($\frac{1}{6}$+-$\frac{17}{48}$) tính nhanh nhanh nhé

cho mình hỏi là thể tích dung dịch trước và sau phản ứng có bằng nhau không vậy ạ

a) Choose the best answer? Why? 1)A. changed B. learned C. laughed D. listened (gạch chân ed) 2)A. plates B. cakes C. mates D. places (gạch chân es) 3)A. east B. seat C. lead D. great (gạch chân ea) 4)A. fat B. any C. gas D. hat (gạch chân a) 5)She suggested.................to music A) listen B) to listen C) listening D) listened 6)Mary is keen................helping other people A) of B) at C) on D) in 7)Would you like a single room or................room? A) two B) second C) for D) at 8)Because................his laziness he failed the final exam A) of B) in C) for D) at 9)Peter never goes to school late, ................he? A) does B) did C) doesn't D) didn't 10)It’s time we................ the bus. A) catch B) caught C) to catch D) catching b) Choose the the best option to fill in the blanks Christmas is my (1) ………………. holiday. I enjoy (2) ………………. Christmas cookies and planning parties. I sending cards and hearing (3) ………………. old friends. I love seeing children open their (4) ………………. on Christmas morning. Most of all, I love one (5) ………………. custom that we have in our family. On the night before Christmas we (6) ……………….in warm clothing and go from house (7) ………………. house in our neighborhood. At each house, we (8) ………………. Christmas songs. Then we go to a hospital or a home for elderly people and we sing there. We want to let people (9) ………………. that we care about them. Afterward, we come home and drink hot chocolate by the (10) ………………. I love this! 1. A. like B. dislike C. favourite D. love 2. A. bake B. baking C. to bake D. baked 3. A. of B. with C. from D. by 4. A. presents B. gifts C. offers D. both A and B 5. A. special B. unasual C. strange D. rare 6. A. wear B. put on C. dress up D. get 7. A. by B.to C. after D. and 8. A. shout B. cry C. sing D. speak 9. A. know B. to know C. knowing D. knew 10. A. fireworks B. fireplace C. light D. firecrackers

Giúp mình làm với ạ, mình cần gấp (bạn nào giỏi toán giúp mình với ạ)

trung bình cộng của 2 số là 32,55 . biết số thứ nhất gấp 2,5 lần số thứ hai . tìm 2 số đó

a) $\frac{4}{9}$ :(x+0,4)= $\frac{2}{3}$ b)5 ².7 ³.11 ².x+5 ².7 ².11=0 c)5 ².7 ³.11 ².x-5 ².7 ².11^4=0

chứng minh: √(11-4 √7) = √7 -2

(1/16-5/12 cảm ơn,tui ko bt tính

British space scientists are planning to join the American in the race to find evidence of life on (1)_______ planets. Alan Penny and his team at the Rutherford Appleton Laboratory have designed a telescope that is 40 times more powerful than Hubble. Known as 'Darwin', his telescope could tell if planets 50 (2) _______ years away have any kind of life on them. Two days (3) _______, NASA scientists had shown a proof that one of Jupiter's moons could support life; Penny announced that his telescope may be included in a European Space Agency mission. The Darwin project, with a (4)_______ of 500 million, is on a short list of two proposals. If approved it will probably be (5)_______ around 2015, its destination somewhere between Mars and Jupiter. The blueprint is actually for five telescopes positioned 50 meters apart in space, slowly circling a (6)_______ processing station. The combined data from these telescopes would build up a full picture of a planet, picking out faint images that have never been seen before. Darwin would not be able to take detailed photographs of the planets it (7) _______, but Penny believes a second- generation telescope could be sent up to do this. He claims it is worthwhile mapping the universe around our (8) _______ galaxy, even though these planets lie (9)_______ our reach for the moment. The European Space Agency will make its decision (10) ______ Darwin within three years. 1. A. another B. other C. others D. the other 2. A. light B. lighten C. lightening D. lighting 3. A. following B. after C. next D. later 4. A. price B. schedule C. charge D. budget 5. A. driven B. fetched C. launched D. taken 6. A. central B. centre C. middle D. heart 7. A. invents B. searches C. discovers D. looks 8. A. alone B. same C. one D. own 9. A. out B. toward C. beyond D. over 10. A. of B. on C. about D. with

Đun nóng 21.8g chất hữu cơ X với 1 lít dd NaOH 0.5M thu được 24.6g muối của axit đơn chức Y và 1 lượng ancol Z. Nếu cho lượng ancol Z đó bay hơi ở 136.5°C và 1.5 atm, thể tích thu được là 2.24 lít. Lượng NaOH dư được trung hòa bằng 2 lít dd HCl 0.1M. Công thức cấu tạo của X là gì?