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18 tháng 5 2022

Câu 11 chọn A 

Câu 12 chọn C

Câu 13 chọn B

19 tháng 6 2018

gọi số đó là ab

ta có: ab=8x(a+b)

         a x 10 + b =8 x a + 8 x b

        a x 2=b x 7

      vậy : ab =72 

19 tháng 6 2018

Gọi số đó là ab

Theo đề bài ta có:

   ab = 8( a+ b )

10a + b = 8a + 8b

      2a    = 7b  ( bớt mỗi bên đi 8a + b )

=> a = 7

   b = 2

   Vậy số cần tìm là 72

27 tháng 12 2021

I. Nội qui tham gia "Giúp tôi giải toán"

1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;

2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.

3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.

Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.

II. Cách nhận biết câu trả lời đúng

Trên diễn đàn có thể có rất nhiều bạn tham gia giải toán. Vậy câu trả lời nào là đúng và tin cậy được? Các bạn có thể nhận biết các câu trả lời đúng thông qua 6 cách sau đây:

1. Lời giải rõ ràng, hợp lý (vì nghĩ ra lời giải có thể khó nhưng rất dễ để nhận biết một lời giải có là hợp lý hay không. Chúng ta sẽ học được nhiều bài học từ các lời giải hay và hợp lý, kể cả các lời giải đó không đúng.)

2. Lời giải từ các giáo viên của Online Math có thể tin cậy được (chú ý: dấu hiệu để nhận biết Giáo viên của Online Math là các thành viên có gắn chứ "Quản lý" ở ngay sau tên thành viên.)

3. Lời giải có số bạn chọn "Đúng" càng nhiều thì càng tin cậy.

4. Người trả lời có điểm hỏi đáp càng cao thì độ tin cậy của lời giải sẽ càng cao.

5. Các bài có dòng chữ "Câu trả lời này đã được Online Math chọn" là các lời giải tin cậy được (vì đã được duyệt bởi các giáo viên của Online Math.)

6. Các lời giải do chính người đặt câu hỏi chọn cũng là các câu trả lời có thể tin cậy được.

27 tháng 12 2021

?????????????????????????

30 tháng 10 2021

mn giúp em vs ạ em cần gấp cảm ơn ạ 

 

6 tháng 12 2021

\(1.Ca+2HCl->CaCl2+H2\)

\(2.H2+Cl2->2HCl\)

\(3.2Mg+O2->2MgO\)

\(4.FeO+C0->Fe+CO2\)

6 tháng 12 2021

câu 4 hình như chx được cân bằng lắm

20 tháng 5 2021

202,1 : 0,125 + 202,1 : 0,2 - 202,1 : 1/3

= 202,1 x 8 + 202,1 x 5 - 202,1 x 3

= 202,1 x (8 + 5 - 3)

= 202,1 x 10

= 2021

Chắc vậy đó bạn!

20 tháng 5 2021

202,1 : 0,125 + 202,1 : 2 - 202,1 : 1/3

= 202,1 x 8 + 202,1 x 5 - 202,1 x 3

= 202,1 x ( 8 + 5 - 3 )

= 202,1 x    10

= 2021

~ Hok T ~

3 tháng 10 2019

Cần truy tìm ai v

tên THANH HÀ đó

16 tháng 10 2021

Bài 1:

a) Nhẹ hơn

b) Nhẹ hơn

c) Nặng hơn

d) Nhẹ hơn

16 tháng 10 2021

Bài 2:

a) Ta có: \(M_X=16\cdot2=32\left(đvC\right)\)

  Vậy X là Lưu huỳnh  (S)

b) Nhẹ hơn

c) 16 hạt

d) 17 hạt

AI CHỈ MÌNH VỚI MÌNH CẢM ƠN AI GIÚP MÌNH VỚI MÌNH CẢM ƠN NHIỀU21. Hoa looks red. She was outdoors yesterday. Perhaps she has _______                                                  A. flu                           B. sunburn                   C. spots                       D. stomachache22. My family has decided to use _________ electricity by using more solar...
Đọc tiếp

