Bài giải :

Nếu viết thêm một chữ số 0 vào tận cùng bên phải số đó thì số đó gấp lên 10 lần .

Suy ra số mới gấp 10 lần số cần tìm .

Hiệu số phần bằng nhau là : 

10 - 1 = 9 ( phần ) 

Số cần tìm là : 

4212 : 9 = 468

Đáp số : 468

ta có: góc MKN= gócMKC+góc NKC=180 độ

         gócMKB=gócNKC

ta có: góc BKC=gócMKC +góc NKC=gócMKC+ góc MKB=180 độ

suy ra 3 điểm B,C,K thẳng hàng

[1]. Complete the sentences with correct form of the verbs from the box: join - take – turn down – turn on - turn off - move – lend – ask – open - stay - buy ride - sit – smoke – show - give - drive - lend - use - help – get.

1. Would you mind showing me how to use this machine ?

2. Would you mind opening the windows ? It’s too hot in here.

3. Would you mind moving your car ? It’s in my way.

4. Do you mind if I took a photo of your family ?

5. Would you mind turning off the radio ? I’m reviewing my lesson.

6. Do you mind if I sat here waiting for the manager ?

7. Would you mind not smoking here ?

8. Would you mind lending me your motorbike for a while ?

9. Would you mind giving me a lift to the city center ?

10. Would you mind if I asked you some questions about your school activities ?

11. Would you mind if I used your computer for some minutes ?

12. Would you mind borrowing your pen for a moment ?

13. Would you mind driving me a round the town ?

14. Would you mind if I stayed with you for a week ?

15. Wopuld you mind helping her to finish her work ?

16. Dou you mind if I rode your bike ?

17. Would you mind buying me some sandwiches ?

18. Would you mind if my friend joined in our trip ?

19. Do you mind if we got a taxi to a town ?

20. Would you mind turning on the lights ? It’s very dark here.

[2]. Complete the second sentence so that it has the same meaning to the first:

1. Would you please turn off the light ? - Would you mind turning off the light?

2. Could you open the window, please ? - Would you mind opening the window?

3. Please don’t swim in the deep water. - Would you mind not swimming in the deep water?

4. May I move your luggage ? - Do you mind if I move your luggage?

5. You shouldn’t use the office phone for personal calls ? - Would you mind not using the office phone for personal calls?

6. Can you take me a photo ? - Do you mind taking me a photo?

7. Could you wait a moment, please ? - Would you mind waiting a moment?

8. Will you turn down the TV, please ? - Do you mind turning down the TV?

9. Could you lend me some money ? - Would you mind lending me some money?

10. Let me make you a some coffee. - Would you mind if I made you some coffee?

11. Don’t leave the door open. - Would you mind closing the door?

12. Let me help you do your homework. - Would you mind helping me do my homework?

13. I will call the police for you. - Would you mind if I called the police for you?

14. Take your shoes off. - Do you mind taking your shoes off?

I wish my neighborhoods didn't make a lot of noise at night.

ta lấy vd cụ thể như cạnh là 1 thì sxq : 1*1*4

nếu gấp lên 3 lần thì : 1*3*1*3*4=>sxq ls gấp sxq lđ số lần : 1*3*1*3*4/1*1*4=3*3=9

a. Put the verb in brackets into the correct tense:

1.If I see him, I (give) ...........will give............................ him a gift.

2.If he (study) ...............studies..................... hard, he can pass the exam.

3.Rice plants (grow) ..........will grow...................... if there is enough rain.

4.If she (not hurry) .........does not hurry........................, she may be late.

5.If I tell you a secret, ..will............. you (promise) ......promise.................. not to tell it to anyone ?

Nếu bớt CD 15 cm thì HCN trở thành HV,vậy nên CR kém CD 15 cm

Nửa chu vi HCN là: 170:2=85 (cm)

CD HCN là: (85+15):2=50 (cm)

CR HCN là: 85-50=35 (cm)

Vậy diện tích HCN là:50x35=1750 (cm vuông)

ko còn cái nào đúng hơn đâu nên nhak em

=(1+9)+(2+8)+...+(4+6)+5

=10.4+5

=40+5

=45