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baophamtranle
2 năm trước
Cho tứ giác ABCD nội tiếp trong đường tròn. GỌi H,K là hình chiếu của B trên AC,CD, M,N là trung điểm của AD,HK . Chứng minh rằng tam giác MBN là tam giác vuông tại N Ai giải nhanh nhanh giúp ạ
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