Mn giúp e với e đng cần gấp, e cảm ơn

oxit của một nguyên tố có CTHH R2Ox phân tử khối là 102đvC oxi chiếm 47,06%. Xác định nguyên tố R

Viết một đoạn văn trình bày cảm nhận của em ngày đầu tiên đến trường 60đ ạ, không mạng( có thể tham khảo sơ qua) , chú ý bộc lộ cảm xúc nhé đừng sa vào kể, biểu cảm phải chiếm phần lớn :< cần trước 6:30 sáng 9/7

cho 200 ml dd h2so4 1m vào 200 ml dd ca(oh)2 a) tính Cm của dd ca(oh)2 b) tính Cm của dd caso4 thu đc sau phản ứng

Giải chi tiết giúp mình bài này nhé! Mình cảm ơn ạ!

Part VIII- Each sentence has a mistake, you find and correct it. 1. Tomorrow they go to London with their family. 2. Last night I dream of a very nice and lovely angel. 3. That is really a biggest apple I've ever seen 4. What's the wrong with you? 5. Peter was coming to visit his teacher when she was having dinner with her family. 6. We're in a diet so we don't like to eat sugary and fat foods. 7. I don't like to eat wine and he doesn't, either. 8. If you want to see her off, to go to the station!

t^t h ko có cj nèo nhận ra tui nx huhuhu vẽ đậu mầm bùn ik ạ

x +2/1.5+2/5.9+....+2/101.105= "-1999" 1/210 giúp

1 tính: a) (-1/3) mũ -1 - (-6/7) mũ 0 + (-1/2) mũ 2 : 2 b) (1000 - 1 mũ 3 ) x ( 100 - 2 mũ 3) x ( 1000 - 3 mũ 3) x...x ( 1000 - 50 mũ 3) c) D= 2021 mũ ( 1000 - 1 mũ 3) x (1000 - 2 mũ 3) x...x( 1000 - 15 mũ 3)

Keeping our teeth healthy Many people nowadays ________(1) wear false teeth when they are middle-aged. Doctors and dentists now __________(2) that sugar is the chief cause of ___________(3) decay. Long ago doctors __________(4) not like to treat people's teeth. Babers and blacksmiths looks _________(5) people'steeth and pulled them ________(6) when they decayed. Some people thought toothache was a punishment from the gods. It is very important to have ________(7) teeth. Good teeth help us to chew our food. They also help us to look nice. How can we keep our teeth healthy? – First, visit our dentist at least twice a year. He can examine our teeth to check that they are good or _________(8) or are growing in the right way. Secondly, brush our teeth with fluoride toothpaste ____________(9) meals and before bedtime. We can also use wooden toothpicks to clean between our teeth after a meal. Thirdly, we should eat food that is good _________(10) our teeth and body: milk, cheese, fish, brown bread, potatoes red rice, raw vegetables and fresh fruit. 1. A. has to B. have to C. having to D. had to 2. A. knows B. knowing C. know D. knew 3. A. tooth B. teeth C. gum D. mouth 4. A. do B. are C. were D. did 5. A. for B. after C. at D. into 6. A. out B. of C. off D. in 7. A. beautiful B. useful C. helpful D. healthy 8. A. nice B. pretty C. bad D. badly 9. A. before B. after C. when D. while 10. A. for B. with C. to D. of