Bài 1: Lập phưng trình TQ và TS của đường thẳng đi qua điểm M và có vtpt á biết: a M(k-1): a-(2:1) b. M(04): n=(-1:3) Bài 2: Lập PTTS và PTTQ của đường tháng đi qua điểm M và có vtcp u biết: a. M(t-2): u- (L0) b. M(S.3): u=(-3:1) Bài 3: Lập phưng trinh đường thắng đi qua 2 diểm A và B trong các trường hợp sau: b. A(42). B(-L-2) a A(-k1), B(2:1) Bài 4: Lập phương trinh đường trung trực của doạn thẳng AB biết: a A(l:1), B(-3.1) b, A(3,4), B(L-6) Bài 5: Lập phương trìinh đường thắng (d) biết: a di qua điểm M(2:-1) và có hệ số góc k = 2 b, đi qua điểm M(0;4) và có hệ số góc k= c, di qua điểm M(-3:-1) và tạo với hướng dương trục Ox góc 45. d, di qua điểm M(3:4) và tạo với hưởng đương trục Ox góc 60. Bài 6: Chuyển (d) về dạng tham số biết (d) có phương trình tổng quát: a. 2x - 3y = 0;

Hãy tính tổng các số nguyên x thỏa mãn -2016<_ x _<2018

Cho 1,28 gam mot kim loai M hoa tri 2 tac dung vua du voi 0,448 lit khi cl2 . Xac dinh ten kim loai M va khoi luong muoi tao thanh

giúp em với phần a nhé . Đang cần gấp

* Finish each of the following sentences in such a way that it means exactly the same as the sentences printed before it. 1. The trains couldn’t run because of the snow. ⇒ The snow .. 2. I didn’t arrive in time to see her. ⇒ I wasn’t early ..... 3. I’m sorry I was rude to you yesterday. ⇒ I apologize ..... 4. He didn’t hurry, so he missed the train. ⇒ If ...... 5. Janet is the best tennis- player in the club. ⇒ No one ....... 6. I haven’t seen that man here before. ⇒ It’s ......... 7. The furniture was so expensive that I didn’t buy it. ⇒ The furniture was too ......... 8. The robbers made the bank manager hand over the money. ⇒ The bank manger ......... 9. He learned to drive when he was 18. ⇒ He has ................................................................................................ 10. She had never been unhappy before. ⇒ She was unhappier ................... 11. It was so late that nothing could be done. ⇒ It was too .......... 12. I asked the hotel porter to wake me at 8 o’clock the following morning. ⇒ “ Please ......... 13. They’ll have to change the date of the meeting again. ⇒ The date ...... 14. The garage is going to repair the car for us next week. ⇒ We are going ............ 15. The bus takes longer than the train. ⇒ The train .............. 16. John has not had his hair cut for over six months. ⇒ It’s ............ 17. Maria says she’ll like to have been put in a high class. ⇒ Maria wishes ....... 18. Would you like me to finish the work tonight? ⇒ I’ll .... 19. You may get hungry on the train, so take some sandwiches. ⇒ In ..... 20. My husband didn’t leave the car keys, so I couldn’t pick him up at the station. ⇒ If my husband .............. 21. “I don’t think John will come,” said Bill. ⇒ Bill doubted ..... 22. The postman was bitten by our dog. ⇒ Our dog .......... 23. We couldn’t drive because of the fog. ⇒ The fog prevented ........ 24. Although his leg was broken he managed to get out of the car. ⇒ In spite .. 25. The cake was so hard that I could not eat it. ⇒ It was ... 26. We didn’t go because it rained. ⇒ If it hadn’t ... 27. I can’t cook as well as my mother does. ⇒ My mother ......... 28. I don’t suppose you have change for a pound, do you? ⇒ Do you happen ........ 29. He failed to win the race. ⇒ He didn’t ..... 30. Mary rang hours and hours ago. ⇒ It’s hours ...... 31. I’m sorry that I didn’t finish my homework last night. ⇒ I wish .......... 32. She asked John how he liked her new dress. ⇒ “How....... 33. A train leaves at eight o’clock every morning. ⇒ There is ............ 34. Nobody can deny that she has a beautiful voice. ⇒ It ...... 35. I would like you to help me to put the chairs away. ⇒ Do you mind ......... 36. The child will die if nobody sends for a doctor. ⇒Unless ....... 37. He would prefer you to pay him immediately. ⇒ He’d rather ............ 38. The water was so cold that the children could not swim in it. ⇒ The water was not ........ 39. Somebody repaired her car yesterday. ⇒ She .... 40. You must see the manger tomorrow morning. ⇒ You’ve ....... 41. There was never any answer when we rang. ⇒ Every ......... 42. That’s an insulting name to use for him. ⇒ Don’t call ........ 43. John asked if it was the blue one or the green she wanted. ⇒ “Which .... 44. She liked Paris very little, and Rome less. ⇒ She thought Rome ....... 45. I can meet you if you arrive before eleven. ⇒So ..... 46. They will catch all the prisoners again by tonight. ⇒ All the prisoners ........ 47. I’ve warned you not to go near that dog. ⇒ I’ve warned you about ..... 48. No, please don’t tell him. ⇒ I’d rather ......... 49. Why don’t you ask her yourself? ⇒ I suggest ......... 50. An up- to- dated visa is necessary for Andorra. ⇒ You’ll .....