AI CHỈ MÌNH VỚI MÌNH CẢM ƠN
 

AI GIÚP MÌNH VỚI MÌNH CẢM ƠN NHIỀU

21. Hoa looks red. She was outdoors yesterday. Perhaps she has _______                                                  

A. flu                           B. sunburn                   C. spots                       D. stomachache

22. My family has decided to use _________ electricity by using more solar energy instead.                     

A. more                       B. less                          C. much                       D. fewer

23. I ............... playing board games interesting because I can play them with my friends.                         

A. find                                    B. think                       C. say                          D. tell

24. Circle the word that has the underlined part pronounced differently from the others.                          

A. curl                         B. keen                        C. city                         D. cook

25. I …………….. Nha Trang when I was a child.                                                                                      

      A. visit                              B. visited                     C. will visit                  D. have visited

26. He …………… to the USA so far.                                                                                                         

      A. is                                   B. was                         C. will be                     D. has been

27. Americans eat a lot of junk food, ………….junk food causes obesity.                                                  

      A. but                                B. and                         C. so                            D. because

28. Tim: I feel itchy and my nose is running. Doctor: ………………………..                                            

      A. Wash your hair more.                                       B. I think you have the flu.

      C. Drink more water. Eat less meat                      D. I think you have a stomachache.

29. Pick out the word whose main stress is placed differently from the others.                                           

      A. allergy                          B. headache                C. temperature           D. obesity 

30. Choose the word that has the underlined part pronounced differently from the others.                        

      A. cold                              B. curly                       C. ocean                     D. clothes

31. -“What would you like to drink now?”    - “_______________.”                                                          

            A. No, thanks              B. Yes, please             C. I like to do nothing            D. Orange juice, please

32. All of us enjoy _______ to classical music.                                                                                             

            A. listen                       B. listens                     C. listening                  D. listened

33. She worked very hard,  _______she passed all  her exams.                                                                    

A. because                   B. and                         C. so                            D. but

35. -“ Would you like me to turn off your computer?                                                                                   

    - “ ______________. I’ll do it myself”

            A. No, thanks              B. Yes, please             C. Don’t do it             D. Of course

PART B. WRITING

I. Put the verbs in the correct form.
1. I enjoy (fish) .................................................. because it (be) ……………….… relaxing.                       
2. Jane will play chess after she (finish) …………………………. school.                                                  

3. What …………………… your mother often (do) ………………………at weekends?                         

4. I think, in the future people (not play) ………………………………… individual games.                    

5. We find (arrange) ……………………… flowers interesting because it (help) ……………… us relax. 

6. I (not collect) ………….……………………… dolls when I grow up.                                                   

7. She often (go) ......................... to the market with her mother every weekend.                                       

8. We (visit) ...................... Hue next month.                                                                                                            

9. My younger sister (collect) ................. dolls two years ago.                                                                     

10. .................. you ever (do) ................. volunteer work ?                                                                           

II. Arrange these words/ phrases into the meaning sentences

1. sunburn / yesterday / was / because / outside / has / Alice / she / all / day .                                               

……………………………………………………………………………………………..

2. and / difficult / boring / that / eggshells  / people / carving / Some / say / is                                              

..…………………………………………………………………………………………..

3. girl / have / is / the / kind-hearted /  She / most / ever / I /met                                                                   

……………………………………………………………………………………………..

4. organization / the / to / encouraged / people /  Big Heart / has / protect / environment.                            

……………………………………………………………………………………………..

III. Write full sentences using the suggested words and phrases given.

1.Tuan / find / play / table tennis / interesting / because / he / can / play / best friends.                                

…………………………………………………………………………………………

2.They / visited / Ho Chi Minh City / so far.                                                                                                 

…………………………………………………………………………………………

3.Lan / like / talk / to / her friends / her free time.                                                                                         

…………………………………………………………………………………………

4. We/ not eat/ out/ since/ mom’s birthday.                                                                                                   

…………………………………………..

