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Nguyenthikimchi
2 năm trước
Cho nửa đường tròn (O) đường kính AB= 2R, dây cung AC. Gọi M là điểmchính giữa cung AC. Đường thẳng kẻ từ C song song với BM cắt tia AM ở K và cắt tiaOM ở D. OD cắt AC tại H. Chứng minh tứ giác CKMH nội tiếp.
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