22

\(\dfrac{-1}{8}\le\dfrac{x}{72}\le\dfrac{-1}{36}\)

\(\dfrac{-9}{72}\le\dfrac{x}{72}\le\dfrac{-2}{72}\)

\(\Rightarrow\) \(x\in\) {\(-9;-8;-7;-6;-5;-4;-3;-2\)}

a,x=4/5.0,5

x=4/5.1/2

x=2/5

b, thiếu

a) x: 0,5 = 4/5

x= 4/5 x 0,5

x= 2/5

b) đề bị thiếu

1You shouldn't spend a lot of time watching TV

2Antarctica is the coldest place in the world

4A car is not as convenient as a bicycle in towns

5Take a first right

1 B

2 D

3 B

4 A

5 D

6 B

7 C

8 B 

9 A

10 B

11 C

12 B

13 A 

14 B

15 A

16 B

17 A

18 D

19 D

20 C

21 A

22 D

23 C

24 D

25 C

26 D

27 A

28 C

29 D

30 D

31 B

32 A

33 C

34 C

35 B

36 D

37 B

38 A

39 A

40 A

Chào Lê Quang Nguyên nhé!

1. are => is

2. importance => important

3. the dinner => dinner

4. with => of

5. the most => the more

6. C           is

7. C          take

8. C           an 

9. A             When

10. A          well

11. B              going

12. B        to drink

13. A        who

14. B           whose

15. B           late

16. D            easily

17. C              have not

18. C             worse

19. C              were

20. B               was

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a: \(P=\dfrac{x^2-2x+2x+4-2x-4}{\left(x-2\right)\left(x+2\right)}\)

\(=\dfrac{x^2-2x}{\left(x-2\right)\left(x+2\right)}=\dfrac{x}{x+2}\)

1:

1: \(=3\sqrt{3}-12\sqrt{3}+10\sqrt{3}=\sqrt{3}\)

2: \(=6\sqrt{2}+10\sqrt{2}-35\sqrt{2}=-19\sqrt{2}\)

3: \(=4\sqrt{2a}+15\sqrt{2a}-5\sqrt{2a}=14\sqrt{2a}\)

4: \(=7\sqrt{a}-8\sqrt{a}+5\sqrt{a}=4\sqrt{a}\)

5: \(=\sqrt{a}\cdot\dfrac{\sqrt{2}}{2}-\sqrt{a}\cdot\dfrac{\sqrt{3}}{3}+3\sqrt{3}\cdot\sqrt{a}-2\sqrt{2}\cdot\sqrt{a}\)

\(=\sqrt{a}\cdot\left(-\dfrac{3}{2}\sqrt{2}+\dfrac{8\sqrt{3}}{3}\right)\)

1 D

2 B

3 A

4 A

5 D

6 A

7 B

8 C

9 A

10 D

11 D

12 D

13 A

14 A

15 D

16 C

17 C

18 D

19 A

20 A

21 D

23 A

23 B

24 A

25 C

26 A

27 C

28 B

29 A

30 D

31 B

39 D

33 C

34 A

35 A

36 A

37 B

38 D

1T

2F

3C

4A

1Unless Tom studied hard, he wouldn't get good marks

2Tam had a stomachache because he ate a lot last night