vẽ mầm zui zẻ Nl: hôm nay zui cực

Hỗn họep x gồm sắt(3)oxit và nhôm oxit.Cho hidro đi chậm qua ống sứ đựng 36.4g hỗn hợp X cho đến khi phản ứng xảy ra hoàn toàn.trong ống sứ còn 31,6g chắt rắn.tính%m các chất trong hỗn hợp x

làm giúp tui câu c tui thật chi tiết nha 40 đ đó

Câu này em không chắc lắm về bài làm của mình nên mong mng kiểm tra giúp e với ạ 😅. E cảm ơn ạ ^^

Cho tôi hỏi 40000 feet là bao nhiêu m (làm tròn số thập phân thứ nhất)

Các bác giải thích cho em hiểu với ạ

169. Lan……………….. A. has a round black eyes B. has eyes round black C. is round black eyes D. has round black eyes 170. to buy. / These blue / trainers are / for me / too expensive ................................................................................................................................................... 171. your / new / trousers / Are / black? ................................................................................................................................................... 172. Where do you _ _ _ _ ? (nghe) 173. On my fifteenth birthday, my father bought me a c _ _ _ _ _ _ _ . 174. I am writing a letter ……………..my pen friend. A. to B. at C. on D. in 175. I was pleased ……………the present you gave me on my 10th birthday. A. with B. about C. of D. to 176.for / to say / your help. / I would like / thank you ................................................................................................................................................... 177. doesn’t / My mother / eat / for dinner. / much ................................................................................................................................................... 178. Does your mother live in the country or in the _ _ _ _ ? 179. Kate and I are reading books _ _ _ _ _ pets. 180. I have a glass of water or fruit……………….with my meat. A. water B. lemon juice C. juice D. soda 181. A. teacher B.cooker C. farmer D. worker 182. sit / on the sofa / and watch TV together. / they / At night, ................................................................................................................................................... 183. We/ never / in Hanoi. / in summer / wear sweaters ................................................................................................................................................... 184. SU _ MARY 185. Linh can’t go to school today because she has a tooth _ _ _ _ . 186. My younger sister was happy ……………….she got high marks in the exam. A. but B. so C. and D. because 187. ……………………? - He feels tired. A. How do he feel? B. How is he feel? C. How does he feel? D. How he feel? 188. her house is /near the office. / Miss Young goes to /by bike because / work ................................................................................................................................................... 189. him / told / to open / his mouth. / The dentist ................................................................................................................................................... 190. She buys me a hat, _ _ _ a cap. 191. Is your mother an archi _ _ _ _ , Gwen? 192. I can’t watch TV because I have too …………….homework. A. much B. very C. a lot D. many 193. very much. / new / your /I like / bicycle ................................................................................................................................................... 194. Would you _ _ _ _ some noodles? – Yes, please. 195. What do you often do at ni _ _ t? 196. PRIM _ RY 197. _ _ _ _ your father often go fishing? – In the afternoon. 198. We have a _ _ _ _ _ _ when the weather is fine. 199. How many _ _ _ _ _ _ _ _ _ _ do you have on your iPod? (nghe) 200. These letters are _ _ _ _ my friend in Australia. 201. Their children want to go _ _ _ _ _ _ this winter.

Giúp tui với ạ! A= 3/1x4 + 3/4x7 + 3/7x10 +...+ 3/97x100 B= 3/1x3 +3/3x5 + 3/5x7 + .... + 3/99x101 C= 1/4 + 1/28 + 1/70 + ... + 1/10300 D= 1/1x4 +1/4x7 +1/7x10 +...+1/52x55 F= 10 x ( 1/2 + 5/6 + 11/12 + 19/20 +...+ 89/90 )

help me pls I don't have time right now

Ngoài hệ mét thì thực tế người ta còn dùng các đơn vị như Inch, foot, Mile( dặm), năm ánh sáng để đo: A.Thể tích B. Khối lượng C.Lực D.Chiều dài