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Kuquandx2018
2 năm trước
Cho tam giác ABC có góc A=90 độ , AB=9cm, AC=12cm, đường cao AH. a) Tính BC, AH, BH. b) Gọi M là trung điểm của BC, kẻ Mx BC tại M, Mx cắt BA tại D, cắt AC tại E. Chứng minh △BMD đồng dạng với tam giác BAC. c) Tính HM, AD d)Chứng minh BE vuông góc với DC.
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