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khonnan1995
2 năm trước
Cho tam giác ABC, M là trung điểm của BC. Trên nửa mặt phẳng ko chứa C có bờ AB vẽ tia Ax vuông góc AB, trên tia lấy điểm D sao cho AD=AB. Trên nửa mp ko chứa B có bờ AC vẽ tia Ay vuông góc AC. Lấy E sao cho AE=AC. CMR: a) AM=DE/2 b) AM vuông góc DE
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