M.n ơi giúp mình vs, mình đang cần gấp

cho hình bình hành ABCD (A>90).Gọi H và K lần lượt là hình chiếu của A và C lên BD . M là giao của AB với CK ;N là giao của CD với AH chứng minh a) AHCK là hình bình hành b) MN;HK;AC đồng quy vẽ hình nha

2 thanh sắt có thể tích 23cm3, 21 cm3. hỏi 2 thanh sắt năng bao nhiêu gam biết tổng khối lượng của 2 thanh là 275 gam

Em cần gấp ạ ! Ai giải và vẽ hình em sẽ vote 5 sao ạ

Tính : a) $\sqrt{4+\sqrt{8} }$ . $\sqrt{2+\sqrt{2+\sqrt{2}}}$ . $\sqrt{2-\sqrt{2+\sqrt{2} } }$ b) ($\sqrt{10}$ + $\sqrt{6}$ )($\sqrt{15}$ - 4 ).$\sqrt{4+\sqrt{15}}$

Mn giúp mình bài này với hứa vote thank

I. Multiple choice 1. Islamic people usually go to the _______ to pray. A. pagoda B. mosque C. temple D. church 2. People aged 65 over now _______ nearly 20% of the population. A. comprise B. contain C. consist D. combine 3. “How long have you been with the company?” – “I _______ there for three years.” A. will work B. was working C. work D. have worked 4. I wish Beth _______ trying to be so nice. A. would stop B. will stop C. stops D. stop 5. He was so _______ by Cindy’s singing that he asked her to sing on the radio. A. shocked B. impressed C. admiring D. surprised 6. Lucy: “What’s your name?” – Helen: “_______” A. Pardon? B. Really? C. OK. D. Forgive me. 7. What is the _______ cause of the illness? A. primary B. essential C. possibly D. most 8. The new country hopes to establish _______ relations with all its neighbors. A. friend B. friendly C. friendliness D. friendship 9. The book is _______ into ten chapters. A. divided B. formed C. changed D. shared 10. Would you mind _______ the phone number? I could not hear. A. repeat B. to repeat C. repeating D. being repeated 11. Find the word which has a different stress pattern from that of the others. A. peaceful B. atmosphere C. independence D. Buddhism 12. Find the word which has the underlined part pronounced differently from that of the others. A. agreed B. missed C. liked D. watched 13. Find the word which has a different stress pattern from that of the others. A. official B. religion C. Hinduism D. compulsion 14. Find the word which has the underlined part pronounced differently from that of the others. A. Buddhist B. Hinduism C. household D. rehearse

tìm a biết : ax2 + ax3 +2017 = 7012

e) [(- 2, 7) ^ 4] ^ 5 - [(- 2, 7) ^ 2] ^ 10

giải giúp mình với các bạn ơiiiiii