(X-2)(y+1)=23 tìm x , y thuộc Z

cho tam giác ABC , vuông tại B,kẻ AH vuông với BC,biết AB = 3cm,BC = 4cm,AH = 2.4cm. Tính độ dài các đoạn thẳng AC, BH , CH (ai giúp mik với )

Câu 1:Vào mùa đông nhất là những ngày hanh khô,khi cởi áo len ta thường thấy những tiếng nổ lép bép nhỏ.Vào ban đêm khi cởi áo ta còn thấy sự phóng các tia lửa điên.Hãy giải thích? Câu2:Một quả cầu nhẹ treo bằng sợi chỉ tơ bị một chiếc đũa hút.Một bạn khẳng định chắc chắn rằng chiếc đũa đã bị nhiễm điệm từ trước.Em hãy nêu nhận xét về điều khẳng định của bạn.Nếu như quả cầu bị đẩy ra xa chiếc đũa thì em có kết luận gì? Câu3:Khi cọ xát thanh đồng,hoặc thanh sắt vào một miếng len rồi đưa lại gần các mẩu giấy vụn thì ta thấy các mẩu giấy vụn không bị hút.Như vậy có thể kết luận rằng kim loại không bị nhiễm điện do cọ xát hay không?Vì sao?

tìm x: x.(x+3)=0 (x+1)(x^2)=0 10+|x|+3|x| (-4)^2-3|x| 5x-7chia hết cho x

Exercise 1: Write “since” or “for” 1. She has been there __________________________ four days. 2. I have known Linda _______________________________ last month. 3. Jack has stayed here _______________________________Thursday. 4. My aunt has lived in Australia _______________________15 years. 5. We have had a camer ___________________________________1995. 6. They have been married ___________________________I was eight. 7. Liz has studied medicine __________________________ a long time. 8. It has rained __________________________an hour. 9. Indian has been an independent country ____________ centuries. 10. Mike has been ill _____________________yesterday. Bài 2; Put the verbs into the correct tense (simple past or present perfect simple). 1. I (visit) __________ our form teacher in the hospital already. 2.John (read) just __________ the letter from Mary. 3.We (not begin) ________________ to learn for the test yet. 4.I (meet) ___________ Robert at the supermarket this morning. 5.Nancy (be) ________________ to Viet Nam several times. 6.They (not start) __________ the project last night. 7.Your father (give up)__________________ smoking in 2008? 8.He (clean)_________________________ his motorbike for two hours? 9.Tom (call)__________________his boss yesterday? 10. Your parents (visit)_________________ Da Lat last summer? đây Trang nhé