5310 nguyên tử h2so3 nặng bao nhiêu gam

1 người đi bộ tới trường với vận tốc 4km/h thời gian của người đó đi tới trường là 15p vậy khoảng cách từ nhà tới trường là bao nhiêu

help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

mod toán giúp với ạ!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Xhbdbfnfjjfjfjfnfnnfnfnfnf fnfnnfnfnfb

cần gấp ạ 1. We were so _____________that our son had been chosen for the national team. (PRIDE) 2. The _____________of English is that it is becoming simpler and simpler. (STRONG) 3. A right amount of calcium added to our food will help to _____________our weak bones. (SOLID) 4. In ancient Greece, the owl was a symbol of _____________. (WISE) 5. Freedom of _____________is one of the fundamental rights. (SPEAK) 6. What old people fear most is _____________. (LONELY) 7. There are many _____________programs at the Festival in Hue. (CULTURE) 8. It’s education that helps with the _____________of knowledge. (RICH) 9. Esperanto proves to be useless because it is _____________. (POPULAR) 10. His _____________makes him a famous person. (POPULAR) 11. His _____________makes everybody dislike him a lot. (POPULAR) 12. Everything has its own _____________. (LIMIT) 13. The _____________children are opening their presents. (EXCITE) 14. Will you please give me some _____________explanation? (FAR) 15. You should _____________yourselves with the environment. (FAMILY) 16. _____________, they didn’t intend to do it. (ORIGIN) 17. The explanation of the accident is very _____________. (CONFUSE) 18. His _____________is unreasonable. (CONFUSE) 19. If it doesn't rain soon, there'll be a great _____________of water. (SHORT) 20. We can protect the environment by _____________air pollution. (REDUCE) 21. She was _____________pleased that she passed the exam. (EXTREME) 22. He is one of the most famous _____________in the world. (ENVIRONMENT) 23. The explorer who _____________America is Christopher Columbus. (DISCOVERY) 24. He has been nominated as the most effective _____________in the town charity program. (ACTIVE) 25. Solar energy doesn’t cause _____________. (POLLUTE) 26. We think that Mother’s Day should be celebrated _____________. (NATION) 27. You can’t drink water from that well because it is _____________. (PURE) 28. Your recent work has some _____________. (IMPROVE) 29. Air _____________makes us unhealthy. (POLLUTE) 30. Journalists are not always _____________in what they write. (ACCURACY) 31. They are very _____________in their approach. (SCIENCE) 32. Bad planning leads to _____________later. (DIFFICULT) 33. He wants to _____________his knowledge of computers. (WIDE) 34. It would be _____________to go to the party late. (POLITE) 35. The _____________children were waiting for their turns. (EXCITE) 36. He was well _____________with the success of the airplane. (SATISFY) 37. He finds history _____________. (FASCINATE) 38. We’re interested in _____________beauty of Ha Long Bay. (NATURE) 39. My uncle’s family lived in a _____________suburb 3 years ago. (DISTANCE) 40. Have you got any _____________about the graduation exam? (INFORM) 41. Laos is a _____________country. (DEVELOP) 42. We were surprised at his _____________in writing. (IMPROVE) 43. He’s always _____________to his mother. (help) 44. The notebook you are using is made of _____________paper. The paper has been recycled. (USE) 45. His classmates shouted _____________when he won the match. (EXCITED) 46. I slept _____________last night. (TERRIBLE) 47. Are you thinking of taking part in the fishing _____________. (COMPETE) 48. He is not a very _____________driver. (EXPERIENCE) 49. The man was imprisoned because of his _____________. (CARELESS) 50. He is a very well-known film _____________. (PRODUCE) 51. Salt has a _____________on food. (PRESERVE) 52. How many _____________are there in the UNO? (NATIONAL) 53. The _____________anthem of Great Britain is “God Save the Queen". (NATION) 54. He chooses his career as a _____________. (MATHEMATICS) 55. Winning the race was an _____________. (ACHIEVE) 56. _____________, he survived the crash without injury. (MIRACULOUS) 57. We are faced with a difficult _____________. (CHOOSE) 58. The United Nations _____________is an international one. (ORGANIZE) 59. The _____________of the world, poverty, aids, and literacy, is a burning concern. (SECURE)

Giải giúp mình bài 2 và 4 nhé các bn <3

cho các số thỏa mãn 0<a,b<1 thỏa mãn a+b= √1-a ² + √1-b ² .CMR a+b=1

tính bằng cách thuận tiện nhất: 1 giờ 45 phút + 105 phút + 1,75 x 8 giúp mik nha

viết và vẽ lại sơ đồ mạch điện hai hình luôn nha