Hợp chất của nguyên tố X với O là XO. Hợp chất của nguyên tố Y với H là YH3. Công thức hóa học của hợp chất của X với Y là A. XY. B. XY2. C. X3Y2. D. X2Y.

Vẽ mầm N/L: một em mà mik quen ở trên mạng thì em ấy thích anh ấy tên H nha thì anh ấy 19 tuổi là con riêng của mẹ em ý thì em cx ko biết là phải làm thế nào ẻm 2k7 nam nha

Cho biết nếu vẽ các đường kinh tuyến, vĩ tuyến cách nhau 1 độ thì trên Địa Cầu có bao nhiêu kinh tuyến, vĩ tuyến.

Chọn công thức hóa học đúng trong các công thức sau. Biết hợp chất gồm N hóa trị IV và O. A. NO. B. N2O. C. NO2. D. N2O3.

Ai giúp mình với ạ cần gấp luôn nhé

Giúp mình 2 bài với plssssssssss

III. Choose the best answer A, B, C or D to complete the sentences. 11. There are many why it is important to have a hobby. A. answers B. reasons C. details D. facts 12. Will you making models in the future? A. pick up B. look for C. take up D. find 13. Do you think that hobby is and boring? A. easy B. difficult C. danger D. interesting 14. I love my sister’s paintings because she is very in using colours. A. careless B. care C. creative D. imagine 15. A hobby helps you to connect with people. A. other B. others C. another D. the 6. I join a photography club, and all the members love a lot of beautiful photos. A. take B. taking C. make D. making 17. What does your father do his free time? A. in B. at C. on D. while 18. I think a hobby will always give you and help you . A. pleased - relax B. pleasure - relaxed C. pleased - relaxing D. pleasure - relax 19. You can share your stamps other collectors a stamp club. A. with - at B. to - at C. with - in D. to - in 20. I think this hobby does not cost you much, and you need is time. A. most B. all C. some D. all of 21. Nowadays people hours sitting in front of computers. A. take B. last C. set D. spend 22. I think you should take up swimming it is suitable for your health condition. A. so B. because C. although D. but 23. My family enjoys because we can sell vegetables and flowers money. A. garden - to B. gardening - for C. gardening - with D. garden - of 24. If your hobby is greeting card making, you can give your to your friends as presents. A. hobby B. money C. greetings D. products 25. My sister’s hobby is sewing, and she can get the sewing patterns from the magazines. A. fashion B. cooking C. sports D. science 26. My brother doesn’t like ice-skating because he thinks it is . A. danger B. in danger C. dangerous D. endangered 27. My sister is very keen on swimming, and she goes swimming three a week. A. time B. a time C. times D. timings 28. We often read the instructions carefully in order to make of the things we like best. A. meanings B. models C. copies D. uses You need to be to follow eggshell carving because it may take two weeks to complete one shell. A. careful B. interested C. fit D. patient 30. If you choose sewing as your hobby, you will your own clothes. A. do B. make C. take D. get IV. Fill in each blank with a suitable hobby. 31. : a game played by two people on a square board, in which each player has 16 pieces thay can be moved on the board in different ways. 32. : the job or activity of working in a garden, growing and taking care of the plants, and keeping it attractive. 33. : a game played by two teams of five men or six women who score points by throwing a large ball through an open net hanging from a metal ring. 34. : the sport or activity of riding a bicycle. 35. : the art of moving your body to music. 36. : moving across ice using special shoes with a thin metal bar fixed to the bottom that you wear to move quickly on ice. 37. : the activity of running at a slow regular speed, especially as a form of exercise. 38. : the hobby of studying wild birds in their natural environment. 39. : the hobby of studying wild birds in their natural environment, physical exercises and activities performed inside, often using equipment such as bars and ropes which are intended to increase the body’s strength and the ability to move and bend easily. 40. : the activity or job of taking photographs or films. V. Fill in each blank with ONE suitable word. 41. We playing table-tennis very interesting because we can meet and make friends with interesting people. 42. My brother and I the same hobby. 43. I love outdoors in my garden to plant flowers and vegetables. 44. My father likes his bike in the park at the weekend. 45. Tom and Peter like water , and they go swimming, play water polo and surf together a lot. 46. My hobby is collecting because I love reading whenever I have time. 47. Why don’t you jogging because it can help you keep fit? 48. I really enjoy going round the shops in my town to for rare and old teacups. 49. My parents have just bought a new of roller skates. 50. It is very to collect motorcycles because it costs you a lot of money to buy them and get them repaired. Nhiều câu lắm nên ko cần giải thích đâu nhé ( luật hoidap bảo câu nào cx giải thích nhưng nếu nhiều quá đc miễn mừ ) :Đ

Giúp mình với mình đang cần gấp gấp

1/(2.3) + 1/(5.8)+...+1/(98.101)

Trong mp(Oxy) cho đường tròn (C) có phương trình x +y -4x+6y+9=0 và đường thẳng A: 2x- y+10 =0; hai điểm A(-5:7):B(3:1). 1/ Viết phương trình tham số và phương trình tổng quát đưong thăng d qua A,B. 2/ Viết phương trình đường tròn đường kính AB. 3/ Xác định tâm I và bán kính R của đưong tròn (C) 4/ Viết phương trình đưong thàng d, đi qua I và vuông góc với đường thàng A 5/Viết phương trình tiếp tuyến d, của (C), biết tiếp tuyến đi qua M=(1-5)