to which small children are (3) Answer about their surroundings and how much interest they show on finding themselves in an (4) Answer setting.

Becoming a tour guide

Many people dream of travelling for a living, but what does it actually involve?

Tour guides accompany visitors on tours, providing special information on places of interest, and managing the schedule for the tour.

Complete the sentences below.

Choose NO MORE THAN TWO WORDS from the passage for each answer.

1. Answer aren't necessary to become a tour guide but they can help.

2. If you have worked in Answer, it may help your chances of employment as a tour guide.

3. Tour guides must be prepared to work despite a lack of Answer.

4. An understanding of different Answer will help a tour guide manage groups of people.

5. Dealing with difficult Answer is part of working as a tour guide.

6. Being a tour guide may lead to a position in Answer or in putting together new tours for customers.

The children enjoy _________ their boats on the pond in the park.

A. floating 
B. melting 
C. growing 
D. risingQuestion 2: Many people are worried about the future of Antarctica because the ice is ________.A. typical 
B. melting 
C. natural 
D. nervous Question 3: My new apartment is quite close to my work. Now I can walk to work _______ going by car.A. together 
B. perhaps 
C. definitely 
D. instead of

Question 4: We get some days in the summer that are really too hot, but the ________ temperature is quite pleasant. 

A. usual 
B. average 
C. available 
D. special 

Question 5: The earthquake ________ widespread damage to property.

A. destroyed 
B. solved 
C. caused 
D. predicted 

Question 6: Every item we sell is made out of recycled _________.

A. material 
B. pattern 
C. solution 
D. program 

Question 7: The world has to ________ trash to solve the problem of pollution. 

A. support 
B. deal with 
C. create 
D. receive 

Question 8: He ________ an award for bravery from the police.

A. existed 
B. caused 
C. created 
D. received

Question 9: Our skin must be protected carefully in the ________ of the summer. 

A. average 
B. grow 
C. heat 
D. pattern 

Question 10: More trees have been ________ to create more oxygen for the whole city. 

A. reduced 
B. grown 
C. heated 
D. cleaned up 

Question 11: We were just not ________ of the increase of garbage, that we ever would need to recycle. 

A. proud 
B. anxious 
C. caring 
D. aware 

Question 12: The best ________ to reduce trash is raising people's awareness of environmental pollution and its negative effects on human's life. 

A. location 
B. solution 
C. invention 
D. nutrition 

Question 13: We have no way of predicting next year's weather _______. 
A. materials 
B. patterns 
C. organizations 
D. solutions 

Question 14: The forecast said the temperature was going to fall quickly, but today is only ________ colder than  yesterday. 

A. slightly 
B. definitely 
C. suddenly 
D. absolutely

Question 15: We haven't been able to find a ________ to the problem yet. 

A. image 
B. report 
C. solution 
D. awareness 

Exercise 3:  Fill in the blanks

1. The Answer amount of rainfall in California is less than in Washington.

2. Houses along the Answer are sometimes destroyed in storms.

3. The weather Answer is changing. It's different from 100 years ago.

4. The snow in the mountains won't Answer  if temperatures stay cold.

5. I want to relax today, but I'm going to work Answer.

6. Oranges Answer  in warm, sunny places.

7. When temperatures Answer, people often go outdoors.

8. I'm Answer  cold. Could you shut the window?