một số khi nhân với 6 rồi cộng với 157 thì được 769. tìm số đó ? một số khi chia với 8 rồi cộng với 210 thì được 315. tìm số đó ?

I. Correct the verb form 1. He says he (come) __________________ here soon 2. He always (eat) _____________ a sandwich for breakfast 3. Why _________ you (leave) _________ the party early last night? 4. John and Mary (talk) _______________ on the phone now 5. My sister never (drink) _____________ coffee 6. He thinks he (be) ________________ rich someday 7. She (meet) ______________ her old friends tonight 8. The Robinsons (come) _____________ to Ha Noi in 2007 9. Tim (try) __________________ to improve his bad habits now 10. John and Susan (get) _____________________ married last year 11. I (see) _____________ in front of the bookstore last morning 12. He (study) _________________ about 2 hours every night 13. He (be) __________________ here five minutes ago 14. Look! the teacher (look) __________________ at you 15. I (visit) _________________ my grandfather yesterday 16. Hoa always (help) ___________ her parents doing the housework in her free time 17. Hoa (have) _____________________ breakfast with her parents now 18. You (have) ________________ a lot of new friends soon 19. English (be) _______________ the most popular language in the world 20. There (be) ________________ an interesting movie on TV last night 21. Bell (invent) __________________ the telephone in 1876 22. He (not eat) _________________________ anything every evening. 23. My mother (buy) ___________________ new clothes for Tet holiday next week 24. Listen! He (talk) _______________________ about you. 25. Yesterday, she (come) ____________________ to my house. 26. My mother __________________ a sick note for me yesterday. (write) 27. She never (stay) _______________ up late at night. 28. My mother (plant) _______________ flowers in the garden last Sunday. 29. Mozart (play) _______________ the piano when he (be) ______________ three. 30. I (brush) ____________ my teeth every night, but last night I (forget)______________ to brush them. 31. She needs (eat) _______________ a lot of vegetables and fruit. 32. He (not come) _______________ to the meeting last week. 33. My father never (take) _______________ medicine. 34. There (be) __________ nobody there when I (arrive) ______________ yesterday. 35. She never (stay) ____________ up late at night 36. Water (consist) ____ ___________ hydrogen and oxygen 37. They (live) ______ ________ in Hue 3 years ago 38. Please be quiet! I (try) _________________ to concentrate the lesson. 39. Hoa (invite) ____________ a lot of friends to her birthday party next week 40. Lan and I (see) ______________________ a movie tonight 41. They (buy) _________________ their house in 2005 42. He (go) ___________to school every day by bike, but yesterday he (go) ___________to school by bus 43. Minh usually (play) ______________ football after school 44. She (brush) ___________ her teeth every night, but last night she (forget)__________ to brush them 45. My mother (plant) _______________ flowers in the garden at the moment 46. Our class (have) _____________ a new English teacher next semester 47. My baby (sleep) _______________ at the moment 48. Tomorrow, my family (go) ______________ camping at Dam Sen park 49. It (rain) ___________________ heavily last night 50. He (need) ______________ a pen right now

Cho tam giác ABC, O là điểm nằm trong tam giác. Chứng minh rằng BOC=BAC+ABO+ACO

rút gọn các biểu thức sau : a, (-11)+y+7 ,b, x+22+(-14), c, a+(-15) +62 ,d, (-x)+(-13)+x+(-7),e, a+17+x+(-a)+(-10)

tìm tập hợp các số tự nhiên x,sao cho : (25+18+x) chi het cho 3 và 10 ≤x ≤15 giải chi tiết nha

Cho góc nhọn xOy. Gọi I là 1 điểm thuộc tia phân giác của góc xOy. Kẻ IA vuông góc với Ox (điểm A thuộc tia Ox) và IB vuông góc với Oy ( điểm b thuộc tia Oy) a) Chứng minh IA = IB b) Cho biết OI=10cm, AI=6cm. Tính OA c) Gọi K là giao điểm của BI và Ox và M là giao điểm của AI với Oy. So sánh AK và BM? Gọi C là giao điểm của OI và MK. Chứng minh OC vuông góc với MK

Tìm 1 số có 4 chữ số . biết nếu nhân số đó với 5 rồi cộng với 6 thì đc 1 số có 4 chữ số có thứ tự các chữ số ngược lại với số cần tìm

I. Choose one suitable word to complete the following passage. fishing singer Join Join in off watching when spend movies things house home I only have Sunday (1)………… so I have very little free time. Sunday is a wonderful day for me to (2)……….time with my friends and family. One of the (3)……….I really enjoy doing on Sunday morning is to go (4) ………….with my friends, although I am not always successful in catching fish. It is a time to relax and talk about the previous week’s events and future plans. I usually go (5)……..late in the afternoon. My family sometimes (6)……………..other relatives on Sunday evening at a karaoke restaurant and we all have a good time together. It is especially fun (7)……..my father gets up to sing. Please don’t tell him I said this, but he is a very bad (8)……..! Once in a while I go to the (9)……………with my friends or my brother. Sometimes, I just stay at home, listening to music, (10)……………videos or reading novels. II. Fill in each numbered blank with one suitable word. Alice is a new English friend of (1)…………….. . She is very (2) …………….to tell me about her new (3)…………… Her lessons begin at nine each morning and (4)……………until half past ten. Then she has a ………….for a quarter of an hour. During this time she usually talks to her friend about many things such (6) …………………the last class or last night’s movie, … . She has five (7) …………….in the morning and three in the afternoon. Alice’s favorite (8) ………..English. The first term lasts four months from September to December. Alice tries her (10)……………….to become a good student in the class.

: Cho tam giác ABC. Đường thẳng qua A song song với BC cắt đường thẳng qua C song song với AB ở D. Gọi M là giao điểm của AC và BD. a) Chứng minh: b) Chứng minh: MA = MC. c) Trên các đoạn thẳng AD, BC lần lượt lấy các điểm E, N sao cho AE = CN. Chứng minh ME = MN, ba điểm E, M, N thẳng hàng.

lá cây ở nơi khô hạn có lông sáp có tác dụng gì