user-avatar
danieljames123
2 năm trước
Cho hình chóp tam giác đều S.ABC, O là tâm đáy, độ dài cạnh đáy là 3a, độ dài cạnh bên bằng 2acăn3 a) Chứng minh SA vuông góc BC b) Tính góc giữa đường cao và mặt bên Giúp mình ý b) với ạ
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

I. Choose the best answer : 1. Sarah gave up ______ to find a job in this country and decided to go abroad. A. apply B. to apply C. applying D. application 2. Do you want ______ with you or do you want to go alone? A. me coming B. me to come C. that I will come D. that I come 3. I’m sure I locked the door. I clearly remember _____ it. A. locking B. to lock C. to have locked D. to be locked 4. She tried to be serious, but she couldn’t help ______. A. laughing B. to laugh C. that she laughed D. laugh 5. I like _____ the kitchen as often as possible. A. not cleaned B. clean C. to clean D. that I clean 6. He tried to avoid ______ my question. A. answering B. to answer C. answer D. how to answer 7. Could you please stop _______ so much noise? A. to make B. make C. making D. to have make 8. I enjoy ______ to music. A. listen B. to listen C. listening D. listened 9. Have you finished ______ your hair yet? A. wash B. washed C. washing D. to wash 10. Jim is 65, but he isn’t going to retired yet. He wants to carry on _____. A. to work B. work C. works D. working 11. Hello! Fancy _____ you here! What a surprise! A. to see B. seeing C. seen D. see 12. I’ve put off _____ the letters so many times. I really must do it today. A. write B. to write C. written D. writing 13. What a stupid thing to do! Can you imagine anybody _____. A. being B. be C. to be D. were

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