đốt cháy 10 gam hỗn hợp khí gồm 1 ankan và 1 anken rồi cho sản phẩm đi qua bình đựng nước vôi trong dư thấy có 70 gam kết tủa tạo thành.mặt khác hỗn hợp trên làm mất màu vừa đủ với 100 ml dung dịch Br2 1M. a) Tìm CTPT,CTCT mỗi hidrocacbon. b) Tính % thể tích,%khối lượng mỗi chất trong hỗn hợp. c) trình bày phương pháp hóa học dùng để nhận biết 2 hợp chất trên.

Words form The Best Medicine If you feel stressed or unhappy, nothing, say researchers, is as therapeutic as laughing. A good, (1. HEART) __________ laugh relieves physical tension and stress, leaving your muscles relaxed for up to 45 minutes afterwards. Not only that, laughing triggers the release of endorphins – the body’s ‘feel-good’ chemicals – so it can provide temporary relief from pain. Laughter even increases infection-fighting antibodies, thus improving your resistance to disease. But the best thing about this (2. PRICE) __________ medicine that has so much power to heal and renew is that it’s fun, free, and available in abundance. One of the best ways to increase the amount of time you spend laughing each day is to hang out with entertaining, (3. MISCHIEF) __________ people. These are people who laugh easily – both at themselves and at life’s absurdities. Laughter is contagious, so just hearing others laugh primes your brain and readies you to smile. What’s more, the ‘feel-good’ emotion you get when you laugh will remain with you long after your laughter (4. SIDE) _________. The ability to laugh easily and frequently is a tremendous resource for (5. COME) __________ problems and improving both physical and emotional health. So, go on! Bring your body and mind back into (6. EQUAL) __________ - laugh!

tìm x,y,z thuộc N* để :3^x+2^y=1+2^z

1. They were enraged at the _______ of a policeman accused of murder. (ACQUIT) 2. The individuality, immediacy and _______ in computer games satisfy the needs from these people. (MIMIC) 3. His cartoons _______ lampooned the leading politicians of his time. (MERCY) 4. We are disappointed by her approaching this matter so _______. (AMATEUR) 5. It was sheer _______ to try to drive through the mountains in that thunderstorm. (SANE)

tìm x,y,z thuộc N* để :3^x+2^y=1+2^z

1. She had a strong desire to be a dancer but failed to make the ______. A. grade B. term C. mark D. degree 2. We ______ deny that we have ever cheated or tampered illegally with any match ball in any game during our careers. A. categorically B. fully C. distinctly D. highly 3. I felt a bit _______ and seemed to have more aches and pains than usual. A. out of sorts C. on the mend B. over the worst D. under the fever 4. A woman who appears to be a __________ person who lives under bridges turns out to be has a metamorphose into a princess and has a regal personage. A. tumble-down B. downcast C. run-down D. down-and-cast 5. Some people can just ______ a cold, but my colds seem to linger for weeks A.shrug off B.cough up C.pull through D.stamp out

ai còn thức hum , giupmkvoi Tìm số dư của phép chia `A = 1^{965} + 2^{965} + .... + 2018^{965}` cho `2021`

Giúp mình với, mình cảm ơn nhiều ạ!

Mn làm giúp e câu 4 và 5 với ạ :((

Một canô xuôi từ bến A đến B cách nhau 40 km sau đó lại ngược trở về A Hãy tính vận tốc riêng của canô biết rằng thời gian canô đi xuôi ít hơn thời gian canô đi ngược là 20 phút vận tốc dòng nước là 3 km và vận tốc riêng của canô không đổi