CMR: $D^{i^{2}}[3^{3+n}]-\frac{1}{D[\frac{27}{8}.(\frac{3}{2})^{n}]}$ $=3+n$

Viết một đoạn văn trong đó có sử dụng 1 trợ từ , 1 thán từ khoảng 8 câu. Chủ đề tự chọn.

Cho 180g hỗn hợp 3 muối XCO 3 , YCO 3  và M 2 CO 3  tác dụng với dung dịch H 2 SO 4  loãng, phản ứng xảy ra hoàn toàn thu được 4,48 lít CO 2  (đktc), dung dịch A và chất rắn B. Cô cạn dung dịch A ta thu được 20g muối khan. Nung chất rắn B đến khối lượng không đổi thì có 11,2 lít khí CO 2  (đktc) bay ra và chất rắn B 1 . Khối lượng B và B 1  là bao nhiêu?

Alexander Fleming was born in 1881 in Scotland. He went to a small school in a village, and when he left school he didn't go to university. He worked for five years in an office. But his brother, Tom, was a doctor and helped Fleming to go to university and study medicine. So he went to London University and in 1906 he became a doctor. In 1915, Fleming married Sarah McElroy, an Irish woman. They had one son. During the First World War, many soldiers died in hospital because they didn't have the right medicines. So after the war, Fleming tried to find a drug that could help them. He worked for many years and in 1928 he discovered a new drug and he called it "penicillin". He later worked with an Australian and a German scientist to develop a drug that doctors could use. In 1945, they won the Nobel Prize in medicine for their work on penicillin. 1. Where was Alexander Fleming born 2. Did he work in an office before he went to university ? 3. What did he study at university ? 4. How many children did he have ? 5. What kind of drug did he discover? 6. When did he win the Nobel Prize in medicine ? →

Chứng minh rằng đa thức f(x) = 2$x^{2}$ + 6x + 10 vô nghiệm. Yêu cầu: - Giải thích rõ ràng. - Sử dụng các kiến thức đã học. Làm nhanh, đúng, chi tiết: vote 5* + cảm ơn + CTLHN

Tính giá trị biểu thức: ($12(2x+3y)^{3}$- $18(2x+3y)^{2}$) :(-6x-9y)

Nam usually (study) in the library. Now he (read) there

`1,` I started work for the company a year ago. `->` I've been... `2,` I (spend) .... a few days in Hue next week. `3,` How many people .... in the Second World War? a, die. b, have die c, were died d, died `4,` When I... home last night, I ... tired and I ... straight to bed. a, got/ was/ went b, had got/ was/ went c, get/ am/ go d, got/ had been/ went

Làm giúp mình bài I , chỉ cần đáp án thôi

Vẽ mầm hát Yc : digi not tradi , màu , line