I

1C

2 D

3A

4 B

II

5 D

6 A

7 D

8 B

9 C

10 A

11 B

12 B

13 B

14 D

I

1 A

2C

3 B

4 D

5 B

II

1 D

2 B

3 B

4 B

5 A

6 D

7 B

8 B

9 D

10 A

III

1 leaving => left

2 Do => would

3 visit => visiting

4 play => playing

3 careless

4 bleed

V

1 Hung has colllected stamps since 2000

2 The front yard isn't large enough to play soccer in

3 Milk is delivered twice a week by the milkman

4 When did you bought this computer?

5 His car doesn't run as fasst as a race car

6 Two languages can be spoken well by Lan

VI

1 T

2 F

3 T

4 T

VII

1 Mr. Nam is arriving in Hue tonight

2 They are going back to Englang in two months

3 It is not difficult to tránlate this sentence into English

4 Would you mind lending me your dictionary?

Bài này giải ở dưới r đó

1 C

2 B

3 D

4 D

5 C

6 B

7 D

8 A

9 C

10 C

Bài 3: Độ dài khoảng cách cần đặt chân thang cách chân tường là:

\(4\cdot cos66\) ≃1,6(m)

Bài 2: Chu vi tam giác ABC là:

\(AB+AC+BC=\sqrt{50}+\sqrt{32}+\sqrt{98}=5\sqrt2+4\sqrt2+7\sqrt2=16\sqrt2\) (cm)

Bài 1:

a: \(\sqrt{\left(2\sqrt5-5\right)^2}+\sqrt{24-8\sqrt5}\)

\(=5-2\sqrt5+\sqrt{20-2\cdot2\sqrt5\cdot2+4}\)

\(=5-2\sqrt5+\sqrt{\left(2\sqrt5-2\right)^2}=5-2\sqrt5+2\sqrt5-2\)

=5-2

=3

b: \(C=\left(\sqrt{10}-\sqrt2\right)\cdot\sqrt{3+\sqrt5}\)

\(=\left(\sqrt5-1\right)\cdot\sqrt{6+2\sqrt5}\)

\(=\left(\sqrt5-1\right)\left(\sqrt5+1\right)=5-1=4\)

c: \(D=\frac{2\sqrt3-3\sqrt2}{\sqrt3-\sqrt2}+3\cdot\sqrt{\frac23}\)

\(=\frac{-\sqrt6\left(\sqrt3-\sqrt2\right)}{\sqrt3-\sqrt2}+\sqrt6=-\sqrt6+\sqrt6=0\)