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ttx159
2 năm trước
Xin phép nói tý : hỏi muốn mắc mệt mà chả ai tl thế :)) đưa 20đ mà trong khi còn có ít điểm hà đấy rui 10đ chắc chả ma nào giải 😞 Cho tam giác ABC. Từ một điểm M bất kì trong tam giác kẻ ME, MD,MF lần lượt vuông góc với các cạnh BC, AC, AB. Chứng minh rằng: BE^2 + CD^2 + AF^2 = CE^2 + AD^2 + BF^2
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