5. How/ long/ you/ live/ here?                                                                                                                        

…………………………………………..

6. You/ ever/ been/ Russia?                                                                                                                            

…………………………………………..

7. She/ not/ meet/ kids/ since Christmas.                                                                                                       

…………………………………………..

8. They/ repair/ lamps/ yet?                                                                                                                            

…………………………………………..

IV. Complete each sentence so it means the same as the sentence above.

1. I didn’t go to school because I was sick.                                                                                       

à I was sick, so …………………………………………………………………

2.It will be good if you eat less meat and more vegetables.                                                                          

à You should ………………………………………………………………………

3. He likes playing computer games in his free time.                                                                                     

à His hobby is ……………………………………………………………………..

4. I am interested in watching TV in the evening.                                                                                         

à I enjoy ………………………………………………………………………

5.I think that learning English is important.                                                                                                  

à I find ……………………………………………………………………………..

6. He started working as a bank clerk 3 months ago.                                                                                    

=> He has.................................................................................................................

7. I last had my hair cut in November.                                                                                                          

=> I haven't................................................................................................................

8. The last time we called each other was 5 months ago.                                                                              

=> We haven't.............................................................................................................

 

2
18 tháng 12 2021

21. Hoa looks red. She was outdoors yesterday. Perhaps she has _______                                                  

A. flu                           B. sunburn                   C. spots                       D. stomachache

22. My family has decided to use _________ electricity by using more solar energy instead.                     

A. more                       B. less                          C. much                       D. fewer

23. I ............... playing board games interesting because I can play them with my friends.                         

A. find                                    B. think                       C. say                          D. tell

24. Circle the word that has the underlined part pronounced differently from the others.                          

A. curl                         B. keen                        C. city                         D. cook

25. I …………….. Nha Trang when I was a child.                                                                                      

      A. visit                              B. visited                     C. will visit                  D. have visited

26. He …………… to the USA so far.                                                                                                         

      A. is                                   B. was                         C. will be                     D. has been

27. Americans eat a lot of junk food, ………….junk food causes obesity.                                                  

      A. but                                B. and                         C. so                            D. because

28. Tim: I feel itchy and my nose is running. Doctor: ………………………..                                            

      A. Wash your hair more.                                       B. I think you have the flu.

      C. Drink more water. Eat less meat                      D. I think you have a stomachache.

29. Pick out the word whose main stress is placed differently from the others.                                           

      A. allergy                          B. headache                C. temperature           D. obesity 

30. Choose the word that has the underlined part pronounced differently from the others.                        

      A. cold                              B. curly                       C. ocean                     D. clothes

31. -“What would you like to drink now?”    - “_______________.”                                                          

            A. No, thanks              B. Yes, please             C. I like to do nothing            D. Orange juice, please

32. All of us enjoy _______ to classical music.                                                                                             

            A. listen                       B. listens                     C. listening                  D. listened

33. She worked very hard,  _______she passed all  her exams.                                                                    

A. because                   B. and                         C. so                            D. but

35. -“ Would you like me to turn off your computer?                                                                                   

    - “ ______________. I’ll do it myself”

            A. No, thanks              B. Yes, please             C. Don’t do it             D. Of course

18 tháng 12 2021

I. Put the verbs in the correct form.
1. I enjoy (fish) ........................fishing.......................... because it (be) ……is………….… relaxing.                       
2. Jane will play chess after she (finish) …………finishes………………. school.                                                  

3. What ……………does……… your mother often (do) ………do………………at weekends?                         

4. I think, in the future people (not play) ……………won't play…………………… individual games.                    

5. We find (arrange) ………arranging……………… flowers interesting because it (help) ………helps……… us relax. 

6. I (not collect) ………….won't collect……………………… dolls when I grow up.                                                   

7. She often (go) ..........goes............... to the market with her mother every weekend.                                       

8. We (visit) ...........will visit.......... Hue next month.                                                                                                            

9. My younger sister (collect) ........collected......... dolls two years ago.                                                                     

10. ..........Do........ you ever (do) ........do......... volunteer work ?