((√x)/(√x-1)+(√x)/(√x+1))÷(2/x-(2-x)/(x√x+x)) tìm điều kiện vào rút gọn hộ mình

` SO_3 + NaOH \to NaHSO_4` ` SO_3 + 2NaOH \to Na_2SO_4 + H_2O` Mình muốn hỏi là hai phương trình này nó xảy ra đồng thời cùng 1 lúc hay là tùy vào điều kiện mà nó xảy ra PT 1 hoặc PT 2 , nếu đúng như thế thì điều kiện là gì?

Cho a gam hỗn hợp Fe và Cu (Fe chiếm 30% về khối lượng) tác dụng với dung dịch chứa 0,69 mol HNO3 tới khi phản ứng xảy ra hoàn toàn, thu được 0,75a gam chất rắn A, dung dịch B và 0,6048 lit hỗn hợp khí X (dktc) gồm NO2 và NO. Tính khối lg muối trong dd B và giá trị của a

Vẽ anime/chibi:3 Tradi/digi, kí, chụp rõ/layer, không trace, không phạm luật hoidap;-;; NL: Hóng tranh nào đọ kó nét mlem😳✨

Use the correct form of the word in brackets to complete the following sentences. 36. Reduction in government spending will ……………………….………further cuts in public services. NECESSARY 37. Good hygiene helps to ………………………..the risk of infection. MINIMUM 38. She at first wanted to be a …………………………………..but now she works as a doctor. LAW 39. In many countries it is ………………………………..to smoke cigarettes under the age of sixteen. LEGAL 40. An investigation has been under way for several days into the …………………………….. of a thirteen-year-old boy. APPEAR 41. Nicholas …………………………………..admitted that the report was a pack of lies. FRANK 42. There’s a high …………………………………..that the children will follow a different career. PROBABLE 43. The northern part of our country was slow to …………………………………... INDUSTRY 44. She has always been …………………………………..on our educational issues recently. SPEAK 45. The …………………………………..of the trains and the buses causes frustration and annoyance. FREQUENT

Tại sao ` Fe_2O_3` tác dụng với `HCl` tạo thành ` FeCl_3` mà không phải là ` FeCl_2`

Giúp em câu B với ạ , mai em thi rồi huhu

Vẽ fanart của bạn về Susamaru và Enmu (Kny) nha

Ai giỏi máy tính chỉ e với Muốn cái đó ko hiện lên thì làm sao ạ?? :((

helppppppp Read the text and fill in one word which best fits each gap. LOOKING FOR A JOB I finished university six month (76) ........, I’ve got a degree in business administration. I enjoyed the course very much although I realize I should have studied a lot harder! A few of my friends have (77) ...........got full-time jobs but most of us are still waiting (78) ..............something suitable to turn up. Meanwhile, I make sure that I keep myself busy. I look through the job advertisements (79) ..........the newspapers every day and I also ask all the people I know to tell me if they hear of any vacancies (80) .....................they work . What I am looking for is something challenging and I would certainly be happy to move to another city or even work abroad for a while. The (81) ..................is not so important at this stage, provided I earn enough to live on, (82).............................I don’t want to continue having to depend on my parents , although they are (83) ..........................generous to me. At the moment, I’m working in a nearby restaurant two evenings (84) .................. week, washing up and generally helping out, which brings a little money. The other people working there are very friendly, and many of them are in the same (85) ....................... as me, so we have lots of to talk about.