Đơn giản vcl 

Bài 7: Chiều rộng của nền căn phòng hình chữ nhật là:

 \(10\cdot\dfrac{1}{2}=5\left(m\right)\)

Diện tích nền căn phòng là:

S_nền = \(10\cdot50=500\left(m^2\right)\)

Diện tích 1 vien gạch là:

S_{viên gạch} = \(50\cdot50=2500\left(cm^2\right)\)

                               \(=0,25\left(m^2\right)\)

Số viên gạch cần để lát kín nền là:

\(\dfrac{S_{nền}}{S_{viêngạch}}=\dfrac{500}{0,25}=2000\) (viên)

Bài 8: a) Chu vi của H.1 là:

\(C=AB+AD+BC+CD=4+4+2+2=12\left(cm\right)\)

b) Độ dài cạnh BE là: 

\(\dfrac{135}{15}=9\left(m\right)\)

Vì \(BE=EG\Rightarrow BG=2BE=2\cdot9=18\left(m\right)\)

Độ dài cạnh AB là: 

\(\dfrac{180}{18}=10\left(m\right)\)

Chu vi HCN ABKG là: 

\(C_{ABKG}=\left(10+18\right)\cdot2=56\left(m\right)\)

Chi vi HCN BCED là: 

\(C_{BCED}=\left(15+9\right)\cdot2=48\left(m\right)\)

Chu vi H.2 là: 

\(C=C_{ABKG}+C_{BCED}=56+48=104\left(m\right)\)

Bài 7:

Diện tích mảnh vườn:

40 x 30 = 1200(m²)

Diện tích lối đi:

2 x 30 = 60(m²)

Diện tích mảnh vườn không tính lối đi:

1200 - 60 = 1140(m²)

Đ.số: 1140m²

III. 

A. 

1. B

2. C

3. B

4. A

5. D

B. 

1. C

2. B

3. B

4. A

5. C

1 b c b a d

2 c b b a c nha

Bạn cần bài nào ạ? Nếu bạn cần giúp tất cả thì bạn tách ra từng CH khác nhau nhé!

1 The meeting was canceled 3 days ago

2 She told me she was watching a film with her sister then

3 I admire the guitarist who is perfroming on the stage

4 Had it not been for Pauline's interest, the project would have been abandoned 

IV. 

1. The meeting was canceled 3 days ago.

2. She told me shewas watching a film with her sister then

3. I admire the guitarist who is performing on the stage

4. Had it not been for Pauline's interest, the project was abandoned. (chắc thế)

1. English is more interesting than music.

2. Today they are not as happy as they were yesterday.

3. Ha Noi is not as small as Hai Duong.

4. Mai's sister is not as pretty as her.

6. You have got more money than me.

7. Art is not as difficult as French.

8. Nam's father is more careful than him.

9. No one in our town is as rich as Mr Ron.

10. He is the most intelligent in my class.

11. Everest is the highest mountain in the world.

12. Minh is the fattest person in my group.

13. I can't swim as far as Jan.

14B 15C 16A 17C 18B 19C 20B

bạn có thể chụp thẳng đc hong?????

He asked me to know what the time was.

She asked me when we would meet again.

She asked him If he was crazy.

He asked me to know when they had lived.

He asked her If she would be at the party.

She asked me If I could meet her at the station.

The teacher asked me to know who knew the answer

She asked him to know why he didn't help her.

He asked me If I had seen that car.

The mother asked the twins If they had tidied up their room.

Tom asked how much that computer was

11. what the time was.

12. when they would meet again.

13. if he was crazy.

14. where they had lived.

15. if she would be at the party.

16. if I could meet her at the station.

17. who knew the answer.

18. why I didn't help her.

19. if I had seen that car.

20. if they had tidied up their room.

Bài 3:

asked how much that computer was.

Ta có: \(\left\{{}\begin{matrix}p+e+n=52\\p=e\\n-p=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}p=e=17\\n=18\end{matrix}\right.\)