Một hình chóp tam giác đều có cạnh bên bằng $b$ và cạnh bên tạo với mặt phẳng đáy một góc $\alpha$. Thể tích của hình chóp là?

1. Do you think diet is important? 2. What is a balanced diet? 3. What is the typical diet of people in your country? 4. Why do some people enjoy eating out? 5. What is the different between restaurant food and home cooked food?

1. I knew that this road (be) to narrow. 2. Right now I (attend) class. 3. When we (arrive) in London toinght, it probably. 4. It (rain) hard. We can do anythin' until it (stop) . 5. the keys of the house (have) been lost. 6. To me , Mathematics (be) somethin' very easy to master. 7. Physics (cause) you any trouble at school. 8. A series of lecures bein' presented at the Central Hall this week. 9. Bread and butter what she asks for . A. is B. are C. will be D. have been 10. The army eliminated this sections of the trainin' test. A. has B. is havin' C. are D. have [CÂU TRẢ LỜI + CÔNG THỨC]

*Jenny took a taxi, but she still arrived late for the interview. A. In spite of Jenny took a taxi, she still arrived late for the interview. B. Although taking a taxi, Jenny still arrived late for the interview. C. Although Jenny took a taxi, she still arrived late for the interview. D. In spite of took a taxi, Jenny still arrived late for the interview. * Although she is intelligent, she doesn't do well at school. A. In spite of intelligent, but she doesn't do well at school. B. Despite being intelligent, she doesn't do well at school. C. Even though her intelligence, she doesn't do well at school. D. In spite the fact that she is intelligent, she doesn't do well at school.

Bài 1. Đọc đoạn văn :“Nàng rót chén rượu đầy…muôn dặm quan san” và thực hiện yêu cầu: 5. Đoạn văn có sử dụng các câu văn biền ngẫu. Tác dụng của các câu văn biền ngẫu ấy ? 6. Hình ảnh ước lệ được sử dụng khá nhiều trong “Chuyện người con gái Nam Xương”. Em hiểu gì về hình ảnh ước lệ ? Tìm các hình ảnh ước lệ được sử dụng trong đoạn văn ? Những hình ảnh ấy có tác dụng gì ?

Mình nghĩ mãi mà ko ra, mọi người giúp mình với

Chứng minh vùng núi đông bắc có nhiều dạng địa hình khác nhau

1. Choose the correct item -dora is crying. She has cut … A.she B.her C.herself -is that …. Book? A.your B.yours C.you -…. William and Thomas enjoy playing cricket A.both B.all C.neither -that’s my pencil. Please give it to … A.i B.my C.me -Sam, Paul and Terry are … in the same class at school A.both B.all C.neither -There’s the shopping. Please put … away in the kitchen A.itself B.its C.it -enjoy … at the party, Beth. Have a good time! A.your B.you C.yourself -…. Rith nor Wendy has got curly hair A.all B.both C.neither -Jelf, Alice and Rosie are all young …. Of the are old A.none B.all C.both

1. Làm tính chia ( x^4 - x^3 - 3x^2 + x + 2 ) : ( x^2 - 1 ) 2. Chứng minh ( 7n -2 )^2 - ( 2n - 7 )^2 luôn luôn chia hết cho 9 với n là mọi giá trị nguyên

differs from the other three in pronunciation in each of the following questions. Question 1. A. boxes B. classes C. finishes D. potatoes Question 2. A. teacher B. champagne C. change D. challenge Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from other three in the position of primary stress in each of the following questions. Question 3. A. discuss B. influence C. airport D. often Question 4. A. apply B. appear C. visit D. attend