1 healthily

2 important

3 treatment

4 disappear

5 safely 

6 beautiful

8 careful

9 toothache

10 slowly

11 tasty

12 emotional

13 healthy

1. healthily
2. important
3. treatments
4. disappear
5. safely
6. beautiful
8. careful
9. toothache
10. slowly
11. tasty
12. emotional
13. healthy

healthily

important 

treatments

disappear

safely

beautiful

careful

toothache

slowly

tasty

emotional

healthy

1 A

2 Sai đề

3 A

4 D

5 D

6 A

7 B

8 B

9 D

10 D

11 D

12 C

13 B

14 D

15 C

16 D

17 A

18 C

19 B

20 B

1. A

3. A

4. D

5. D

6. A

7. B

8. B

1 eat less candy

2 Exercise more

3 eat more vegetable

4 use less TV

5 sleep more

6 eat more fish

7 eat less fast food

8 Try talking less

9 drink more warm water

10 sunbathe less

a. \(0< a< 90^0\Rightarrow cosa>0\)

\(cosa=\sqrt{1-sin^2a}=\dfrac{5}{13}\)

\(sin2a=2sina.cosa=\dfrac{120}{169}\)

\(cos2a=2cos^2a-1=2.\left(\dfrac{5}{13}\right)^2-1=-\dfrac{119}{169}\)

b.

\(\dfrac{3\pi}{2}< a< 2\pi\Rightarrow sina< 0\) \(\Rightarrow sina=-\sqrt{1-cos^2a}=-\dfrac{\sqrt{15}}{8}\)

\(sin2a=2sina.cosa=-\dfrac{7\sqrt{15}}{32}\)

\(cos2a=2cos^2a-1=2\left(\dfrac{7}{8}\right)^2-1=\dfrac{17}{32}\)

c.

\(\dfrac{\pi}{2}< a< \pi\Rightarrow sina>0\)

\(\Rightarrow sina=\sqrt{1-cos^2a}=\dfrac{\sqrt{2}}{2}\)

\(sin2a=2sina.cosa=-1\)

\(cos2a=2cos^2a-1=0\)

d.

\(\pi< a< \dfrac{3\pi}{2}\Rightarrow cosa< 0\)

\(\Rightarrow cosa=-\sqrt{1-sin^2a}=-\dfrac{1}{2}\)

\(sin2a=2sina.cosa=\dfrac{\sqrt{3}}{2}\)

\(cos2a=2cos^2a-1=-\dfrac{1}{2}\)

bạn có thể đăng lại câu hỏi không ạ :))

1 more expensive than

2 faster than

3 more modern than

4 hotter than

5 more beautiful than

6 cheaper than

7 better than

8 more convenient than

V

1 the longest

2 the most interesting

3 the biggest

4 the best

5 the most beautiful

6 the coldest

7 the fastest

8 the most important

III

1 height

2 smallest

3 youngest

4 more quiet

5 best

6 take - is raining

7 colder

IX

1 careful

2 activity

3 ninth

4 physical 

5 better

6 interesting

7 employees

8 twentieth

9 teachers

10 once

III

1 height 

2 healthy

3 long

4 sickness

5 unpleasant

6 appointment

VII

1 biggest

2 warmer - hottest

3 best

4 longest

5 noisier

VIII

1 taller

2 better

3 more expensive

4 faster

5 heavier

6 thinner

7 slower

8 cleverere

9 older

10 cheaper

11 taller

12 easier

\(sin\left(\dfrac{\pi}{2}-x\right)+cot^2x=cosx+\dfrac{cos^2x}{sin^2x}=cosx+\dfrac{cos^2x}{1-cos^2x}=a+\dfrac{a^2}{1-a^2}\)

\(=\dfrac{-a^3+a^2+a}{1-a^2}\)

\(\Rightarrow\left\{{}\begin{matrix}m=-1\\n=1\\\end{matrix}\right.\) \(\Rightarrow P=-3\)