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quan2006tv
2 năm trước
Cho tam giác ABC; gọi M là trung điểm của BC. Trên tia đối của tia MA lấy điểm D sao cho MD = MA.a) Chứng minh: Tam giác ABM = Tam giác DCMb) Chứng minh: AB // CDc) Kẻ BH vuông góc AM ( H thuộc AM ), CK vuông góc với DM ( K thuộc DM ), cho biết MK = 1,5cm. Tính độ dài của đoạn thẳng HK
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