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Mathematics, 26.07.2021 18:20 kaleyahkay7474

Cho tam giác ABC cân tại A , BD vuộng góc với AC, CE vuông góc với AB, BD và CE cắt nhau tại H a) Chứng minh BD=CE b) tam giác BHC cân c) chứng minh AH là đường trung trực của BC d) Trên BD lấy K sao cho D là trung điểm của BK. So sánh góc ECBvaf góc DKC

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Cho tam giác ABC cân tại A , BD vuộng góc với AC, CE vuông góc với AB, BD và CE cắt nhau tại H a) Ch...
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