Cho tam giác ABC cân tại A ( góc A nhỏ hơn 90 độ ). Kẻ BD vuông góc AC (D thuộc AC), CE vuông góc AB, (E thuộc AB); BD và CE cắt nhau tại H. Chứng minh: DE song song với BC

các cao nhân ơi Giúp mk vs ạ mk đg cần gấp huhu

Một bạn học sinh được 49/60 điểm , vậy khi quy ước sang thang điểm 10 , bạn ý được bao nhiêu điểm ? ( Giải đầy đủ , nếu ko sẽ báo cáo )

Fill in the blank Our family has got many books. All the .. says that books help us in self-education. In ancient times books were ....(2) by hand. It was difficult to write a book with a pen. Then printing came into our life. Printing played an important role in ..3 development of literature and culture. Now there are a lot of books in the shops, there are many books in our flats. But it is difficult to buy all books which we want to read. That's why we get books in public libraries. There are some problems in our life and sometimes it is difficult ..4 solve them. I think that books can help us. Last year I read a very interesting book " An American Tragedy" by Theodore Dreiser. This novel was published at the beginning of the 20th century. The novel describes the tragic fate of a boy and a girl, Clyde and Roberta by name. It is a sad story. This novel was written many years ago, ...5 it is popular nowadays. Books must be our friends during our life. .(1) of our family huy books and read them. My mother

giúp mink vt đoạn văn trình bày cảm nghĩ của e về hình tượng Bác Hồ trong bài thơ Đêm nay Bác ko ngủ ko chép mạng ạk mink gần ik hc ùi cần gấp

Giúp vs mn ơi ......................................

Exercise 1. Provide the correct form of the verbs in brackets 1/ After her husband (get) home, she started to wash the clothes. 2/ When they reached France, they (visit) 13 countries. 3/ When she (arrive) at his house, she (find) that he (leave) a few minutes before. 4/ Before Mr Ron met me, he (do) nothing. 5/ Yesterday I was sorry that I (hurt) him. 6/ They (tell) her that they (not meet ) her before. 7/ When she (realise) her mistakes, she apologised. 8/ When I (meet) my cousin 2 weeks ago, he told me that he just (return) from the South. 9/ He (give) me back the book, (thank) me for lending it to him and (say) that he (enjoy) it vey much; but I (know) that he (not read) it because most of the pages (be) still uncut. mình cảm ơn trước nhé

Cho hình chữ nhật ABCD có AB>AD. Vẽ AH vuông góc với BD tại H, tia AH cắt CD và đường thẳng BC theo thứ tự I và K. a) Chứng minh tam giác AHB đồng dạng tam giác BCD b) Cm góc BHC = góc BKD

giúp với ạ!!!...................

các bạn giải bài chuyển đổi câu này giúp mình với mình đang cần gấp Mary is glad. She gets good marks -> Mary is glad to............................ The workers clean the streets every day -> The streets.................................... Somebody locks the gates at 6:30 p.m -> The gates.....................................