user-avatar
thuha17062001hihi
2 năm trước
Cho tg ABC có BC=a, AC=b, AB=c, đường phân giác AD. a) Tính độ dài BD, CD. b) Tia phân giác góc B cắt AD tại I. Tính tỉ số AI:ID. c) Cho BC bằng trung bình cộng của AB và AC, gọi G là trọng tâm của tg ABC. C/m: IG//BC. Ko cần làm câu a đâu ạ cảm ơn mn nhiều ạ.
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

on tv we can see play and films of very kind,(politics) discussion and the latest (excite) football matches the(lose) of forest is destroying the earth's plant variety the police were trying to find out the (true) about him the boys are too lazy to take part in (society) activities the figures have been (complete) checked he loved her and married her , but now he is (happy) you may be (surprise) at the (various) of animals there animals and plants can be protected from the (destroy) influence of human beings mucsic makes a funeral more solemn and (mourn) in the frist two decades of its (exist) , the cinema developed rapidly his second (marry) took place in st.john's church i never feel at (easy) in his company the (attract) of the moon for the earth causes the tides he is (wonder) active in spite of his old age don't say anything that might wound his (proud)

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