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doanduy07102003
2 năm trước
Cho tam giác abc vuông tại A (ab<ac) . Trên cạnh bc lấy điểm m sao cho bm=ba gọi e là trung điểm của AM, k là giao điểm của be và ac Chúng minh tam giác abm = tam giác mbe Chứng minh km vuông góc bc Qua m kẻ đường thẳng song song với ac cắt bk tại f , trên đoạn kc lấy điểm q sao cho kq = mf . Chứng minh abk = qmc Kẻ hình hộ vs nha
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