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vohien2242001
2 năm trước
Cho tam giác ABC cân tại A, nội tiếp đường tròn (O). Gọi D là điểm thuộc cung BC không chứa điểm A, E là giao điểm của BC và AD a. Chứng minh góc AEB = góc ABD b. Chứng minh AC mũ 2 = AD. AE
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