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khacdat181881
2 năm trước
Cho đường tròn (O,R) ,đương kính AB cố định .Vẽ tiếp tuyến Ax của (O,R) .Trên Ax lấy điểm M bất kì .Gọi C là giao điểm của đoạn MB với (O,R) ,kẻ AD ⊥MO (D ∈ MO) a) cm tứ giác AMCD nội tiếp
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