user-avatar
anhhang
2 năm trước
Cho m hỏi, góc giữa hai vecto tính kiểu gì ạ ? ví dụ trong hình lập phương ABCD.A'B'C'D'. yêu cầu tính cos (AB,BA) và cos (AD,AD) thì bằng bao nhiêu vậy
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

VII. Choose the correct answer A, B, C or D to fill each blank in the following passage. I have a very interesting and (61) hobby. I make short video clips with my digital camera. It was my birthday present from my parents last year. Since then, I have (62) three short films. It’s great fun! I started asking my friends and relatives to take (63) in the films. I have tried to write the story for my video clips. When I have finished the script, 1 make copies for the “actors”. Each scene is small and they can look at the words just (64) we start filming. We film at the weekend in my neighbourhood, (65) no one has to travel far. When the video clip is finished, I invite all the “actors” and we watch the film at my house. 61. A. enjoy B. enjoyed C. enjoying D. enjoyable 62. A. done B. played C. made D. watched 63. A. part B. role C. scene D. film 64. A. before B. after C. only D. until 65. A. although B. because C. but D. so

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team