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hongthamtt2
2 năm trước
Cho (O) kẻ 2 tiếp tuyến AB,AC (A nằm ngoài(O). Một đường thẳng d đi qua A cắt(O) tại 2 điểm E,F sao cho AE<AF và đường thẳng d ko đi qua O. Gọi H là giao điểm của AO và BC Cmr a, tg ABOC nội tiếp , AH.AC=AE.AF b, Gọi K là giao điểm BC và EF . cm $\frac{AK}{AE}$+$\frac{AK}{AF}$=2 Chỉ làm phần b thôi nhé .Hứa sẽ vote5s ctrhn
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