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longtb
2 năm trước
caau1: cho tam giác ABC vuông tại B. kẻ đường trung tuyến AM.trên tia đối của tia MA lấy E sao cho MA=ME.Chứng minh rằng : a, ΔABM= ΔECM b,AB // CE câu 2: cho góc nhọn xOy và M là một điểm thuộc tia phân giác của góc xOy. Kẻ MA vuông góc với Ox . (A ∈ Ox), MB vuông góc với Oy (B ∈ Oy) a,chứng minh : MA=MB b,tam giác OAB là tam giác gì ? vì sao?
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