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phandinhhunglogan2018
2 năm trước
Cho tam giác nhọn ABC (AB < AC) có ba đường cao AD, BE và CF cắt nhau tại trực tâm H. Gọi M là trung điểm của BC. Qua M kẻ đường thẳng vuông góc với HM, đường thẳng này cắt AB, AD, AC lần lượt tại P, G, Q. Chứng minh rằng: GP = GQ.
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