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thanh7553
2 năm trước
Cho tam giác abc cân tại a . M là trung điêm cảu bc. me vuông góc với ab , mf vuông góc với ac. a< Tam giác bem =cfm b, am là trung trực của ef c,từ B kẻ đường thẳng vuông góc với ab tại b, từ c kẻ đường vuông góc ac . hai đường này cắt nhau tại d, chứng minh a, m , d thẳng hàng giúp mình vs
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