Hòa tan hoàn toàn 5,28 gam hỗn hợp X gồm Cu và một oxit sắt FexOy trong H2SO4 đặc nóng (dư). Sau khi phản ứng xảy ra hoàn toàn thu được 448ml khí SO2 và dung dịch. Cô cạn dung dịch thu được 13,6 gam hỗn hợp muối khan Y a. Viết phương trình phản ứng xáy ra b. Tìm công thức phân tử oxit sắt, tính % khối lượng các chất trong Y.

Mẹ có nhóm máu O sinh đứa con nhóm O. Hãy biện luận để xác định KG của bố mẹ

(x+3)^2-2(x+3).Phân tích đa thức thành nhân tử

Chứng minh hằng đẳng thức:x^3-y^3=(x-y)^3-3xy(x-y)

cho hỏi là : mấy cái lực T,Q,P là gì vậy và làm sao để biết được các lực đó

The sharing of a family's life stories can be thought provoking and..for children,helping them learn,formulate a sense of identity,and put their own experiences into perspective A.benefit. b.beneficial. c.beneficiary. d.benefits

1. they report that miss ly will win the beauty contestant 2. they announced that two prisoners from prison last week 3.they thought that i would take care of these children 4. people rumour that he will buy his villa 5.people believed that the earth was flat 6. they announced that a bank had just opened in this city 7. people said that many children died in a storm last year 8.people thought that these students were trying hard to win the competition 9.they say that his wife has ever fallen in love with many men 10. people supposed that he was rich 11. they reported the president would return from usa turn these sentences into passive voice two ways

Hộ mình bài VI. Đúng nha . mình cần gấp

Các bạn giúp mk với nhé. Nếu có thể thì để lại giải thích cho mk luôn nha🎋

* choose A,B,C,D for each gap in the following sentences 1. We........ in a house in the country A. Live B. Living C. Lives D. Are live 2. It't hot today. I don't want to stay at home. I want....... swimming. A. Go B. To go C. Going D. Goes 3. Listen! ....... he singing in the bathroom? A. Does B. Is C. Do D. Are 4. My mother likes......... our summer holidays at the seaside A. Spend B. Spends C. Spending D. Is spending 5. Wher are you, Hoa? - I'm downstairs. I......... to music A. To have B. Have C. Having D. Has 6. What do you usually......... for breafast? A. To share B. Share C. Sharing D. Shares 7. My close friend is ready ......... things with her classmates. A. To live B. Live C. Living D. Lived 8. Last year, I........ with my family in a big house in Tuyen Quang A. To live B. Live C. Living d. Lived 9. My friend, Nga is very hard-working. She......... most of her time at studying last year A. To spend B. Spends C. Spending D. Spent 10. This saturday we..... to Art Museum A. Go B. Is going C. Are going D. Went