Các dân chuyên toán giải hộ mình nhé a)X/2=Y/3=Z/4 và x+y-z=10 b)X/3=Y/12 và 2X-3Y=20

CHO SỐ A=123456 ĐẾN 50515253 BẰNG CÁCH VIẾT LIÊN TIẾP CÁC SỐ TỰ NHIÊN TỪ 1 ĐẾN 53 A HỎI A CÓ BAO NHIÊU CHỮ SỐ B CHỮ SỐ 2 XUẤT HIỆN BAO NHIÊU LẦN CHỮ SỐ THỨ 50 LÀ CHỮ SỐ NÀO 50 ĐIỂM MN NHANH GIÚP MK CÁI

Để làm xong một con đường với 15 người thì phải làm việc trong 16 ngày. Hỏi muốn làm xong con đường đó trong 6 ngày thì cần phải có bao nhiêu người làm? (Biết sức làm việc của mỗi người như nhau.) giúp mik bài này với

Giúp mk (phải có cả cách làm nữa nhé) 1. They are painting the living room at the moment. ->The living room ............................................... 2. John drives more carefully than his brother does. John's brother doesn't ....................................... 3. Learning English is not easy It is .................................................................. 4. They were such difficult questions that we couldn't answer all of them. The questions were so ..... 5. I don't know her phone number, so I can't call her. If I .................................................................. 6. Don't let the children stay up too late. (allowed) -> 7. My sister is not old enough to ride a bicycle. (too) -> 8. She is mean and bad-tempered. (but) -> 9. We had to do a lot of homework at school. (made) -> 10. Although he was ill, he managed to get the job done in time. -> 14. We spent nearly a week making these toys. (took) -> 15. Peter isn't trying to solve his financial problems. (effort) -> 16. The doctor gave him a warning not to smoke because it's dangerous. (warned) -> 17. In her eyes, all her classmates are not trustworthy. (thinks) -> 18. She was grateful to them for their hospitality. (thanked) -> 19. He didn't want to participate in the volunteers' activities. (take) -> 20. They didn't let him get in the disco because he was under 18. (prevented) ->

Giúp mình giải câu này với (Vote 5 stars )

Giải bpt sau : $\frac{1}{3-2x}$ `=0`

a/ Cho 6,5g kẽm tác dụng hết với axit Clohidric HCI. Tính thể tích khí hiđro sinh ra ở đktc? b/ Nếu dùng thể tích khí hiđro này để khử 1.6 sắt (III) trong oxit Fe2O3. Tính khối lượng sắt (III) oxit cần đem phản ứng. giải hộ mik vs

IV. Rewrite the sentences so that they are nearest in meaning to the sentence printed before them. 26 People spent more time communicating with each other in the past. It took 27 He used to write letters to keep in touch with her when he lived far from her. Letters used to 28 How long has that phone been used by our teacher? When 29 How about going on a picnic this weekend? Why don't we 30 "Let's watch a comedy" he said. He suggested V. Choose the correct sentence from the four options a, b, c or d 31 I/ make/ friends/ foreigner/ in/ chat room. a. I made friends with a foreigner in a chat room. b. I am making friends with foreigner in a chat room. c. I was made friends with a foreigner in a chat room. d. I have made friends with foreigner in a chat room. 32 Cultural differences/ can/ seen/ in/ conversation/ between/ people/ different countries. a. Cultural differences can seen in conversation between people to different countries. b. Cultural differences can seen in conversation between people on different countries. c. Cultural differences can be seen in conversation between people from different countries. d. Cultural differences can be seen in conversation between people for different countries. 33 Learn/ English/ help/ us/ get over/ the/ language barriers a. Learn English helps us get over the language barriers. b. Learning English helps us get over the language barriers. c. To Learn English helps us get over the language barriers. d. Learnt English helps us get over the language barriers 34 Have/ you/ ever/ attend/ video conference a. Have you ever attended a video conference? b. Have you ever attending a video conference? c. Have you ever attend a video conference? d. Have you ever attends a video conference? 35 Thanks/ social networks, we/ can/ connect/ each other/ easily. a. Thanks social networks, we can connect to each other easily. b. Thanks social networks, we can to connect to each other easily. c. Thanks to social networks, we can to connect to each other easily. d. Thanks to social networks, we can connect to each other easily 36 My/ cellphone/ parents/ me/ buy/ promised/ a/ to/ I’m/ when/ 18 a. My parents promised to buy me a cellphone when I’m 18 b. My parents promised buy to me a cellphone when I’m 18 c. My parents promised when to buy me a cellphone I’m 18 d. My parents promised to buy a cellphone me when I’m 18 37 My/ landline/ to/ grandfather/ smart phones/ prefers. a. My grandfather prefers to landlines smart phones. b. My grandfather to prefers landlines smart phones. c. My grandfather prefers landlines to smart phones. d. My grandfather prefers smart landlines to phones. 38 Non-verbal/ called/ languages/ are/ languages/ sometimes/ body. a. Non-verbal languages are sometimes called body languages. b. Non-verbal languages are called sometimes body languages. c. Non-verbal are languages sometimes called body languages. d. Non-verbal are languages called sometimes body languages. 39 If/ I/ someone/ send/ will/ her/ I/ a/ love/ send/ snail mail. a. If I send someone, I will love her a snail mail. b. If I send her, I will love someone a snail mail. c. If I love her, I will send someone a snail mail. d. If I love someone, I will send her a snail mail. 40 People/ have/ telepathy/ believe/ twins/ that/ often. a. People have that twins often believe telepathy. b. People believe that twins often have telepathy. c. People twins believe that often have telepathy. d. People believe twins often that have telepathy

Quá trình lên men glucozơ để sản xuất rượu etylic được biểu diễn theo phương trinh hóa học sau: C6H12O6→2C2H5OH+2CO2. Nếu lên men 2160 gam glucozơ thì thể tích khí CO2 ở đktc thải ra môi trường là bao nhiêu ?

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