Cho △ABC . Gọi D và E là hai điểm lần lượt thuộc AB và AC sao cho DE//BC. Xác định vị trí của điểm D để chu vi của △ADE=\(\dfrac{2}{5}\)chu vi của △ABC . Tính chu vi của mỗi tam giác biết tổng chu vi của hai tam giác là 63cm

Cho △ABC.Gọi D,E là hai điểm lần lượt thuộc AB và AC sao cho DE//BC. Xác định vị trí của điểm D để chu vi của △ADE = $\frac{2}{5}$ chu vi của △ABC.Tính chu vi của mỗi tam giác biết tổng chu vi của hai tam giác là 63cm

https://hoc24.vn/cau-hoi/cho-abcgoi-de-la-hai-diem-lan-luot-thuoc-ab-va-ac-sao-cho-debc-xac-dinh-vi-tri-cua-diem-d-de-chu-vi-cua-ade-dfrac25-chu-vi-cua-abctinh-chu-vi-cua-moi-tam-giac-biet-tong-chu-vi-cua.8813432327782#:~:text=Cho%C2%A0%E2%96%B3ABC.G%E1%BB%8Di,gi%C3%A1c%20l%C3%A0%2063cm

cho tam giác MNP vuông tại M MN = 6 cm MP = 8 cm NP = 10 cm đồng dạng với tam giác ABC tam giác ABC có cạnh nhỏ nhất là 3cm.Tính các cạnh còn lại

Cho △ABC.Gọi D,E là hai điểm lần lượt thuộc AB và AC sao cho DE//BC. Xác định vị trí của điểm D để chu vi của △ADE = \(\dfrac{2}{5}\) chu vi của △ABC.Tính chu vi của mỗi tam giác biết tổng chu vi của hai tam giác là 63cm

Cho $\Delta$ABC. Gọi D và E là hai điểm lần lượt thuộc AB và AC sao cho DE//BC. Xác định vị trí của điểm D để chu vi của tam giác $\Delta$ADE bằng $\frac{2}{5}$chu vi của tam giác $\Delta$ABC. Tính chu vi của mỗi tam giác biết tổng chu vi của hai tam giác là 63 cm

Cho △ ABC.Từ điểm A kẻ tia Am//BC.Gọi D là trung điểm của BC.Qua D kẻ đường thẳng bất kì cắt AM tại E,cắt AC tại Q và cắt AB tại P.CMR \(\dfrac{PE}{PD}\) = \(\dfrac{QE}{QD}\)

6.       If I had free time, I         __________some shopping with you.

   A. did                   B. will do             C. would do         D. would have done

·       7.       If you_________English well, you will communicate with foreigners.

o   A. speak               B. had spoken      C. speaks             D. spoke

·       8.       If he had known her telephone number, he________her.

o   A. had rung                                       B. would have rung

o   C. would ring                                     D. will ring

·       9.       Unless she__________, she will be late for school.

o   A. hurried             B. hurries             C. will hurry         D. is hurrying

·       10.     I would have given him this present, if I__________him.

o   A. had meet                   B. had met            C. meet                 D. met

·       11.     I would have visited you if I_________busy with my homework.

o   A. hadn't              B. hadn't been      C. wouldn't be      D. wasn't

·       12.     If you had caught the bus, you__________late for work.

o   A. wouldn't have been                      B. would have been

o   C. wouldn't be                                   D. would be

·       13.     Will you be angry if I__________ your pocket dictionary?

o   A. stole                                             B. have stolen

o   C. were to steal                                 D. steal

·       14.     If__________as I told her, she would have succeeded.

o   A. she has done                       B. she had done

o   C. she does                              D. she did

·       15.    If the wall weren’t so high, I__________it up to take my ball down.

o   A. climbed                               B. could climb

o   C. is climbing                          D. climb

·       16.     If he__________the truth, the police wouldn't arrest him.

          A. tells                  B. told                  C. had told           D. would tell

17.     If you press that button, what_________?

          A. would happen                     B. would have happened

          C. will happen                         D. happen

18.     Would you mind if I__________ the windows?

          A. open                B. opening            C. opened             D. would open

19.     If they__________ me to their wedding party, I wouldn’t refuse.

          A. had invited                          B. invited

          C. invite                                   D would have invited

20.     If I were you, I_________ this job.

          A. accept                                           B. will accept      

          C. would have accepted                              D. would accept

21.     If my mother ________ me up, I will catch the bus.

A. doesn't pick         B. didn’t take         C. not pick          D. hadn’t picked

22.     If John had played for our football team, we________the match.

          A. would win                           B. will win

          C. win                                      D. would have won

23.     If the weather is nice, I ________for a walk.

          A. will go                                 B. go

          C. would go                             D. would have gone

24.     If you had tried your best, you__________the final exam.

          A. wouldn't fail                       B. wouldn't have failed

          C. won't fail                                      D. hadn't failed

25.     If she had money, she__________that house.

          A. would have bought             B. could buy

          C. will buy                               D. had bought

26.     If I had a map, I________.

          A. can get lost                         B. won't get lost

          C. wouldn't have got lost                  D. wouldn't get lost

27.     I would not have read your diary if you_____it in such an obvious

place.

          A. didn't hide       B. hadn't hid        C. hadn't hidden   D. not hid

28.     The problems would be solved if the government ________some measures.

          A. takes                B. took                 C. had taken         D. would take

29.     I will help you if you________my secret.

          A. kept                 B. will keep                    C. keep                 D. would keep

30.     ________, the accident would not have happened yesterday.

 A. If Nam drives more carefully          B. If had Nam driven more carefully

     C. Had Nam driven more carefully       D. Unless Nam had driven more carefully

31.     I'd give up my job if I________a big prize in a lottery.

          A. win                  B. won                 C. had won                    D. would won

32.     I'll help you if__________________.

          A. you told me the truth                             B. you tell me the truth

          C.you will tell me the truth                         D. you have told me the