Tại sao nói Vũ khí thời Nguyễn lại thô sơ và lạc hâu

cho hình chữ nhật abcd. Qua a kẻ đường thẳng vuông góc với bd tại h, cắt dc và bc theo thứ tự tại e và f. a) chứng minh cef đồng dạng hab b) chứng minh ad.de=dh.ae c) biết ab=4cm và bc=3cm. Tính AH

cho tam giác ABC điểm M thuộc cạnh BC sao cho BM/MC = 2/3. Kẻ MH // AC (H thuộc AB), kẻ MK // AC. a) tính MB và MC b) Tính chu vi tam giác ABC biết chu vi tam giác KMC=25cm c)CM: HB.MC=BM.KM ai đó lm ơn giúp tớ vs ạ!! lát phải nộp bài rồi mà mới lm xog 1 bài hic hic

Tìm số hữu tỉ x biết: 5- 1 1/3 nhỏ hơn hoặc bằng x + 1/5 nhỏ hơn hoặc bằng 12 2/7 -3 3/8 ................................

Mn giải giúp em câu này với em cảm ơn ạ

Giúp mình câu 1!!!!!!!!!!!!!!!!

Chu vi hinh chu nhật co chiều dai 9m,chieu rong 35dm la

Rót nước sôi vào ly thủy tinh,ly dày hay mỏng dễ vỡ hơn? Vì sao ? Nêu cách khắc phục

GERUND & INFINITIVE 1. Tourist could see fish (swim) ________ along the brook. 2. Let me (pay) ________ for the meal. You paid last time. 3. The form teacher has asked Jack (write) _________ an essay on the Thames. 4. It sometimes may be difficult (get) ________ a taxi during rush- hours. 5. The rain has made the children (stop) _______ their game. 6. She tells the driver (take) ________ her to the railway station. 7. Does Mrs Green have them (carry) _________ those books back home? 8. The principal noticed those pupils (try) _________ harder and harder. 9. Children have just stopped (play) _________ football. 10. They keep (talk) _______ about an old friend they met yesterday. 11. Is Black Pool (visit) ________ by thousands of tourists each year? 12. We heard Mr Brown (park) ________ his car near the gate. 13. They've finished (do) _________ their homework. 14. He had their house (paint) _______ before Tet holiday. 15. I advised him (wait) _______ for me at the airport. 16. Would you mind (help) _______ me with this work? 17. Do you smell something (burn) _______ in the kitchen? 18. Mother requests her daughter not (come) _______ back home late. 19. We shall have the grass (cut) _________ tomorrow. 20. They noticed lots of sheep (graze) _______ in green meadows. 21. Can you help me (get) ________ the diner ready? 22. Would you like (have) __________ something to eat? 23. It starten (rain) ________ an hour ago. Has it stopped (rain) ______ yet? 24. My family is trying (decide) ________ where to go on holiday. 25. Our teacher made me (answer) ________ all the questions. 26. I've enjoy (meet) _________ you. I hope (see) ________ you again. 27. I hate (see) ______ a child (cry) __________. 28. They refuse (go) __________ out on trips if it's too hot. 29. I used (smoke) ________ 20 cigarettes a day, but now I give up (smoke) _________. 30. We decide (rent) __________ a house with a swimming pool.

Giúp e bài này vs ạ!!! ;((( Bài ?2 ấy ạ