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Coldly
2 năm trước
Cho tam giác đều ABC cạnh a, M là trung điểm của BC. Trên cạnh AB lấy điểm D, trên cạnh AC lấy điểm E sao cho góc DME = 60°. a) Chứng minh BD.CE = a^2/4 b) Chứng minh tam giác MBD đồng dạng tam giác EMD và tam giác ECM đồng dạng tam giác EMD. c) Tính khoảng cách từ điểm M đến đường thẳng DE. Giúp mình zớiiiiiiiiiiii ạ
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