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minhphamnhat2001
1 năm trước
Cho tam giác abc vuông tại a (AB<AC)đường trung tuyến AM .Qua M kẻ đường vuông góc với AM cắt AB tại E và cắt AC tại F Kẻ AH vuông góc Với BC (H thuộc BC ) AH cắt EF tại I chứng minh rằng a) Góc BAm = Góc AHM b) góc ACb =góc AEF từ đó suy ra hai tam giác MBE và MFC đồng dạng c) AB.Ai=AC.AF d) S tam giác ABC/ S tam giác AFE =(AM/AI)^2
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