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namhuyennguyet
2 năm trước
Cho tam giác vuông ở A, kẻ đường cao AH, phân giác AD ( H, D ∈ BC ). Biết BH = 4cm; HC = 9cm. Gọi M,N lần lượt là hình chiếu của H trên AB, AC. a, Tính giá trị đúng của BD, DC b, Chứng minh: 1/AB + 1/AC = √2 /AD GIẢI NHANH GIÚP MK NHA. MK VOTE 5 SAO VÀ CHO TRẢ LỜI AHY NHẤT
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