S=(1,6.+1,2).5=14km

k le toan 7?

Put the verbs in brackets in the correct form, past simple or present perfect

29. The last time I ............went ...........(go) to Brighton was in August

30. I .........finished.............. (finish) my homework. I ...........have done............ (do) it before tea

31. And the race is over! And amickey Simpron ...........has won............(win) in a record time

32. Of course I can ride a bike. But I ...........haven't driven............ (not/drive) one for years

33. Martin ............has been...........(be) to Greek five times. He loves the place

34. I don't know Carol's husband. I have never .............met..........(meet) him

35. Rupert..........has left.............(leave) a message for you. He ........rang...............(ring) last night

36. Your car looks very clean. have You ...........washed........ (wash) it ?

37. We ..........moved............. (move) here in 1993. We ............have been........... (be) here for a long time now

38. Mr.Clack .............has worked......... (work) in a bank for 15 years. The he gave up

39. Is this the first time you...........have cooked...........(cook) pasta ?

40. I .........have worked.............(work) for a computer company since I ..........graduated.............(graduat) from university

41. We ...........posted...........(post) the parcel three weeks ago. If you still .........haven't received.............(not receive) it, please inform us immediately

42. Albert Einstein ...........was............(be) the scientist who.............developed.........(develop) the theory of relativity

43. My grandfather ..........died............(die) 30 years ago. I ............have never met......... (never meet) him

44. Is your father at home ? No, I'm afraid he...........has gone...........(go) out.

When exactly did he............go..........(go) out? About ten mintes ago

45. Where do you live? Boston

How long you ........have you lived..............(live) there? 5 years

Where did you ...........live...........(live) before that? Chicago

How long have you ........... lived...........(live) in Chicago? 2 years

46. have You ever............been..........(be) to the Tretyakov Gallery? yes,I ...........have been...........(be) there sevelar times

47. have You...........seen........... (see) your aunt lately ? No,she ............hasn't been..........(not be) out since she ..........bought............(buy) her telephone set

48. I .............bought......... (buy) this hat in Tran Phu Street. How much did you ...........pay...........(pay) for it ?

49. Oh, is it you, John. You ...........haven't been...........(not be) in touch with me for a long time. I'm glad you ............have rung..........(ring) me up. Where have you.............been.........(be) all these weeks? I hope you..........won't be...........(not be) ill?

50. I ..........rang............(ring) you up two days ago but I ..........got............(get) no answer. Where were you .......................(be) ?

Cả hai buổi cửa gàng bán được số phần gạo trong kho là :

       1/3 + 1/4 =1/7  ( số gạo )

        Đ/S : 1/7 số gạo

Translate into English

1. Trời quá nắng cho chúng tôi đi dã ngoại (too...to)

-> The weather is too hot for us to go camping

2. Đèn không đủ sáng cho tôi học bài (enough)

-> The lamp isn't light enough for me to study

3. Bộ phim rất là thú vị đến nỗi mà chúng tôi xem lại nhiều lần (such...that)
-> It is such an interesting film that we watched it many times

Rewrite

4. "You should go to the library often" The teacher told him

-> The teacher advised him to go to the library often

5. "Why don't you go to the party?" He asked me
-> He asked me to go to the party

A=2^19.3^9+3.5.2^18.3^8/3^9.2^9.2^10+3^10.2^20.

A=2^18.3^9.2+3^9.2^18.5/3^9.2^18.2+3^9.

A=3^9.2^18.(2+5)/3^9.2^18.(2+3.2^2).

A=7/14.

A=1/2.

Vì a+b/a-b=c+d/c-d => a+b/c+d=a-b/c-d

Dựa vào tính chất của dãy tỉ số bằng nhau ta có: a+b/c+d=a-b/c-d=a+b+(a-b)/c+d+(c-d)=a+b+a-b/c+d+c-d=2a/2c=a/c (1)

                                                                       a+b/c+d=a-b/c-d=a+b-(a-b)/c+d-(c-d)=a+b-a+b/c+d-c+d=2b/2d=b/d (2)

Từ (1),(2)suy ra: a/c=b/d

VỚI A>B SUY RA A/B >1 => (A+N)B=AB+BN>AB+AN=A(B+N)=>A+N/B+N > A/B

VỚI A<B TƯƠNG TỰ SUY RA A+N/B+N < A/B 

VỚI A=B SUY RA A+N/B+N = A/B

mk viết thiếu xin lỗi 

Số đó là : 9840

đúng đó bn

Hu cai ten Nguyen Trung Hieu dang ghet kia tai nguoi ma ta bi 290 diem do dang ghet yeu tinh xau xa