Part 6 : 

1. especially

2. with

3. goods 

4. perform

Part 7: 

1. T

2. F

3. F

4.T

1A 2B 3B 4C 5C 6B 7C 8D 9D 10A 11A 12A 13D 14D 15B

1, How many languages can you speak?

2,How does she go to school?\

3, When didn your mother visit HLB?

4, How often does your grandpa listen to the radio?

5, Who gave you a present on your birthday party?

1 What can you speak?

2 How does she go to school

3 When did your mother visit Ha Long Bay

4 How often does your grandfather listen to the radio?

5 Who gave you a present on your birthday party

1. How many languages can you speak?

2. How does she go to school?

3. When didn your mother visit Ha Long bay?

4. How often does your grandpa listen to the radio?

5. Who gave you a present on your birthday party?

Ta có: ΔABC cân tại A

mà AH là đường trung tuyến

nên AH vừa là đường cao, vừa là đường phân giác

Xét \(\Delta ABC\) có: AB=AC \(\Rightarrow\)\(\Delta ABC\) cân tại A

\(\Rightarrow\)AH vừa là đường trung tuyến vừa là đường cao vừa là đường phân giác của \(\widehat{A}\) trong \(\Delta ABC\)

\(\Rightarrow AH\perp BC\)

a,Điện trở dây nối:

\(R=\rho\dfrac{l}{s}=1,7.10^{-8}\dfrac{60}{6.10^{-7}}=1,7\Omega\)

b,Đổi: 4 giờ = 14400 giây

Nhiệt lượng tỏa ra trong 10 ngày:

\(Q=Pt=176.\left(14400.10\right)=25344000W=25344kW\)

1.needn't

2.impressed

3.the

4.send

5.the

6.who

ko biết đúng ko nữa 

Part 1

1 needn't

2 impressed

3 with

4 send

5 the

6 who

Part 2

1f 2d 3c 4b 5a 6g

Part 3

1 was cooking

2 surfing

3 went

4 was going to visit

5 try

6 widened

7 cultural

8 conveniently

Part 4

1 serious -> seriously

2 well-preserved -> be well-preserved

Part 5

1 my english were good

2 going to the english-

3 area has been spoiled 

4 which I read 

Part 6 

1 without

2 be damaged

3 healthy

4 destruction

Part 7

2F 3F 4F