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History, 21.06.2021 01:00 dejaproctor17

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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Cho tam giác ABC có góc  = 90 0 , đường cao AH. Gọi M, N là trung điểm của AB và AC. Chứng minh rằn...
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