He ... his homework before he went to bed last night A.finished B.finish C.was finished D.had finished

1,chứng minh rằng : x(3+y+1)^2+1 >=3y 2, với x,y là các số thực dương, CMR: 1/a+3b +1/b+3c+1/c+3a>=1/2a+b+c+1/a+2b+c+1/a+b+2c (a,b,c >0)

Vẽ Chibeo hoặc Anime Full line/màu vẽ tradi hoặc digi Cấm chép ạ:>> ưu tiên dân chuyên vẽ:Đ

1. How often he (play) ..... tennis 2. Nam and l (be not) .... doctor 3. Nga (watch) ..... TV 4. Mr Loc (be) ..... a teacher 5. We (not read) ..... books

Vi khuẩn sinh sôi và nảy nở mạnh nhất ở nhiệt độ nào ?

thực hiện phép tính mọi người chỉ giúp em với ạ hứa sẽ vote 5 sao

P= 3a-b/2a+7 + 3b-a/2b-7 (với a khác -3,5; b khác 3,5) tính giá trị của p khi a-b = 7

1. I can’t advise him if he doesn’t tell me more about the situation. I can’t advise him unless_____________________________________________________________ 2. Paola’s father made her sing. Paola was____________________________________________________________________________ 3. “You broke my vase, John”, said his mother angrily. John’s mother accused_________________________________________________________________ 4. These trousers are too small for Kate. These trousers are not__________________________________________________________________ 5. Harry, please don’t smoke here. Harry, would you mind________________________________________________________________? 6. Let’s have a walk in the woods this afternoon. How about__________________________________________________________________________? 7. You must listen carefully to the teacher’s instruction. You must pay________________________________________________________________________ 8. I don’t want to go to the football match tomorrow. I’d rather____________________________________________________________________________ 9. Please ring us on your arrival at the airport. Please ring us as soon as________________________________________________________________ 10. I am sorry I don’t have time to come and help you with your homework. I wish I_______________________________________________________________________

cho 1,344 lít khí CO (đktc) đi qua một ống sứ đựng 1,6g oxit sắt.Sau phản ứng xảy ra hoàn toàn thu được tỉ khối khí hơi so với Fe bằng 9. Xác định CTHH cảu oxit sắt??

giúp mik vs mik cần gấp cso 4 câu thôi ạ