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dangngocsp2qn
2 năm trước
Cho tam giác ABC nội tiếp đường tròn (O). Đường cao AD, BM,CN cắt nhau tại H. a) Chứng minh: BDHN, ACDN là tứ giác nội tiếp. b) Tia BM, CN cắt đường tròn (O) lần lượt tại Q, K.Chứng minh tam giác AKQ là tam giác cân. c) Chứng minh : OA vuông góc với MN d) Chứng minh: Chứng minh : KQ/AH < 2 Giúp mình câu d với ạ! cảm ơn nhìu
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