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queanh123btre
2 năm trước
Cho tam giác ABC có góc BAC bằng 90 độ Trên tia đối của tia AB lấy điểm M sao cho MA = AB a, chứng minh rằng góc Bad bằng góc BAC b, lấy I thuộc AC Chứng minh rằng IB = IM c, lấy G thuộc AC,AG bằng 1/3 AC ,lấy K là trung điểm BC .Chứng minh rằng M,G,k thẳng hàng
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