Từ m gam tinh bột gạo (chứa 19% tạp chất trơ) đem thủy phân rồi lên men rượu với hiệu suất bằng 80%. Toàn bộ lượng CO2 hấp thụ hết vào dung dịch Ca(OH)2 thu được 62 gam kết tủa, lọc kết tủa đem dung dịch đun nóng thu được thêm 50 gam kết tủa nữa. Tìm m ?

Ai giúp mình với mình đg cần gấp cảm ơn nhiều

Giải ngắn gọn nhưng đầy đủ giúp mình nha Cho mạch điện gồm R1 // (R2 nt A2) nt Ampe kế A Biết R1 = 20 ôm A = 4A A2 = 2,2A a) Xác định hiệu điện thế giữa 2 đầu đoạn mạch và giá trị điện trở R2? b) Giữ nguyên hiệu điện thế giữa 2 đầu đoạn mạch, thay R1 = R3 thì thấy ampe kế A chỉ 5,2 A Số chỉ Ampe kế A2 khi đó là bao nhiêu? Tính R3?

làm hộ mik vs ạ ai làm nhanh nhất đúng nhất mik vote 5s vs ctlhn nha

a/rút gọn A=√(1+1/a^2 +1/〖(a+1)〗^2 ) (ĐKXĐ:a>0) b/Tính B=√(1+1/1^2 +1/2^2 ) + √(1+1/2^2 +1/3^2 ) +……+√(1+1/〖99〗^2 +1/〖100〗^2 ) Mình sẽ vote 5* cho câu trả lời chính xác nhất

1) Cmr biểu thức sau ko phụ thuộc vào biến (2x-9).(2x+1)-(4x-3).(x-2)+5(x+3)

làm hộ mik vs ạ ai làm nhanh nhất đúng nhất mik vote 5s vs ctlhn nha

Giúp mik vs mn ơi :3## Do mik lười nha, chứ mik lm đc đó,lm sai nhiều =BC

Giúp em giải bào toán này với ạ

làm phần nào cũng được Choose the one word or phrase - a, b, c, or d - that best completes the sentences. 16. ______ more information, please telephone our main office. a. If you will need b. Should you need c. You should need d. If you needed 17. It's time governments ______ something to limit population growth. a. do b. did c. have done d. will do 18. I'd really like to do accounting. If only I ______ so poor at maths. a. am not b. weren't c. hadn't been d. wouldn't be 19. She wouldn't have gone to university ______. a. if her parents had insisted b. were her parents not insisted c. unless her parents had insisted d. only if her parents hadn't insisted 20. John said if he ______ any money he me a drink. a. has - will buy b. had - would have bought c. has had - would buy d. had had - would have bought 21. If it ______ more humid in the desert of the Southwest, the hot temperature would be unbearable. a. is b. would be c. were d. had been 22. If it keeps on raining, the basketball game ought ______. a. to postpone b. to be postponed c. postpone d. be postponed 23. Only if you get the theater early ______ a chance to get a ticket for tonight's performance. a. you will have b. have c. you have d. will you have 24. If she ______ sick, she would have gone out with me to the party. a. hasn't been b. wasn't c. weren't d. hadn't been 25. ______ been diverted, they would have arrived early. a. Had the plane not b. Hadn't the plane c. The plane had not d. The plane not had C. Identify the one underlined word or phrase - A, B, C or D - that must be changed for the sentence to be correct. 26. Mainly because of the recent health scares involving beef and A B chicken, the number of vegetarians are expected to rise dramatically C D in the next five years. 27. Rita asked me why didn't I ask for my money back if I was unhappy A B C D with my new car. 28. Do you have any view on whether young children should give A B C homework from school? D 29. If Rudy would have studied German in college, he would not have A B found the scientific terminology so difficult to understand. C D 30. The United States has a younger population as most other major A B C industrial countries. D