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Mathematics, 28.07.2021 04:10 yeet1570

Cho tam giác AbC ( AB=AC) . Các tia phân giác của góc B, C cắt AB và AC tại E, F. Chứng minh BE=CF. Gọi I là giao điểm của BE và CF . Chứng minh AI là phân giác của góc A

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Cho tam giác AbC ( AB=AC) . Các tia phân giác của góc B, C cắt AB và AC tại E, F. Chứng minh BE=CF....

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