30 C

31 B

32 D

33 B

34 C

35 A

VII.

36. are

37. are studying

38. plays

39. is playing

40. stay

VIII.

41. sai đề k nhỉ? these shoes là số nhiều cơ mà, sao lại có does, it, costs đc?

42. C. hang -> hanging (be interested in N/ Ving)

43. B. bookshelf-> bookshelves

IX.

44. C

45. B

a) \(\dfrac{13}{15}< \dfrac{14}{15}\)  ( vì 13 < 14 )

b) Ta có:

\(\dfrac{2}{3}=\dfrac{2\times3}{3\times3}=\dfrac{6}{9}\)

Vì 6 = 6 nên \(\dfrac{6}{9}=\dfrac{6}{9}\)

Vậy \(\dfrac{2}{3}=\dfrac{6}{9}\)

c) Ta có:

\(\dfrac{4}{7}=\dfrac{4\times6}{7\times6}=\dfrac{24}{42}\)

\(\dfrac{5}{6}=\dfrac{5\times7}{6\times7}=\dfrac{35}{42}\)

Vì 24 < 35 nên \(\dfrac{24}{42}< \dfrac{35}{42}\)

Vậy \(\dfrac{4}{7}< \dfrac{5}{6}\)

d) Vì 9 < 13 nên \(\dfrac{4}{9}>\dfrac{4}{13}\) 

Vậy \(\dfrac{4}{9}>\dfrac{4}{13}\)

1)<
2)=
3)<
4)>

everybody

over a billion dolars

relieve the symtoms

no there isn't

VI

1 Everybody can get the common cold

2 A billion dollars is spent on cold medicine every year

3 This medicine can relieve the symptoms

4 No, It can't

5 No, there isn't

VII

1 What is your brother's height?

2 Because Lan was sick, she was absent from class yesterday

3 How heavy is the parcel?

4 Where do you live?

5  How much is you weight last year? 

6:

\(2^{225}=\left(2^3\right)^{75}=8^{75}\)

\(3^{150}=\left(3^2\right)^{75}=9^{75}\)

mà 8<9

nên \(2^{225}< 3^{150}\)

4: \(\left|5x+3\right|>=0\forall x\)

=>\(-\left|5x+3\right|< =0\forall x\)

=>\(-\left|5x+3\right|+5< =5\forall x\)

Dấu = xảy ra khi 5x+3=0

=>x=-3/5

1:

\(\left(2x+1\right)^4>=0\)

=>\(\left(2x+1\right)^4+2>=2\)

=>\(M=\dfrac{3}{\left(2x+1\right)^4+2}< =\dfrac{3}{2}\)

Dấu = xảy ra khi 2x+1=0

=>x=-1/2