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ntk0101
2 năm trước
Cho tam giác ABC nội tiếp đường tròn (O) đường kính AD. Trung trực BC cắt DB tại K. Đường tròn (K, KC) cắt CA tại E khác C. 1) Chứng minh rằng BE ⊥ AD. 2) Trung trực BC cắt DC tại L. Đường tròn (L, LB) cắt AB tại F khác B. EF cắt BC tại X. M là trung điểm BC. Chứng minh rằng ∠XAB = ∠MAC.
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