Mathematics, 20.06.2021 23:10 lordcaos066
Giải bài toán Cho tam giác ABC có góc  = 90 0 , đường cao AH. Gọi M, N là trung điểm của AB và AC. Chứng minh rằng MH vuông góc với NH.
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Giải bài toán Cho tam giác ABC có góc  = 90 0 , đường cao AH. Gọi M, N là trung điểm của AB và AC....
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